1
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Kuroki K, Ito T, Takaya J. Reversible Boron-Insertion into Aromatic C-C Bonds. Angew Chem Int Ed Engl 2023; 62:e202312980. [PMID: 37735101 DOI: 10.1002/anie.202312980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2023] [Revised: 09/20/2023] [Accepted: 09/21/2023] [Indexed: 09/23/2023]
Abstract
Formation of borabicyclo[3.2.0]heptadiene derivatives was achieved via boron-insertion into aromatic C-C bonds in the photo-promoted skeletal rearrangement reaction of triarylboranes bearing an ortho-phosphino substituent (ambiphilic phosphine-boranes). The borabicyclo[3.2.0]heptadiene derivatives were fully characterized by NMR and X-ray analyses. The dearomatized products were demonstrated to undergo the reverse reaction in the dark at room temperature, realizing photochemical and thermal interconversion between triarylboranes and boron-doped bicyclic systems. Experimental and theoretical studies revealed that sequential two electrocyclic reactions involving E/Z-isomerization of an alkene moiety proceed via a highly strained trans-borepin intermediate.
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Affiliation(s)
- Kaito Kuroki
- Department of Chemistry, School of Science, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Tatsuyoshi Ito
- Department of Chemistry, School of Science, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
| | - Jun Takaya
- Department of Chemistry, School of Science, Tokyo Institute of Technology O-okayama, Meguro-ku, Tokyo, 152-8551, Japan
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2
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Li Y, Shen YH, Esper AM, Tidwell JR, Veige AS, Martin CD. Probing borafluorene B-C bond insertion with gold acetylide and azide. Dalton Trans 2023; 52:668-674. [PMID: 36537567 DOI: 10.1039/d2dt03672j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The reaction of Ph3PAuN3 with 9-Ph-9-borafluorene resulted in complexation of the azide to boron while a gold acetylide reacted with 9-Ph-9-borafluorene to insert the acetylide carbon to access a six-membered boracycle with an exocyclic double bond.
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Affiliation(s)
- Yijie Li
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA.
| | - Yu-Hsuan Shen
- University of Florida, Department of Chemistry, Center for Catalysis, Gainesville, FL 32611, USA
| | - Alec M Esper
- University of Florida, Department of Chemistry, Center for Catalysis, Gainesville, FL 32611, USA
| | - John R Tidwell
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA.
| | - Adam S Veige
- University of Florida, Department of Chemistry, Center for Catalysis, Gainesville, FL 32611, USA
| | - Caleb D Martin
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA.
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3
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Golfmann M, Sindlinger CP. Assessing an Elusive 3,4‐Dimethyl‐Chloroborole. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Maxim Golfmann
- Institut für Anorganische Chemie Georg-August Universität Göttingen Tammannstr. 4 37077 Göttingen Germany
- Present address: Institut für Organische und Biomolekulare Chemie Georg-August Universität Göttingen Tammannstr. 2 37077 Göttingen Germany
| | - Christian P. Sindlinger
- Institut für Anorganische Chemie RWTH Aachen University Landoltweg 1a D-52074 Aachen Germany
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4
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Wohltmann WM, Schmidtmann M, Müller T. Covalent triflates as synthons for silolyl- and germolyl cations. Dalton Trans 2022; 51:9836-9842. [PMID: 35708108 DOI: 10.1039/d2dt01446g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of 1-silolyl and 1-germolyl triflates from the corresponding chlorides by salt metathesis reaction is reported. These covalent triflates are ideal starting materials for the preparation of ionic silolyl- and germolyl-imidazolium triflates by their reaction with N-heterocyclic carbenes. Similarily, ionic silolyl- and germolyl-oxophosphonium triflates are obtained by substitution of the triflate group by triethylphosphane oxide Et3PO. The analysis of their 31P NMR chemical shifts according to the Gutmann-Beckett method reveal the high Lewis acidity of the underlying silolyl and germolyl cations. Further analysis of structural and NMR parameters of the silolyl- and germolyl-imidazolium and oxophosphonium triflates indicates that these compounds are covalently bonded silole and germole derivatives with insignificant contributions from silolyl- or germolyl cations. Silolyl and germolyl triflates are however synthetic equivalents of these cations and might serve as a source for electrophilic silolyl and germolyl units.
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Affiliation(s)
- Wiebke Marie Wohltmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129 Oldenburg, Germany.
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129 Oldenburg, Germany.
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129 Oldenburg, Germany.
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5
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Shoji Y, Kashida J, Fukushima T. Bringing out the potential of organoboron compounds by designing the chemical bonds and spaces around boron. Chem Commun (Camb) 2022; 58:4420-4434. [DOI: 10.1039/d2cc00653g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Since the structures, reactivity and properties of organoboron compounds stem from the electron deficiency and low electronegativity of boron, the design of the chemical bonds attached to boron as well...
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6
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Bischof T, Guo X, Krummenacher I, Beßler L, Lin Z, Finze M, Braunschweig H. Alkene insertion reactivity of a o-carboranyl-substituted 9-borafluorene. Chem Sci 2022; 13:7492-7497. [PMID: 35872816 PMCID: PMC9244080 DOI: 10.1039/d2sc02750j] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Accepted: 06/01/2022] [Indexed: 11/24/2022] Open
Abstract
The synthesis of 9-borafluorene with an electron-withdrawing o-carboranyl substituent and its reactions with a series of alkenes are described. The o-carboranyl substituent is bonded via one of the cluster carbon atoms to the boron atom of the 9-borafluorene moiety. In all cases, the reactions afford partly saturated analogs of borepins (i.e. 6,7-dihydroborepins) by unprecedented alkene insertion into the endocyclic B–C bond of the borole ring. Comparative studies with 9-bromo-9-borafluorene illustrate the superior insertion reactivity of the carboranyl-substituted derivative. A suite of experimental and computational techniques disclose the unique properties of the 9-borafluorene and provide insight into how the 9-carboranyl substituent affects its chemical reactivity. A 9-carboranyl-substituted 9-borafluorene is reported, which is capable of undergoing efficient ring expansion to 6,7-dihydroborepins by a previously unknown alkene insertion.![]()
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Affiliation(s)
- Tobias Bischof
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Xueying Guo
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Lukas Beßler
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
| | - Maik Finze
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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7
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Lindl F, Guo X, Krummenacher I, Rauch F, Rempel A, Paprocki V, Dellermann T, Stennett TE, Lamprecht A, Brückner T, Radacki K, Bélanger-Chabot G, Marder TB, Lin Z, Braunschweig H. Rethinking Borole Cycloaddition Reactivity. Chemistry 2021; 27:11226-11233. [PMID: 34008250 PMCID: PMC8453799 DOI: 10.1002/chem.202101290] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Indexed: 11/11/2022]
Abstract
Boroles are attracting broad interest for their myriad and diverse applications, including in synthesis, small molecule activation and functional materials. Their properties and reactivity are closely linked to the cyclic conjugated diene system, which has been shown to participate in cycloaddition reactions, such as the Diels‐Alder reaction with alkynes. The reaction steps leading to boranorbornadienes, borepins and tricyclic boracyclohexenes from the thermal reaction of boroles with alkynes are seemingly well understood as judged from the literature. Herein, we question the long‐established mechanistic picture of pericyclic rearrangements by demonstrating that seven‐membered borepins (i. e., heptaphenylborepin and two derivatives substituted with a thienyl and chloride substituent on boron) exist in a dynamic equilibrium with the corresponding bicyclic boranorbornadienes, the direct Diels‐Alder products, but are not isolable products from the reactions. Heating gradually converts the isomeric mixtures into fluorescent tricyclic boracyclohexenes, the most stable isomers in the series. Results from mechanistic DFT calculations reveal that the tricyclic compounds derive from the boranorbornadienes and not the borepins, which were previously believed to be intermediates in purely pericyclic processes.
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Affiliation(s)
- Felix Lindl
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Xueying Guo
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Florian Rauch
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Anna Rempel
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Valerie Paprocki
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Theresa Dellermann
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Tom E Stennett
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Anna Lamprecht
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Tobias Brückner
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Krzysztof Radacki
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Guillaume Bélanger-Chabot
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Todd B Marder
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P. R. China
| | - Holger Braunschweig
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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8
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Heitkemper T, Sarcevic J, Sindlinger CP. A Neutral Silicon(II) Half-Sandwich Compound. J Am Chem Soc 2020; 142:21304-21309. [PMID: 33315393 DOI: 10.1021/jacs.0c11904] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metathesis reaction of a dilithio borole dianion, a cyclic π-ligand isoelectronic to ubiquitous cyclopentadienyls, with two equivalents of "silicocenium" cation [Cp*Si]+ as a source of low-valent Si(II), cleanly gives a borole half-sandwich π-complex of Si(II) and silicocene. The resulting half-sandwich complex is a neutral isoelectronic analogue to the iconic silicocenium cation and features the rare structural motif of an apical silicon(II) atom with an energetically high lying lone pair of electrons that is shown to be accessible for coordination chemistry toward tungsten carbonyl. Protonation at the Si(II) atom with [H(OEt2)2][Al{OC(CF3)3}4] induces formal oxidation, and the compound rearranges to incorporate the Si atom into the carbocyclic base to give an unprecedented cationic 5-sila-6-borabicyclo[2.1.1]hex-2-ene. This rearrangement is accompanied by drastic changes in the 11B and 29Si NMR chemical shifts.
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Affiliation(s)
- Tobias Heitkemper
- Institut für Anorganische Chemie, Georg-August Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Julijan Sarcevic
- Institut für Anorganische Chemie, Georg-August Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Christian P Sindlinger
- Institut für Anorganische Chemie, Georg-August Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
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9
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Guo X, Yang T, Lin Z. Understanding the Diverse Reactivity of Pentaphenylborole toward Epoxides. J Org Chem 2020; 85:14139-14148. [PMID: 33085482 DOI: 10.1021/acs.joc.0c02200] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Density functional theory calculations have been performed to study the diverse reactivity of pentaphenylborole toward different epoxides. We systematically investigated the effect of substituents on epoxides for the preference/competition of three experimentally observed pathways, that is, intramolecular proton transfer, direct ring expansion via insertion of one epoxide molecule, and ring expansion via insertion of two epoxide molecules. Our calculations also predicted a high competitivity between the proton transfer and direct ring expansion pathways for the epoxide containing both alkyl and aryl substituents.
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Affiliation(s)
- Xueying Guo
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, People's Republic of China
| | - Tilong Yang
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, People's Republic of China
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong 999077, People's Republic of China
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10
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Abstract
This work describes the synthesis and characterization of a highly reactive cationic borole. Halide abstraction with Li{Al[OC(CF3 )3 ]4 } from the NHC-chloroborole adduct yields the first stable NHC-supported 1-(Me NHC)-2,5-(SiMe3 )2 -3,4-(Ph*)2 -borole cation. Electronically, it features both a five-membered cyclic conjugated 4 π-electron system and a cationic charge and thus resembles the yet elusive cyclopentadienyl cation. The borole cation was characterized crystallographically, spectroscopically (NMR, UV/Vis), by cyclovoltammetry, microanalysis and mass-spectrometry and its electronic structure was probed computationally. The cation reacts with tolane and reversibly binds carbon monoxide. Direct comparison with the structurally related, yet neutral, 1-mesityl borole reveals strong Lewis acidity, reduced HOMO-LUMO gaps, and increased anti-aromatic character.
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Affiliation(s)
- Tobias Heitkemper
- Institut für Anorganische ChemieGeorg-August-Universität GöttingenTammannstr. 437077GöttingenGermany
| | - Christian P. Sindlinger
- Institut für Anorganische ChemieGeorg-August-Universität GöttingenTammannstr. 437077GöttingenGermany
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11
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Thiess T, Bélanger‐Chabot G, Fantuzzi F, Michel M, Ernst M, Engels B, Braunschweig H. Diborane(4) Azides: Surprisingly Stable Sources of Transient Iminoboranes. Angew Chem Int Ed Engl 2020; 59:15480-15486. [PMID: 32270577 PMCID: PMC7497274 DOI: 10.1002/anie.202003050] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/06/2020] [Indexed: 01/30/2023]
Abstract
Herein we describe the first examples of isolable electron-precise diboranes(4) that bear azide moieties: the acyclic 1,2-diazido-1,2-bis(dimethylamino)diborane(4) and the cyclic 1,4-diaryl-2,3-diazido-1,4-diaza-2,3-diborinines (aryl=mesityl, 2,6-xylyl, 4-tolyl). The reported examples are not only stable enough to be observed and isolated (putative transient diborane(4) azides previously reported by our group spontaneously decompose even below room temperature), but some of them are even robust enough to undergo controlled pyrolysis without explosive decomposition at temperatures well above 100 °C. In two cases, the controlled pyrolysis allows the isolation of complex diazaboretidines, which are the apparent dimerization products of endocyclic boryl-iminoboranes.
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Affiliation(s)
- Torsten Thiess
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Guillaume Bélanger‐Chabot
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Département de ChimieUniversité Laval1045 Avenue de la MédecineQuébecG1V 0A6Canada
| | - Felipe Fantuzzi
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Physical and Theoretical ChemistryJulius-Maximilians-Universität WürzburgEmil-Fischer-Straße 4297074WürzburgGermany
| | - Maximilian Michel
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Moritz Ernst
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Bernd Engels
- Institute for Physical and Theoretical ChemistryJulius-Maximilians-Universität WürzburgEmil-Fischer-Straße 4297074WürzburgGermany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
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12
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Ito T, Iwasawa N, Takaya J. Photo‐promoted Skeletal Rearrangement of Phosphine–Borane Frustrated Lewis Pairs Involving Cleavage of Unstrained C−C σ‐Bonds. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004444] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tatsuyoshi Ito
- Department of Chemistry School of Science Tokyo Institute of Technology O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Nobuharu Iwasawa
- Department of Chemistry School of Science Tokyo Institute of Technology O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Jun Takaya
- Department of Chemistry School of Science Tokyo Institute of Technology O-okayama, Meguro-ku Tokyo 152-8551 Japan
- JST PRESTO Honcho Kawaguchi Saitama 332-0012 Japan
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13
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Leitl J, Jupp AR, Habraken ERM, Streitferdt V, Coburger P, Scott DJ, Gschwind RM, Müller C, Slootweg JC, Wolf R. A Phosphinine-Derived 1-Phospha-7-Bora-Norbornadiene: Frustrated Lewis Pair Type Activation of Triple Bonds. Chemistry 2020; 26:7788-7800. [PMID: 32052879 PMCID: PMC7383905 DOI: 10.1002/chem.202000266] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/12/2020] [Indexed: 02/06/2023]
Abstract
Salt metathesis of 1-methyl-2,4,6-triphenylphosphacyclohexadienyl lithium and chlorobis(pentafluorophenyl)borane affords a 1-phospha-7-bora-norbornadiene derivative 2. The C≡N triple bonds of nitriles insert into the P-B bond of 2 with concomitant C-B bond cleavage, whereas the C≡C bonds of phenylacetylenes react with 2 to form λ4 -phosphabarrelenes. Even though 2 must formally be regarded as a classical Lewis adduct, the C≡N and C≡C activation processes observed (and the mild conditions under which they occur) are reminiscent of the reactivity of frustrated Lewis pairs. Indeed, NMR and computational studies give insight into the mechanism of the reactions and reveal the labile nature of the phosphorus-boron bond in 2, which is also suggested by detailed NMR spectroscopic studies on this compound. Nitrile insertion is thus preceded by ring opening of the bicycle of 2 through P-B bond splitting with a low energy barrier. By contrast, the reaction with alkynes involves formation of a reactive zwitterionic methylphosphininium borate intermediate, which readily undergoes alkyne 1,4-addition.
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Affiliation(s)
- Julia Leitl
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Andrew R. Jupp
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 904, PO Box 941571090 GDAmsterdamThe Netherlands
| | - Evi R. M. Habraken
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 904, PO Box 941571090 GDAmsterdamThe Netherlands
| | - Verena Streitferdt
- Institute of Organic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Peter Coburger
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Daniel J. Scott
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Ruth M. Gschwind
- Institute of Organic ChemistryUniversity of Regensburg93040RegensburgGermany
| | - Christian Müller
- Institute of Chemistry and BiochemistryFreie Universität BerlinFabeckstr. 34/3614195BerlinGermany
| | - J. Chris Slootweg
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 904, PO Box 941571090 GDAmsterdamThe Netherlands
| | - Robert Wolf
- Institute of Inorganic ChemistryUniversity of Regensburg93040RegensburgGermany
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14
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Bismuto A, Nichol GS, Duarte F, Cowley MJ, Thomas SP. Characterization of the Zwitterionic Intermediate in 1,1-Carboboration of Alkynes. Angew Chem Int Ed Engl 2020; 59:12731-12735. [PMID: 32343867 DOI: 10.1002/anie.202003468] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Indexed: 11/12/2022]
Abstract
The reaction of a Lewis acidic borane with an alkyne is a key step in a diverse range of main group transformations. Alkyne 1,1-carboboration, the Wrackmeyer reaction, is an archetypal transformation of this kind. 1,1-Carboboration has been proposed to proceed through a zwitterionic intermediate. We report the isolation and spectroscopic, structural and computational characterization of the zwitterionic intermediates generated by reaction of B(C6 F5 )3 with alkynes. The stepwise reactivity of the zwitterion provides new mechanistic insight for 1,1-carboboration and wider B(C6 F5 )3 catalysis. Making use of intramolecular stabilization by a ferrocene substituent, we have characterized the zwitterionic intermediate in the solid state and diverted reactivity towards alkyne cyclotrimerization.
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Affiliation(s)
- Alessandro Bismuto
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Gary S Nichol
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Fernanda Duarte
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Michael J Cowley
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Stephen P Thomas
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK
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15
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Bismuto A, Nichol GS, Duarte F, Cowley MJ, Thomas SP. Characterization of the Zwitterionic Intermediate in 1,1‐Carboboration of Alkynes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003468] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Alessandro Bismuto
- EaStCHEM School of Chemistry University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
| | - Gary S. Nichol
- EaStCHEM School of Chemistry University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
| | - Fernanda Duarte
- Chemistry Research Laboratory University of Oxford 12 Mansfield Road Oxford OX1 3TA UK
| | - Michael J. Cowley
- EaStCHEM School of Chemistry University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
| | - Stephen P. Thomas
- EaStCHEM School of Chemistry University of Edinburgh Joseph Black Building David Brewster Road Edinburgh EH9 3FJ UK
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16
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Thiess T, Bélanger‐Chabot G, Fantuzzi F, Michel M, Ernst M, Engels B, Braunschweig H. Diboran(4)azide als stabile Quelle für kurzlebige Iminoborane. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202003050] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Torsten Thiess
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor als Schlüsselelement Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Guillaume Bélanger‐Chabot
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor als Schlüsselelement Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Département de Chimie Université Laval 1045 Avenue de la Médecine Québec G1V 0A6 Kanada
| | - Felipe Fantuzzi
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor als Schlüsselelement Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institut für Physikalische und Theoretische Chemie Julius-Maximilians-Universität Würzburg Emil-Fischer-Straße 42 97074 Würzburg Deutschland
| | - Maximilian Michel
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor als Schlüsselelement Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Moritz Ernst
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor als Schlüsselelement Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Bernd Engels
- Institut für Physikalische und Theoretische Chemie Julius-Maximilians-Universität Würzburg Emil-Fischer-Straße 42 97074 Würzburg Deutschland
| | - Holger Braunschweig
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor als Schlüsselelement Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
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17
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Ito T, Iwasawa N, Takaya J. Photo‐promoted Skeletal Rearrangement of Phosphine–Borane Frustrated Lewis Pairs Involving Cleavage of Unstrained C−C σ‐Bonds. Angew Chem Int Ed Engl 2020; 59:11913-11917. [DOI: 10.1002/anie.202004444] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Indexed: 12/25/2022]
Affiliation(s)
- Tatsuyoshi Ito
- Department of Chemistry School of Science Tokyo Institute of Technology O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Nobuharu Iwasawa
- Department of Chemistry School of Science Tokyo Institute of Technology O-okayama, Meguro-ku Tokyo 152-8551 Japan
| | - Jun Takaya
- Department of Chemistry School of Science Tokyo Institute of Technology O-okayama, Meguro-ku Tokyo 152-8551 Japan
- JST PRESTO Honcho Kawaguchi Saitama 332-0012 Japan
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18
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Drescher R, Lin S, Hofmann A, Lenczyk C, Kachel S, Krummenacher I, Lin Z, Braunschweig H. Ring expansion of alumoles with organic azides: selective formation of six-membered aluminum-nitrogen heterocycles. Chem Sci 2020; 11:5559-5564. [PMID: 32874499 PMCID: PMC7444475 DOI: 10.1039/d0sc02032j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Accepted: 05/13/2020] [Indexed: 11/27/2022] Open
Abstract
A cyclopentadienyl-substituted alumole is shown to undergo ring expansions with a series of organic azides, affording 1,2-azaaluminabenzenes either with or without an azo group.
Aside from simple Lewis acid–base chemistry, the reaction chemistry of aluminacyclopentadienes, which are commonly referred to as aluminoles or simply alumoles, remains relatively underdeveloped. To date, few attempts to extend their inherent insertion and cycloaddition reactivity to the construction of stable aluminum-containing heterocycles have been reported. Herein, we demonstrate the selective ring expansion of a cyclopentadienyl-substituted alumole with a series of organic azides to form unsaturated six-membered AlN heterocycles. Depending on the substituent on the azide, the reaction proceeds either with or without loss of dinitrogen, leading to incorporation of only the “NR” unit of the azide or the entire azo substituent into the periphery of the heterocycle. A deeper understanding of these ring expansion reactions is reached through computational studies, illustrating deviations in the mechanism as a function of the organic azide employed.
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Affiliation(s)
- Regina Drescher
- Institute for Inorganic Chemistry , Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany .
| | - Shujuan Lin
- Department of Chemistry , The Hong Kong University of Science and Technology , Clear Water Bay , Kowloon , Hong Kong , China .
| | - Alexander Hofmann
- Institute for Inorganic Chemistry , Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany .
| | - Carsten Lenczyk
- Institute for Inorganic Chemistry , Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany .
| | - Stephanie Kachel
- Institute for Inorganic Chemistry , Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany .
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry , Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany .
| | - Zhenyang Lin
- Department of Chemistry , The Hong Kong University of Science and Technology , Clear Water Bay , Kowloon , Hong Kong , China .
| | - Holger Braunschweig
- Institute for Inorganic Chemistry , Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany .
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19
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Shoji Y, Kashida J, Fukushima T. Organic Transformations Using Electron-Deficient Boron Compounds. J SYN ORG CHEM JPN 2020. [DOI: 10.5059/yukigoseikyokaishi.78.190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yoshiaki Shoji
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research, Tokyo Institute of Technology
| | | | - Takanori Fukushima
- Laboratory for Chemistry and Life Science (CLS), Institute of Innovative Research, Tokyo Institute of Technology
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20
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Deng B, Wang X, Wang S. Dearomatizing and Derivatizing a Mesityl Group on Boron by One-Pot Photoisomerization and [4+2] Diels-Alder Addition. Chemistry 2019; 25:14694-14700. [PMID: 31486136 DOI: 10.1002/chem.201903534] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Indexed: 12/13/2022]
Abstract
Boron compounds having a conjugated chelate backbone (N,C-chelate or C,C-chelate) and two mesityl substituents on boron have been found to undergo a facile one-pot transformation/reaction with dienophiles, which leads to the dearomatization of one mesityl ring and its [4+2] Diels-Alder addition with the dienophile. Photochemical activation is the key in this transformation of the aryl ring.
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Affiliation(s)
- Billy Deng
- Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - Xiang Wang
- Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada
| | - Suning Wang
- Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6, Canada
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21
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Omori H, Shinokubo H. Ni(II) 10-Boracorrole: An Antiaromatic Porphyrinoid Containing a Boron Atom at the meso-Position. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00303] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Hiroto Omori
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
| | - Hiroshi Shinokubo
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan
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22
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Heitkemper T, Sindlinger CP. Electronic Push-Pull Modulation by Peripheral Substituents in Pentaaryl Boroles. Chemistry 2019; 25:6628-6637. [PMID: 30861220 DOI: 10.1002/chem.201900826] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 03/07/2019] [Indexed: 11/06/2022]
Abstract
Establishing access to a bulky tetraaryl dilithiobutadiene (Ph*C)4 Li2 (Ph*=3,5-tBu2 (C6 H3 )) allowed for the synthesis of five-membered heterocycles with incorporated main-group elements. Along with an amino borole, a set of substituted pentaaryl boroles (Ph*C)4 BAr has been synthesized. The examination of their absorption spectra and computational studies by means of DFT granted insight into the influence of peripheral substituents on the electronic features of the parent pentaphenyl borole (PhC)4 BPh. Introduction of the more electron-rich Ph* residue at the carbon atoms increases the HOMO energy, redshifting the visible π/π*-absorption bands compared with the parent pentaphenyl borole. The influence on the frontier orbitals of three different boron-bound aryls with electronically modulating substituents in the remote 3,5-positions Ar=3,5-R2 -C6 H3 (R=Me, H, CF3 ) was studied. The substituents were found to increase (+I effect, Me) or decrease (-I effect, CF3 ) the LUMO energy, thus directly affecting the visible absorption spectra. This represents the first study on HOMO-LUMO-gap adjustments by a combined push-pull approach of a substituted pentaphenylborole.
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Affiliation(s)
- Tobias Heitkemper
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany
| | - Christian P Sindlinger
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077, Göttingen, Germany
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23
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Politanskaya LV, Selivanova GA, Panteleeva EV, Tretyakov EV, Platonov VE, Nikul’shin PV, Vinogradov AS, Zonov YV, Karpov VM, Mezhenkova TV, Vasilyev AV, Koldobskii AB, Shilova OS, Morozova SM, Burgart YV, Shchegolkov EV, Saloutin VI, Sokolov VB, Aksinenko AY, Nenajdenko VG, Moskalik MY, Astakhova VV, Shainyan BA, Tabolin AA, Ioffe SL, Muzalevskiy VM, Balenkova ES, Shastin AV, Tyutyunov AA, Boiko VE, Igumnov SM, Dilman AD, Adonin NY, Bardin VV, Masoud SM, Vorobyeva DV, Osipov SN, Nosova EV, Lipunova GN, Charushin VN, Prima DO, Makarov AG, Zibarev AV, Trofimov BA, Sobenina LN, Belyaeva KV, Sosnovskikh VY, Obydennov DL, Usachev SA. Organofluorine chemistry: promising growth areas and challenges. RUSSIAN CHEMICAL REVIEWS 2019. [DOI: 10.1070/rcr4871] [Citation(s) in RCA: 94] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Essex LA, Taylor JW, Harman WH. Nickel complexes of phosphine-appended benzannulated boron heterocycles. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.02.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Baker JJ, Al Furaiji KHM, Liyanage OT, Wilson DJD, Dutton JL, Martin CD. Diverse Reactivity of Dienes with Pentaphenylborole and 1-Phenyl-2,3,4,5-Tetramethylborole Dimer. Chemistry 2019; 25:1581-1587. [PMID: 30457687 DOI: 10.1002/chem.201805151] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/13/2018] [Indexed: 12/14/2022]
Abstract
The reactions of a monomeric borole and a dimeric borole with 2,3-dimethyl-1,3-butadiene and 1,3-cyclohexadiene were investigated. The monomeric borole reacted at ambient temperature whereas heat was required to crack the dimer to form the monomer and induce reactivity. 2,3-Dimethyl-1,3-butadiene reacts to give diverse products resulting from a cycloaddition process with the B-C moiety of the boroles acting as a dienophile, followed by rearrangements to furnish bicyclic species. For 1,3-cyclohexadiene, a [4+2] process is observed in which 1,3-cyclohexadiene serves as the dienophile and the boroles as the diene partner. The experimental results are corroborated with mechanistic theoretical calculations that indicate boroles can serve as either a diene or dienophile in cycloaddition reactions with dienes.
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Affiliation(s)
- J J Baker
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - Khadilah H M Al Furaiji
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - O Tara Liyanage
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - David J D Wilson
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - Jason L Dutton
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - Caleb D Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
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26
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Abstract
Most of the chemical and biological processes involving the fixation and transformation of small molecules have long been exclusive for metal complexes. Meanwhile, the last decades have seen a significant advance in main group chemistry that mimics transition-metal complexes, among which various boron-containing systems have been successful in mediating the small molecule activation. In this review, we focus on boron-containing heterocycles enabling the activation of σ- and π-bonds in small molecules, in conjunction with the proposed mechanisms.
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Affiliation(s)
- Yuanting Su
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Link 21, Singapore 637371, Singapore.
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27
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Bartholome TA, Bluer KR, Martin CD. Successive carbene insertion into 9-phenyl-9-borafluorene. Dalton Trans 2019; 48:6319-6322. [PMID: 30942222 DOI: 10.1039/c9dt01032g] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The reactions of 9-phenyl-9-borafluorene with trimethylsilyldiazomethane in a 1 : 1 and 1 : 2 stoichiometry furnished the corresponding BC5 and BC6 heterocycles via the formal insertion of one and two carbene units.
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Affiliation(s)
- Tyler A Bartholome
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA.
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28
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Zhang W, Yu D, Wang Z, Zhang B, Xu L, Li G, Yan N, Rivard E, He G. Dibora[10]annulenes: Construction, Properties, and Their Ring-Opening Reactions. Org Lett 2018; 21:109-113. [DOI: 10.1021/acs.orglett.8b03538] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Weidong Zhang
- School of Science jointly with Frontier Institute of Science and Technology, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China
| | - Demei Yu
- School of Science jointly with Frontier Institute of Science and Technology, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China
| | - Zhijun Wang
- School of Science jointly with Frontier Institute of Science and Technology, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China
| | - Bingjie Zhang
- School of Science jointly with Frontier Institute of Science and Technology, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China
| | - Letian Xu
- School of Science jointly with Frontier Institute of Science and Technology, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China
| | - Guoping Li
- School of Science jointly with Frontier Institute of Science and Technology, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China
| | - Ni Yan
- Polymer Materials & Engineering Department, School of Materials Science & Engineering, Engineering Research Center of Transportation Materials, Ministry of Education, Chang’an University, Xi’an, Shaanxi 710064, China
| | - Eric Rivard
- Department of Chemistry, University of Alberta, Edmonton, Alberta T6G2G2, Canada
| | - Gang He
- School of Science jointly with Frontier Institute of Science and Technology, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Key Laboratory of Sustainable Energy Materials Chemistry, Xi’an Jiaotong University, Xi’an, Shaanxi Province 710049, China
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29
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Ge F, Tao X, Daniliuc CG, Kehr G, Erker G. The Borole Route to Reactive Pentafluorophenyl-Substituted Diboranes(4). Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807743] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Fang Ge
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
- Institute of Chemistry and Chemical Engineering; Qingdao University; Ningxia road 308 266071 Qingdao China
| | - Xin Tao
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
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30
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Ge F, Tao X, Daniliuc CG, Kehr G, Erker G. The Borole Route to Reactive Pentafluorophenyl-Substituted Diboranes(4). Angew Chem Int Ed Engl 2018; 57:14570-14574. [DOI: 10.1002/anie.201807743] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 08/28/2018] [Indexed: 12/19/2022]
Affiliation(s)
- Fang Ge
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
- Institute of Chemistry and Chemical Engineering; Qingdao University; Ningxia road 308 266071 Qingdao China
| | - Xin Tao
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut; Westfälische Wilhelms-Universität Münster; Corrensstr. 40 48149 Münster Germany
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31
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Kelch H, Kachel S, Wahler J, Celik MA, Stoy A, Krummenacher I, Kramer T, Radacki K, Braunschweig H. Borabicyclo[3.2.0]heptadiene: A Fused Bicyclic Isomer of Borepin. Chemistry 2018; 24:15387-15391. [DOI: 10.1002/chem.201803509] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 08/08/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Hauke Kelch
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Stephanie Kachel
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Johannes Wahler
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Mehmet Ali Celik
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Andreas Stoy
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Ivo Krummenacher
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Thomas Kramer
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Krzysztof Radacki
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Holger Braunschweig
- Institute for Inorganic ChemistryJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
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32
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Bluer KR, Laperriere LE, Pujol A, Yruegas S, Adiraju VAK, Martin CD. Coordination and Ring Expansion of 1,2-Dipolar Molecules with 9-Phenyl-9-borafluorene. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00497] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Kristen R. Bluer
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - Leif E. Laperriere
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - Alba Pujol
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - Sam Yruegas
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - Venkata A. K. Adiraju
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, Texas 76798, United States
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33
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Shoji Y, Shigeno N, Takenouchi K, Sugimoto M, Fukushima T. Mechanistic Study of Highly Efficient Direct 1,2-Carboboration of Alkynes with 9-Borafluorenes. Chemistry 2018; 24:13223-13230. [DOI: 10.1002/chem.201801818] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/21/2018] [Indexed: 01/09/2023]
Affiliation(s)
- Yoshiaki Shoji
- Laboratory for Chemistry and Life Science; Institute of Innovative Research, Tokyo Institute of Technology; 4259 Nagatsuta Midori-ku Yokohama 226-8503 Japan
| | - Naoki Shigeno
- Laboratory for Chemistry and Life Science; Institute of Innovative Research, Tokyo Institute of Technology; 4259 Nagatsuta Midori-ku Yokohama 226-8503 Japan
| | - Kumiko Takenouchi
- Laboratory for Chemistry and Life Science; Institute of Innovative Research, Tokyo Institute of Technology; 4259 Nagatsuta Midori-ku Yokohama 226-8503 Japan
| | - Manabu Sugimoto
- Faculty of Advanced Science and Technology; Kumamoto University; 2-39-1 Kurokami Chuo-ku Kumamoto 860-8555 Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science; Institute of Innovative Research, Tokyo Institute of Technology; 4259 Nagatsuta Midori-ku Yokohama 226-8503 Japan
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34
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Wang Z, Zhou Y, Zhang JX, Krummenacher I, Braunschweig H, Lin Z. DFT Studies on the Reactions of Boroles with Alkynes. Chemistry 2018; 24:9612-9621. [DOI: 10.1002/chem.201801094] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2018] [Revised: 04/04/2018] [Indexed: 12/20/2022]
Affiliation(s)
- Zheng Wang
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong P.R. China
| | - Yu Zhou
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong P.R. China
| | - Jing-Xuan Zhang
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong P.R. China
| | - Ivo Krummenacher
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Zhenyang Lin
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon Hong Kong P.R. China
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35
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Zhang W, Li G, Xu L, Zhuo Y, Wan W, Yan N, He G. 9,10-Azaboraphenanthrene-containing small molecules and conjugated polymers: synthesis and their application in chemodosimeters for the ratiometric detection of fluoride ions. Chem Sci 2018; 9:4444-4450. [PMID: 29896385 PMCID: PMC5956975 DOI: 10.1039/c8sc00688a] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Accepted: 04/06/2018] [Indexed: 01/17/2023] Open
Abstract
The introduction of main group elements into conjugated scaffolds is emerging as a key route to novel optoelectronic materials. Herein, an efficient and versatile way to synthesize polymerizable 9,10-azaboraphenanthrene (BNP)-containing monomers by aromaticity-driven ring expansion reactions between highly antiaromatic borafluorene and azides is reported, and the corresponding conjugated small molecules and polymers are developed as well. The BNP-containing small molecules and conjugated polymers showed good air/moisture stability and notable fluorescence properties. Addition of fluoride ions to the BNP-based small molecules and polymers induced a rapid change in the emission color from blue to green/yellow, respectively, accompanied by strong intensity changes. The conjugated polymers showed better ratiometric sensing performance than small molecules due to the exciton migration along the conjugated chains. Further experiments showed that the sensing process is fully reversible. The films prepared by solution-deposition of BNP-based compounds in the presence of polycaprolactone also showed good ratiometric sensing for fluoride ions.
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Affiliation(s)
- Weidong Zhang
- Frontier Institute of Science and Technology jointly with School of Science , State Key Laboratory for Strength and Vibration of Mechanical Structures , Xi'an Key Laboratory of Sustainable Energy Materials Chemistry , Xi'an Jiaotong University , Xi'an , Shaanxi 710054 , China .
| | - Guoping Li
- Frontier Institute of Science and Technology jointly with School of Science , State Key Laboratory for Strength and Vibration of Mechanical Structures , Xi'an Key Laboratory of Sustainable Energy Materials Chemistry , Xi'an Jiaotong University , Xi'an , Shaanxi 710054 , China .
| | - Letian Xu
- Frontier Institute of Science and Technology jointly with School of Science , State Key Laboratory for Strength and Vibration of Mechanical Structures , Xi'an Key Laboratory of Sustainable Energy Materials Chemistry , Xi'an Jiaotong University , Xi'an , Shaanxi 710054 , China .
| | - Yue Zhuo
- Frontier Institute of Science and Technology jointly with School of Science , State Key Laboratory for Strength and Vibration of Mechanical Structures , Xi'an Key Laboratory of Sustainable Energy Materials Chemistry , Xi'an Jiaotong University , Xi'an , Shaanxi 710054 , China .
| | - Wenming Wan
- Centre for Bioengineering and Biotechnology , China University of Petroleum (East China) , Qingdao , Shandong 266580 , China
| | - Ni Yan
- Polymer Materials & Engineering Department , Institute of Polymer Materials , School of Materials Science & Engineering , Chang'an University , Xi'an , Shaanxi 710064 , China
| | - Gang He
- Frontier Institute of Science and Technology jointly with School of Science , State Key Laboratory for Strength and Vibration of Mechanical Structures , Xi'an Key Laboratory of Sustainable Energy Materials Chemistry , Xi'an Jiaotong University , Xi'an , Shaanxi 710054 , China .
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36
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Yruegas S, Barnard JH, Al-Furaiji K, Dutton JL, Wilson DJD, Martin CD. Boraphosphaalkene Synthesis via Phosphaalkyne Insertion into 9-Borafluorene. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00248] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sam Yruegas
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco Texas 76798-7343, United States
| | - Jonathan H. Barnard
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco Texas 76798-7343, United States
| | - Khalidah Al-Furaiji
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Jason L. Dutton
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - David J. D. Wilson
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco Texas 76798-7343, United States
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37
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Adiraju VAK, Martin CD. C-H addition reactivity of 2-phenylpyridine and 2,2'-bipyridine with pentaphenylborole. Dalton Trans 2018; 46:10324-10331. [PMID: 28737800 DOI: 10.1039/c7dt02321a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The reactions of pentaphenylborole with pyridines with a pendent aryl group in the 2-position, specifically 2-phenylpyridine and 2,2'-bipyridine, readily afforded adducts. Upon thermolysis, the adducts converted to ortho C-H addition products with the two substituents introduced onto the diene on the boracyclic carbon atoms adjacent to boron in a syn fashion. Photolysis of the syn 2-phenypyridine product led to isomerization to the anti conformer which did not readily occur for the 2,2'-bipyridine complex. Such C-H bond reactivity is uncommon for main group elements and provides insight into methodologies to access boron frameworks.
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Affiliation(s)
- Venkata A K Adiraju
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA.
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38
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Yruegas S, Martinez JJ, Martin CD. Intermolecular insertion reactions of azides into 9-borafluorenes to generate 9,10-B,N-phenanthrenes. Chem Commun (Camb) 2018; 54:6808-6811. [DOI: 10.1039/c8cc01529e] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The reactions of 9-borafluorenes with organic azides result in either the insertion of the α-nitrogen and elimination of N2 or the insertion of the γ-nitrogen to generate the corresponding phenanthrene analogues with boron and nitrogen in the 9- and 10-positions, respectively.
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Affiliation(s)
- Sam Yruegas
- Baylor University
- Department of Chemistry and Biochemistry
- Waco
- USA
| | | | - Caleb D. Martin
- Baylor University
- Department of Chemistry and Biochemistry
- Waco
- USA
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39
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Wang S, Yuan K, Hu MF, Wang X, Peng T, Wang N, Li QS. Cleavage of Unstrained C−C Bonds in Acenes by Boron and Light: Transformation of Naphthalene into Benzoborepin. Angew Chem Int Ed Engl 2017; 57:1073-1077. [DOI: 10.1002/anie.201711658] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Suning Wang
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Kang Yuan
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Ming-Feng Hu
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
| | - Xiang Wang
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Tai Peng
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
| | - Nan Wang
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
| | - Quan-Song Li
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
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40
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Wang S, Yuan K, Hu MF, Wang X, Peng T, Wang N, Li QS. Cleavage of Unstrained C−C Bonds in Acenes by Boron and Light: Transformation of Naphthalene into Benzoborepin. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201711658] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Suning Wang
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Kang Yuan
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Ming-Feng Hu
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
| | - Xiang Wang
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Tai Peng
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
| | - Nan Wang
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
| | - Quan-Song Li
- Key Laboratory of Cluster Science, Ministry of Education of China; Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials; School of Chemistry and Chemical, Engineering; Beijing Institute of Technology; 5 South Zhongguancun Street Beijing P. R. China
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41
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Wang Z, Zhou Y, Lee KH, Lam WH, Dewhurst RD, Braunschweig H, Marder TB, Lin Z. DFT Studies of Dimerization Reactions of Boroles. Chemistry 2017. [PMID: 28627022 DOI: 10.1002/chem.201701737] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Boroles undergo dimerization reactions to give Diels-Alder (DA) dimers, bridged-bicyclic (BB) dimers or spiro dimers (SD) depending on the substituents on the borole. We performed DFT calculations to investigate how different substituents at the carbon atoms of the butadiene backbone as well as at the boron atom influence the dimerization reaction pathways. The DFT results show that, in general, both the DA and BB dimers are easily accessible kinetically, and the DA dimers are thermodynamically more stable than the BB dimers. When the substituent-substituent repulsive steric interactions are alleviated to a certain extent, the BB dimers are more stable than the DA dimer, and become accessible. The SD dimers are generally kinetically difficult to obtain. However, we found that aryl substituents promote the formation of the SD dimers.
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Affiliation(s)
- Zheng Wang
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong
| | - Yu Zhou
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong
| | - Ka-Ho Lee
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong
| | - Wai Han Lam
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong
| | - Rian D Dewhurst
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Todd B Marder
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Hong Kong
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42
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Adiraju VAK, Martin CD. Isomer Dependence on the Reactivity of Diazenes with Pentaphenylborole. Chemistry 2017; 23:11437-11444. [DOI: 10.1002/chem.201702539] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Venkata A. K. Adiraju
- Department of Chemistry and Biochemistry; Baylor University; One Bear Place #97348 Waco TX 76798 USA
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry; Baylor University; One Bear Place #97348 Waco TX 76798 USA
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43
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Yruegas S, Wilson C, Dutton JL, Martin CD. Ring Opening of Epoxides Induced by Pentaphenylborole. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00152] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Sam Yruegas
- Baylor University, Department of Chemistry and
Biochemistry, One Bear
Place #97348, Waco, Texas 76798, United States
| | - Charles Wilson
- Baylor University, Department of Chemistry and
Biochemistry, One Bear
Place #97348, Waco, Texas 76798, United States
| | - Jason L. Dutton
- La Trobe University, La Trobe Institute for
Molecular Science, Department of Chemistry and Physics, Melbourne, Victoria 3086, Australia
| | - Caleb D. Martin
- Baylor University, Department of Chemistry and
Biochemistry, One Bear
Place #97348, Waco, Texas 76798, United States
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44
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Tanaka N, Shoji Y, Hashizume D, Sugimoto M, Fukushima T. Formation of an Isolable Divinylborinium Ion through Twofold 1,2-Carboboration between a Diarylborinium Ion and Diphenylacetylene. Angew Chem Int Ed Engl 2017; 56:5312-5316. [DOI: 10.1002/anie.201701730] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Naoki Tanaka
- Laboratory for Chemistry and Life Science; Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
| | - Yoshiaki Shoji
- Laboratory for Chemistry and Life Science; Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
| | - Daisuke Hashizume
- Materials Characterization Support Unit; RIKEN Center for Emergent Matter Science (CEMS); 2-1 Hirosawa, Wako Saitama 351-0198 Japan
| | - Manabu Sugimoto
- Faculty of Advanced Science and Technology; Kumamoto University; 2-39-1 Kurokami, Chuo-ku Kumamoto 860-8555 Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science; Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
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45
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Tanaka N, Shoji Y, Hashizume D, Sugimoto M, Fukushima T. Formation of an Isolable Divinylborinium Ion through Twofold 1,2-Carboboration between a Diarylborinium Ion and Diphenylacetylene. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701730] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Naoki Tanaka
- Laboratory for Chemistry and Life Science; Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
| | - Yoshiaki Shoji
- Laboratory for Chemistry and Life Science; Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
| | - Daisuke Hashizume
- Materials Characterization Support Unit; RIKEN Center for Emergent Matter Science (CEMS); 2-1 Hirosawa, Wako Saitama 351-0198 Japan
| | - Manabu Sugimoto
- Faculty of Advanced Science and Technology; Kumamoto University; 2-39-1 Kurokami, Chuo-ku Kumamoto 860-8555 Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science; Institute of Innovative Research; Tokyo Institute of Technology; 4259 Nagatsuta, Midori-ku Yokohama 226-8503 Japan
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46
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Li Y, Siwatch RK, Mondal T, Li Y, Ganguly R, Koley D, So CW. Diverse Bonding Activations in the Reactivity of a Pentaphenylborole toward Sodium Phosphaethynolate: Heterocycle Synthesis and Mechanistic Studies. Inorg Chem 2017; 56:4112-4120. [DOI: 10.1021/acs.inorgchem.7b00128] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yan Li
- Division of Chemistry
and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Rahul Kumar Siwatch
- Division of Chemistry
and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Totan Mondal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
| | - Yongxin Li
- Division of Chemistry
and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Rakesh Ganguly
- Division of Chemistry
and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Debasis Koley
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741 246, India
| | - Cheuk-Wai So
- Division of Chemistry
and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
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47
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Wang Z, Zhou Y, Marder TB, Lin Z. DFT studies on reactions of boroles with carbon monoxide. Org Biomol Chem 2017; 15:7019-7027. [DOI: 10.1039/c7ob01475a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
DFT calculations were performed to study systematically the influence of borole substituents on the reaction of boroles with carbon monoxide.
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Affiliation(s)
- Zheng Wang
- Department of Chemistry
- The Hong Kong University of Science and Technology
- Clear Water Bay
- P. R. China
| | - Yu Zhou
- Department of Chemistry
- The Hong Kong University of Science and Technology
- Clear Water Bay
- P. R. China
| | - Todd B. Marder
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron
- Julius-Maximilians-Universität Würzburg
- Am Hubland
- Germany
| | - Zhenyang Lin
- Department of Chemistry
- The Hong Kong University of Science and Technology
- Clear Water Bay
- P. R. China
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48
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Sato K, Tan TTY, Schäfers F, Hahn FE, Stephan DW. Imidazole-stabilized, electron-deficient boron cations. Dalton Trans 2017; 46:16404-16407. [DOI: 10.1039/c7dt04030j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly Lewis acidic borenium cations were prepared and are shown to activate H2 and effect 1,1-carborations of alkynes.
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Affiliation(s)
- Kaoko Sato
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
- Department of chemistry
| | - Tristan Tsai Yuan Tan
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Felix Schäfers
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - F. Ekkehardt Hahn
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
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49
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Yruegas S, Martin CD. Expedient Synthesis of 1,2-Thiaborines by Means of Sulfur Insertion into Boroles. Chemistry 2016; 22:18358-18361. [DOI: 10.1002/chem.201604638] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Sam Yruegas
- Department of Chemistry and Biochemistry; Baylor University; One Bear Place #97348 Waco TX 76798 USA
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry; Baylor University; One Bear Place #97348 Waco TX 76798 USA
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50
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Shoji Y, Tanaka N, Muranaka S, Shigeno N, Sugiyama H, Takenouchi K, Hajjaj F, Fukushima T. Boron-mediated sequential alkyne insertion and C-C coupling reactions affording extended π-conjugated molecules. Nat Commun 2016; 7:12704. [PMID: 27581519 PMCID: PMC5025816 DOI: 10.1038/ncomms12704] [Citation(s) in RCA: 87] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 07/26/2016] [Indexed: 12/17/2022] Open
Abstract
C–C bond coupling reactions illustrate the wealth of organic transformations, which are usually mediated by organotransition metal complexes. Here, we show that a borafluorene with a B–Cl moiety can mediate sequential alkyne insertion (1,2-carboboration) and deborylation/Csp2–Csp2 coupling reactions, leading to aromatic molecules. The first step, which affords a borepin derivative, proceeds very efficiently between the borafluorene and various alkynes by simply mixing these two components. The second step is triggered by a one-electron oxidation of the borepin derivative, which results in the formation of a phenanthrene framework. When an excess amount of oxidant is used in the second step, the phenanthrene derivatives can be further transformed in situ to afford dibenzo[g,p]chrysene derivatives. The results presented herein will substantially expand the understanding of main group chemistry and provide a powerful synthetic tool for the construction of a wide variety of extended π-conjugated systems. Coupling reactions to form C–C bonds typically require transition metals. Here the authors report that an organoboron compound can allow sequential alkyne insertion and unusual oxidative deborylation/Csp2–Csp2 coupling, enabling the transformation of acetylenes into extended π-conjugated molecules.
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Affiliation(s)
- Yoshiaki Shoji
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Naoki Tanaka
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Sho Muranaka
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Naoki Shigeno
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Haruka Sugiyama
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Kumiko Takenouchi
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Fatin Hajjaj
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
| | - Takanori Fukushima
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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