1
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Bairagi S, Giri S, Joshi G, Jemmis ED, Ghosh S. Stabilization of Ethane-Like Dianionic Diborane(6) in Monometallic Titanium Complexes and its Subsequent B(sp 3)-B(sp 3) Bond Cleavage. Angew Chem Int Ed Engl 2024:e202417170. [PMID: 39475352 DOI: 10.1002/anie.202417170] [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: 09/06/2024] [Indexed: 11/27/2024]
Abstract
Treatment of [Cp*TiCl3] with [LiBH4 ⋅ THF] followed by thermolysis with [Ph2E2] (E=S or Se) resulted in the formation of classical diborane(6) complexes, [(Cp*Ti)(η4-B2H4LL')] (L=C6H4E; L'=C6H5E; 1 a: E=S, 1 b: E=Se), stabilized at titanium template. To the best of our knowledge, they are the first examples of mono-metallic classical diborane(6) complexes. The bonding analysis and theoretical studies suggest that the stabilization of these diborane(6) species is due to the presence of four bridging ligands in ĸ4-fashion, where two of them are phenyl thiolates/selenolates that provide more electrons to the electron-deficient titanium center. Reactions of these diborane(6) species with [M(CO)5 ⋅ THF] (M=Mo, W) led to the cleavage of the electron-precise B(sp3)-B(sp3) bond that yielded ĸ3-hydridoborato complexes [(Cp*Ti)(ĸ3-BH3R)(μ-EPh)2{M(CO)4}] (2 a-c: R=H, 3 a-c: R=Ph). In an attempt to isolate the Te-analogue of 1 a-b, a similar reaction was performed; however, the complex was too unstable to be isolated. Interestingly, the treatment of this unstable intermediate with [W(CO)5 ⋅ THF] yielded [(Cp*Ti)(ĸ3-BH3R)(μ-TePh)2{W(CO)4}] (2 d: R=H, 3 d: R=Ph) that are analogues of 2 a-c and 3 a-c, respectively. Formation of these species provide indirect evidence for the existence of unstable [(Cp*Ti)(η4-B2H4LL')] (L=C6H4Te; L'=C6H5Te; 1 c).
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Affiliation(s)
- Subhash Bairagi
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Soumen Giri
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Gaurav Joshi
- Inorganic and Physical Chemistry Department, Indian Institute of Science, Bangalore, 560012, India
| | - Eluvathingal D Jemmis
- Inorganic and Physical Chemistry Department, Indian Institute of Science, Bangalore, 560012, India
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
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2
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Niu X, Yuan M, Zhao R, Wang L, Liu Y, Zhao H, Li H, Yang X, Wang K. Fabrication strategies for chiral self-assembly surface. Mikrochim Acta 2024; 191:202. [PMID: 38492117 DOI: 10.1007/s00604-024-06278-4] [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: 01/17/2024] [Accepted: 03/05/2024] [Indexed: 03/18/2024]
Abstract
Chiral self-assembly is the spontaneous organization of individual building blocks from chiral (bio)molecules to macroscopic objects into ordered superstructures. Chiral self-assembly is ubiquitous in nature, such as DNA and proteins, which formed the foundation of biological structures. In addition to chiral (bio) molecules, chiral ordered superstructures constructed by self-assembly have also attracted much attention. Chiral self-assembly usually refers to the process of forming chiral aggregates in an ordered arrangement under various non-covalent bonding such as H-bond, π-π interactions, van der Waals forces (dipole-dipole, electrostatic effects, etc.), and hydrophobic interactions. Chiral assembly involves the spontaneous process, which followed the minimum energy rule. It is essentially an intermolecular interaction force. Self-assembled chiral materials based on chiral recognition in electrochemistry, chiral catalysis, optical sensing, chiral separation, etc. have a broad application potential with the research development of chiral materials in recent years.
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Affiliation(s)
- Xiaohui Niu
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China.
| | - Mei Yuan
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China
| | - Rui Zhao
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China
| | - Luhua Wang
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China
| | - Yongqi Liu
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China
| | - Hongfang Zhao
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China
| | - Hongxia Li
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China
| | - Xing Yang
- School of Materials Science and Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, People's Republic of China.
| | - Kunjie Wang
- College of Petrochemical Technology, Lanzhou University of Technology, 730050, Lanzhou, People's Republic of China.
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3
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Kalkuhl TL, Qin L, Zhao L, Frenking G, Hadlington TJ. On the σ-complex character of bis(gallyl)/digallane transition metal species. Chem Sci 2023; 14:11088-11095. [PMID: 37860650 PMCID: PMC10583741 DOI: 10.1039/d3sc03772j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 09/21/2023] [Indexed: 10/21/2023] Open
Abstract
σ-complexes of homoatomic E-E bonds are key intermediates in catalytically relevant oxidative addition reactions, but are as yet unknown for the group 13 elements. Here, stable species best described as σ-complexes of a 1,2-dichlorodigallane derivative with Ni and Pd are reported. They are readily accessed through the combination of a 1,2-dichlorodigallane derivative, which features chelating phosphine functionalities, with Ni0 and Pd0 synthons. In-depth computational analyses of these complexes importantly reveal considerable Ga-Ga bonding interactions in both Ni and Pd complexes, despite the expected elongation of the Ga-Ga bond upon complexation, suggestive of σ-complex character as opposed to more commonly described bis(gallyl) character. Finally, the well-defined disproportion of the Ni complex is described, leading to a unique GaI-nickel complex, with concomitant expulsion of uncomplexed GaIII species.
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Affiliation(s)
- Till L Kalkuhl
- Fakultät für Chemie, Technische Universität München Lichtenberg Strasse 4 85747 Garching Germany
| | - Lei Qin
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University Nanjing China
| | - Lili Zhao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University Nanjing China
| | - Gernot Frenking
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University Nanjing China
- Fachbereich Chemie, Philipps-Universität Marburg Hans-Meerwein-Strasse D-35043 Marburg Germany
| | - Terrance J Hadlington
- Fakultät für Chemie, Technische Universität München Lichtenberg Strasse 4 85747 Garching Germany
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4
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Mao X, Zhang J, Lu Z, Xie Z. A (μ-hydrido)diborane(4) anion and its coordination chemistry with coinage metals. Chem Sci 2022; 13:3009-3013. [PMID: 35382458 PMCID: PMC8905795 DOI: 10.1039/d2sc00318j] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/10/2022] [Indexed: 11/21/2022] Open
Abstract
A tetra(o-tolyl) (μ-hydrido)diborane(4) anion 1, an analogue of [B2H5]- species, was facilely prepared through the reaction of tetra(o-tolyl)diborane(4) with sodium hydride. Unlike common sp2-sp3 diborane species, 1 exhibited a σ-B-B bond nucleophilicity towards NHC-coordinated transition-metal (Cu, Ag, and Au) halides, resulting in the formation of η2-B-B bonded complexes 2 as confirmed by single-crystal X-ray analyses. Compared with 1, the structural data of 2 imply significant elongations of B-B bonds, following the order Au > Cu > Ag. DFT studies show that the diboron ligand interacts with the coinage metal through a three-center-two-electron B-M-B bonding mode. The fact that the B-B bond of the gold complex is much prolonged than the related Cu and Ag compounds might be ascribed to the superior electrophilicity of the gold atom.
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Affiliation(s)
- Xiaofeng Mao
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N. T. Hong Kong China
| | - Jie Zhang
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N. T. Hong Kong China
| | - Zhenpin Lu
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N. T. Hong Kong China
| | - Zuowei Xie
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong Shatin, N. T. Hong Kong China
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5
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Perutz RN, Sabo‐Etienne S, Weller AS. Metathesis by Partner Interchange in σ-Bond Ligands: Expanding Applications of the σ-CAM Mechanism. Angew Chem Int Ed Engl 2022; 61:e202111462. [PMID: 34694734 PMCID: PMC9299125 DOI: 10.1002/anie.202111462] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Indexed: 12/13/2022]
Abstract
In 2007 two of us defined the σ-Complex Assisted Metathesis mechanism (Perutz and Sabo-Etienne, Angew. Chem. Int. Ed. 2007, 46, 2578-2592), that is, the σ-CAM concept. This new approach to reaction mechanisms brought together metathesis reactions involving the formation of a variety of metal-element bonds through partner-interchange of σ-bond complexes. The key concept that defines a σ-CAM process is a single transition state for metathesis that is connected by two intermediates that are σ-bond complexes while the oxidation state of the metal remains constant in precursor, intermediates and product. This mechanism is appropriate in situations where σ-bond complexes have been isolated or computed as well-defined minima. Unlike several other mechanisms, it does not define the nature of the transition state. In this review, we highlight advances in the characterization and dynamic rearrangements of σ-bond complexes, most notably alkane and zincane complexes, but also different geometries of silane and borane complexes. We set out a selection of catalytic and stoichiometric examples of the σ-CAM mechanism that are supported by strong experimental and/or computational evidence. We then draw on these examples to demonstrate that the scope of the σ-CAM mechanism has expanded to classes of reaction not envisaged in 2007 (additional σ-bond ligands, agostic complexes, sp2 -carbon, surfaces). Finally, we provide a critical comparison to alternative mechanisms for metathesis of metal-element bonds.
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Affiliation(s)
| | - Sylviane Sabo‐Etienne
- CNRSLCC (Laboratoire de Chimie de Coordination)205 route de Narbonne, BP 44099F-31077Toulouse Cedex 4France
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6
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Perutz RN, Sabo‐Etienne S, Weller AS. Metathesis by Partner Interchange in σ‐Bond Ligands: Expanding Applications of the σ‐CAM Mechanism. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202111462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | - Sylviane Sabo‐Etienne
- CNRS LCC (Laboratoire de Chimie de Coordination) 205 route de Narbonne, BP 44099 F-31077 Toulouse Cedex 4 France
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7
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Chen X, Liu XR, Wang X, Chen XM, Jing Y, Wei D. A safe and efficient synthetic method for alkali metal octahydrotriborates, unravelling a general mechanism for constructing the delta B3 unit of polyhedral boranes. Dalton Trans 2021; 50:13676-13679. [PMID: 34590666 DOI: 10.1039/d1dt01892b] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A safe and efficient synthetic method for MB3H8 (M = Na, K, Rb and Cs) has been developed with excellent yields by directly reacting the corresponding MBH4 with the dimethyl sulfide borane complex (DMS·BH3). A general mechanism for constructing B3H8-, a basic unit for building polyhedral boranes, has been unravelled.
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Affiliation(s)
- Xuenian Chen
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China. .,Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xin-Ran Liu
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xinghua Wang
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.
| | - Xi-Meng Chen
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yi Jing
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China
| | - Donghui Wei
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.
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8
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Trageser T, Bebej D, Bolte M, Lerner HW, Wagner M. B-B vs. B-H Bond Activation in a (μ-Hydrido)diborane(4) Anion upon Cycloaddition with CO 2 , Isocyanates, or Carbodiimides. Angew Chem Int Ed Engl 2021; 60:13500-13506. [PMID: 33740318 PMCID: PMC8252796 DOI: 10.1002/anie.202103427] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Indexed: 11/11/2022]
Abstract
The intriguing (μ‐hydrido)diboranes(4) with their prominent pristine representative [B2H5]− have mainly been studied theoretically. We now describe the behavior of the planarized tetraaryl (μ‐hydrido)diborane(4) anion [1H]− in cycloaddition reactions with the homologous series of heterocumulenes CO2, iPrNCO, and iPrNCNiPr. We show that a C=O bond of CO2 selectively activates the B−B bond of [1H]−, while the μ‐H ligand is left untouched ([2H]−). The carbodiimide iPrNCNiPr, in contrast, neglects the B−B bond and rather adds the B‐bonded H− ion to its central C atom to generate a formamidinate bridge across the B2 pair ([3]−). As a hybrid, the isocyanate iPrNCO combines the reactivity patterns of both its congeners and gives two products: one of them ([4H]−) is related to [2H]−, the other ([5]−) is an analog of [3]−. We finally propose a mechanistic scenario that rationalizes the individual reaction outcomes and combines them to a coherent picture of B–B vs. B–H bond activation.
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Affiliation(s)
- Timo Trageser
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
| | - Dariusz Bebej
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
| | - Michael Bolte
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
| | - Hans-Wolfram Lerner
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
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9
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Trageser T, Bebej D, Bolte M, Lerner H, Wagner M. B–B vs. B–H Bond Activation in a (μ‐Hydrido)diborane(4) Anion upon Cycloaddition with CO
2
, Isocyanates, or Carbodiimides. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103427] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Timo Trageser
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Dariusz Bebej
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Michael Bolte
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Hans‐Wolfram Lerner
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
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10
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Brückner T, Heß M, Stennett TE, Rempel A, Braunschweig H. Synthesis of Boron Analogues of Enamines via Hydroamination of a Boron-Boron Triple Bond. Angew Chem Int Ed Engl 2021; 60:736-741. [PMID: 33058434 PMCID: PMC7839459 DOI: 10.1002/anie.202012101] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 10/14/2020] [Indexed: 01/24/2023]
Abstract
An N-heterocyclic-carbene-stabilized diboryne undergoes rapid, high-yielding and catalyst-free hydroamination reactions with primary amines, yielding 1-amino-2-hydrodiborenes, which can be considered boron analogues of enamines. The electronics of the organic substituent at nitrogen influence the structure and further reactivity of the diborene product. With electron-rich anilines, a second hydroamination can occur at the diborene to generate 1,1-diamino-2,2-dihydrodiboranes. With isopropylamine, the electronic influence of the alkyl substituent upon the diborene leads to an unprecedented boron-mediated intramolecular N-dearylation reaction of an N-heterocyclic carbene unit.
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Affiliation(s)
- Tobias Brückner
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
| | - Merlin Heß
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
| | - Tom E. Stennett
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
| | - Anna Rempel
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
| | - Holger Braunschweig
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97070WürzburgGermany
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11
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Brückner T, Heß M, Stennett TE, Rempel A, Braunschweig H. Herstellung von Boranaloga von Enaminen über Hydroaminierung einer Bor‐Bor‐Dreifachbindung. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202012101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tobias Brückner
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
- Institut für nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
| | - Merlin Heß
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
- Institut für nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
| | - Tom E. Stennett
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
- Institut für nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
| | - Anna Rempel
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
- Institut für nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
| | - Holger Braunschweig
- Institut für Anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
- Institut für nachhaltige Chemie & Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97070 Würzburg Deutschland
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12
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Budy H, Gilmer J, Trageser T, Wagner M. Anionic Organoboranes: Delicate Flowers Worth Caring for. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000786] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hendrik Budy
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
| | - Jannik Gilmer
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
| | - Timo Trageser
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie Goethe‐Universität Frankfurt Max‐von‐Laue‐Str. 7 60438 Frankfurt (Main) Germany
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13
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Affiliation(s)
- Anna Widera
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Erik Filbeck
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans‐Jörg Himmel
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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14
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Akiyama S, Yamashita M. Formation of a Dinuclear Rh(I)−/Rh(I)+ Complex Exhibiting MMCT Absorption from Dianionic Diborane(4) through C–H Bond Cleavage. CHEM LETT 2020. [DOI: 10.1246/cl.200182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Seiji Akiyama
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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15
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Prieschl D, Arrowsmith M, Dietz M, Rempel A, Müller M, Braunschweig H. Synthesis of polyheterocyclic 1,1-diboryltriazenes by γ-nitrogen insertion of azides into activated B-B single bonds. Chem Commun (Camb) 2020; 56:5681-5684. [PMID: 32319468 DOI: 10.1039/d0cc02305a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The γ-nitrogen insertion of arylazides into the B-B bond of electron-rich cyclic μ-hydridodiboranes stabilised by one N-heterocyclic carbene (NHC) ligand leads to the expansion of the central C3B2 ring, yielding unsymmetrical polyheterocyclic 1,1-diboryltriazenes. The 2-benzyl-bridged analogues undergo further NHC ring expansion and thermally induced loss of N2.
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Affiliation(s)
- Dominic Prieschl
- Institute for Inorganic Chemistry and the Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074 Würzburg, Germany.
| | - Merle Arrowsmith
- Institute for Inorganic Chemistry and the Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074 Würzburg, Germany.
| | - Maximilian Dietz
- Institute for Inorganic Chemistry and the Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074 Würzburg, Germany.
| | - Anna Rempel
- Institute for Inorganic Chemistry and the Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074 Würzburg, Germany.
| | - Marcel Müller
- Institute for Inorganic Chemistry and the Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074 Würzburg, Germany.
| | - Holger Braunschweig
- Institute for Inorganic Chemistry and the Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland, 97074 Würzburg, Germany.
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16
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Trageser T, Bolte M, Lerner HW, Wagner M. B-B Bond Nucleophilicity in a Tetraaryl μ-Hydridodiborane(4) Anion. Angew Chem Int Ed Engl 2020; 59:7726-7731. [PMID: 32058652 PMCID: PMC7317828 DOI: 10.1002/anie.202000292] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Indexed: 11/15/2022]
Abstract
The tetraaryl μ‐hydridodiborane(4) anion [2H]− possesses nucleophilic B−B and B−H bonds. Treatment of K[2H] with the electrophilic 9‐H‐9‐borafluorene (HBFlu) furnishes the B3 cluster K[3], with a triangular boron core linked through two BHB two‐electron, three‐center bonds and one electron‐precise B−B bond, reminiscent of the prominent [B3H8]− anion. Upon heating or prolonged stirring at room temperature, K[3] rearranges to a slightly more stable isomer K[3 a]. The reaction of M[2H] (M+=Li+, K+) with MeI or Me3SiCl leads to equimolar amounts of 9‐R‐9‐borafluorene and HBFlu (R=Me or Me3Si). Thus, [2H]− behaves as a masked [:BFlu]− nucleophile. The HBFlu by‐product was used in situ to establish a tandem substitution‐hydroboration reaction: a 1:1 mixture of M[2H] and allyl bromide gave the 1,3‐propylene‐linked ditopic 9‐borafluorene 5 as sole product. M[2H] also participates in unprecedented [4+1] cycloadditions with dienes to furnish dialkyl diaryl spiroborates, M[R2BFlu].
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Affiliation(s)
- Timo Trageser
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
| | - Michael Bolte
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
| | - Hans-Wolfram Lerner
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438, Frankfurt (Main), Germany
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17
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Trageser T, Bolte M, Lerner H, Wagner M. B−B Bond Nucleophilicity in a Tetraaryl μ‐Hydridodiborane(4) Anion. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202000292] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Timo Trageser
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Michael Bolte
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Hans‐Wolfram Lerner
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
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18
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Akiyama S, Ikemoto S, Muratsugu S, Tada M, Yamashita M. Copper Complexes Bearing a Dianionic Diborane(4) Ligand: Synthesis and Evaluation of the Donor Property. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00027] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Seiji Akiyama
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Aichi, Japan
| | - Satoru Ikemoto
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Aichi, Japan
| | - Satoshi Muratsugu
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Aichi, Japan
| | - Mizuki Tada
- Department of Chemistry, Graduate School of Science, Integrated Research Consortium on Chemical Science (IRCCS), Institute for Advanced Science (IAS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Aichi, Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603 Aichi, Japan
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19
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Prakash R, Pradhan AN, Jash M, Kahlal S, Cordier M, Roisnel T, Halet JF, Ghosh S. Diborane(6) and Its Analogues Stabilized by Mono-, Bi-, and Trinuclear Group 7 Templates: Combined Experimental and Theoretical Studies. Inorg Chem 2020; 59:1917-1927. [PMID: 31934757 DOI: 10.1021/acs.inorgchem.9b03217] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Irradiation of [Re2(CO)10] in the presence of BH3·thf resulted in the formation of several rhenium diborane(6) species, for example, [{(OC)4Re}{Re(CO)3}2(μ3-η2:η2:η2-B2H6)(μ-H)], 1; [{(OC)4Re}2{Re(CO)3}(μ3-η2:η2:η1-B2H6)(μ-H)], 2; and [{(OC)4Re}2(μ-η2:η2-B2H6)], 3, comprising diverse coordination modes of the [B2H6]2- ligand. Compound 1 contains a tris(bidentate) [B2H6]2- unit, whereas 2 consists of an unsymmetrically bound [μ3-η2:η2:η1-B2H6]2- ligand. In contrast, the irradiation of [Mn2(CO)10] with BH3·thf yielded only the Mn analogue of 1, [{(OC)4Mn}{Mn(CO)3}2(μ3-η2:η2:η2-B2H6)(μ-H)], 1'. In an attempt to generate the bimetallic Mn-diborane(6), we have carried out the reaction of 1' with PCy3 under photolytic conditions. The reaction led to the formation of two single base stabilized unsymmetrical diborane(5) species, [{Mn(CO)3}{Mn(CO)2PCy3}(μ-η2:η2-B2H5·PCy3)(μ-H)], 4, and [{Mn(CO)2PCy3}(η3-B2H5·PCy3)], 5. As [B2H6]2- and [B2H5·PCy3]- are isoelectronic, the bondings in 4 and 5 are analogous to that of diborane(6) species 1-3. All the new species have been characterized spectroscopically, and their structures were further confirmed by single-crystal X-ray diffraction studies. DFT-type quantum chemical calculations were carried out that provided insight into the bonding interaction of [B2H6]2- and [B2H5·PCy3]- with the M(CO)n fragments.
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Affiliation(s)
- Rini Prakash
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Alaka Nanda Pradhan
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Madhuri Jash
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
| | - Samia Kahlal
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Marie Cordier
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Thierry Roisnel
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Jean-François Halet
- CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226 , Univ Rennes , F-35000 Rennes , France
| | - Sundargopal Ghosh
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600036 , India
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20
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Saha K, Ghorai S, Kar S, Saha S, Halder R, Raghavendra B, Jemmis ED, Ghosh S. Stabilization of Classical [B
2
H
5
]
−
: Structure and Bonding of [(Cp*Ta)
2
(B
2
H
5
)(μ‐H)L
2
] (Cp*=η
5
‐C
5
Me
5
; L=SCH
2
S). Angew Chem Int Ed Engl 2019; 58:17684-17689. [DOI: 10.1002/anie.201911480] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Revised: 09/21/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Koushik Saha
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Sagar Ghorai
- Inorganic and Physical Chemistry DepartmentIndian Institute of Science Bangalore 560012 India
| | - Sourav Kar
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Suvam Saha
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Rajarshi Halder
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Beesam Raghavendra
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Eluvathingal D. Jemmis
- Inorganic and Physical Chemistry DepartmentIndian Institute of Science Bangalore 560012 India
| | - Sundargopal Ghosh
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
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21
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Borthakur R, Saha K, Kar S, Ghosh S. Recent advances in transition metal diborane(6), diborane(4) and diborene(2) chemistry. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.213021] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Saha K, Ghorai S, Kar S, Saha S, Halder R, Raghavendra B, Jemmis ED, Ghosh S. Stabilization of Classical [B
2
H
5
]
−
: Structure and Bonding of [(Cp*Ta)
2
(B
2
H
5
)(μ‐H)L
2
] (Cp*=η
5
‐C
5
Me
5
; L=SCH
2
S). Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201911480] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Koushik Saha
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Sagar Ghorai
- Inorganic and Physical Chemistry DepartmentIndian Institute of Science Bangalore 560012 India
| | - Sourav Kar
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Suvam Saha
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Rajarshi Halder
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Beesam Raghavendra
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Eluvathingal D. Jemmis
- Inorganic and Physical Chemistry DepartmentIndian Institute of Science Bangalore 560012 India
| | - Sundargopal Ghosh
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
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23
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Brückner T, Stennett TE, Heß M, Braunschweig H. Single and Double Hydroboration of B-B Triple Bonds and Convergent Routes to a Cationic Tetraborane. J Am Chem Soc 2019; 141:14898-14903. [PMID: 31454483 DOI: 10.1021/jacs.9b07991] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A compound with a boron-boron triple bond is shown to undergo stepwise hydroboration reactions with catecholborane to yield an unsymmetrical hydro(boryl)diborene and a 2,3-dihydrotetraborane. Abstraction of H- from the latter compound produces an unusual cationic, planar tetraborane with a hydrogen atom bridging the central B2 moiety. Spectroscopic and crystallographic data and DFT calculations support a "protonated diborene" structure for this compound, which can also be accessed via direct protonation of the corresponding diborene.
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24
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Prieschl D, Dietz M, Muessig JH, Wagner K, Krummenacher I, Braunschweig H. Pseudodiborenes: hydride-bridged diboranes(5) as two-electron reductants of chalcogens. Chem Commun (Camb) 2019; 55:9781-9784. [PMID: 31355376 DOI: 10.1039/c9cc04692e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The reactivity of two nucleophilic neutral sp2-sp3 diboranes towards chalcogens is presented herein. Both diboranes(5) serve as two-electron reductants, incorporating oxygen, sulfur and selenium atoms. Treatment with chalcogen sources results in the oxidative insertion of one chalcogen atom into the B-B single bond, while depending on the negative inductive effect of the chalcogen and the boron bound aryl substituent further N-heterocyclic carbene (NHC) ring expansion and hydride migration can occur. These reactions provide access to unprecedented six- or seven-membered heterocycles and help to illuminate the pseudo-multiple bonding character of hydrogen-bridged B-B single bonds.
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Affiliation(s)
- Dominic Prieschl
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
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25
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Mondal B, Bag R, Roisnel T, Ghosh S. Use of Single-Metal Fragments for Cluster Building: Synthesis, Structure, and Bonding of Heterometallaboranes. Inorg Chem 2019; 58:2744-2754. [PMID: 30701960 DOI: 10.1021/acs.inorgchem.8b03329] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synergic property of the CO ligand, in general, can stabilize metal complexes at lower oxidation states. Utilizing this feature of the CO ligand, we have recently isolated and structurally characterized a highly fluxional molybdenum complex [{Cp*Mo(CO)2}2{μ-η2:η2-B2H4}] (2; Cp* = η5-C5Me5) comprising the diborane(4) ligand. Compound 2 represents a rare class of bimetallic diborane(4) complex corresponding to a singly bridged C s structure. In an attempt to isolate the tungsten analogue of 2, [{Cp*W(CO)2}2{μ-η2:η2-B2H4}], we have isolated a rare vertex-fused cluster, [(Cp*W)3WB9H18] (5). Having a structural likeness with the dimolybdenum alkyne complex [{CpMo(CO)2}2C2H2], we have further explored the chemistry of 2 with CO gas that yielded a homoleptic trimolybdenum complex, [(Cp*Mo)3(μ-H)2(μ3-H)(μ-CO)2B4H4] (4). In an attempt to replace the 16-electron {Cp*MoH(CO)2} moiety in 4 with isolobal fragment {W(CO)5}, we treated the intermediate, obtained from the reaction of Cp*MoCl4 and LiBH4, with the monometal carbonyl fragment {W(CO)5·THF}. The reaction indeed yielded two bimetallic clusters, [(Cp*Mo)2B4H8W(CO)4] (7) and [(Cp*Mo)2B4H6W(CO)5] (8), that seem to have been generated by the replacement of one {BH} or {BH3} vertex from [(Cp*Mo)2B5H9], respectively. All of the compounds have been characterized by various spectroscopic analyses and single-crystal X-ray diffraction studies. Electron-counting rules and molecular orbital analyses provided further insight into the electronic structure of all of these molecules.
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Affiliation(s)
- Bijan Mondal
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600 036 , India
| | - Ranjit Bag
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600 036 , India
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes , UMR 6226, CNRS, Université de Rennes 1 , F-35042 Rennes Cedex , France
| | - Sundargopal Ghosh
- Department of Chemistry , Indian Institute of Technology Madras , Chennai 600 036 , India
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26
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Arrowsmith M, Mattock JD, Hagspiel S, Krummenacher I, Vargas A, Braunschweig H. Facile Synthesis of a Stable Dihydroboryl {BH 2 } - Anion. Angew Chem Int Ed Engl 2018; 57:15272-15275. [PMID: 30238575 DOI: 10.1002/anie.201809983] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Indexed: 01/23/2023]
Abstract
While the one-electron reduction of (CAACMe )BH2 Br (CAACMe =1-(2,6-diisopropylphenyl)-3,3,5,5-tetramethylpyrrolidin-2-ylidene) yields a hydride-shift isomer of the corresponding tetrahydrodiborane, a further reversible reduction leads to the first stable parent boryl anion, [(CAACMe )BH2 ]- , which acts as a powerful boron nucleophile.
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Affiliation(s)
- Merle Arrowsmith
- Institut für Anorganische Chemie, 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
| | - James D Mattock
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton, BN1 9QJ, Sussex, UK
| | - Stephan Hagspiel
- Institut für Anorganische Chemie, 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
| | - Ivo Krummenacher
- Institut für Anorganische Chemie, 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
| | - Alfredo Vargas
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton, BN1 9QJ, Sussex, UK
| | - Holger Braunschweig
- Institut für Anorganische Chemie, 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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27
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Arrowsmith M, Mattock JD, Hagspiel S, Krummenacher I, Vargas A, Braunschweig H. Einfacher Zugang zum ersten stabilen {BH
2
}
−
Dihydroborylanion. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201809983] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Merle Arrowsmith
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - James D. Mattock
- Department of ChemistrySchool of Life SciencesUniversity of Sussex Brighton BN1 9QJ Sussex Großbritannien
| | - Stephan Hagspiel
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Ivo Krummenacher
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Alfredo Vargas
- Department of ChemistrySchool of Life SciencesUniversity of Sussex Brighton BN1 9QJ Sussex Großbritannien
| | - Holger Braunschweig
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
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28
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Diboryldiborene: π-konjugierte B4
-Ketten isoelektronisch zum Butadien-Dikation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805394] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Hermann A, Cid J, Mattock JD, Dewhurst RD, Krummenacher I, Vargas A, Ingleson MJ, Braunschweig H. Diboryldiborenes: π-Conjugated B4
Chains Isoelectronic to the Butadiene Dication. Angew Chem Int Ed Engl 2018; 57:10091-10095. [DOI: 10.1002/anie.201805394] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Indexed: 01/14/2023]
Affiliation(s)
- Alexander Hermann
- 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
| | - Jessica Cid
- School of Chemistry; University of Manchester; Manchester UK
| | - James D. Mattock
- Department of Chemistry; School of Life Sciences; University of Sussex; Brighton BN1 9QJ Sussex UK
| | - Rian D. Dewhurst
- 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
| | - 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
| | - Alfredo Vargas
- Department of Chemistry; School of Life Sciences; University of Sussex; Brighton BN1 9QJ Sussex UK
| | | | - 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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30
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Böhnke J, Brückner T, Hermann A, González-Belman OF, Arrowsmith M, Jiménez-Halla JOC, Braunschweig H. Single and double activation of acetone by isolobal B[triple bond, length as m-dash]N and B[triple bond, length as m-dash]B triple bonds. Chem Sci 2018; 9:5354-5359. [PMID: 30009006 PMCID: PMC6009441 DOI: 10.1039/c8sc01249k] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 04/28/2018] [Indexed: 11/21/2022] Open
Abstract
Polar and apolar boron-based triple bonds promote the single and double C–H activation of acetone following similar coordination-deprotonation mechanisms.
B
Created by potrace 1.16, written by Peter Selinger 2001-2019
]]>
N and B
Created by potrace 1.16, written by Peter Selinger 2001-2019
]]>
B triple bonds induce C–H activation of acetone to yield a (2-propenyloxy)aminoborane and an unsymmetrical 1-(2-propenyloxy)-2-hydrodiborene, respectively. DFT calculations showed that, despite their stark electronic differences, both the B
Created by potrace 1.16, written by Peter Selinger 2001-2019
]]>
N and B
Created by potrace 1.16, written by Peter Selinger 2001-2019
]]>
B triple bonds activate acetone via a similar coordination-deprotonation mechanism. In contrast, the reaction of acetone with a cAAC-supported diboracumulene yielded a unique 1,2,3-oxadiborole, which according to DFT calculations also proceeds via an unsymmetrical diborene, followed by intramolecular hydride migration and a second C–H activation of the enolate ligand.
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Affiliation(s)
- Julian Böhnke
- Institut für Anorganische Chemie , 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
| | - Tobias Brückner
- Institut für Anorganische Chemie , 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
| | - Alexander Hermann
- Institut für Anorganische Chemie , 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
| | - Oscar F González-Belman
- Departamento de Química , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , México .
| | - Merle Arrowsmith
- Institut für Anorganische Chemie , 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
| | - J Oscar C Jiménez-Halla
- Departamento de Química , Universidad de Guanajuato , Noria Alta S/N , 36050 Guanajuato , México .
| | - Holger Braunschweig
- Institut für Anorganische Chemie , 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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