1
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Siwatch RK, Yang MC, Su MD, So CW. A Digermanium(III) 1,2-Dication Stabilized by Amidinate and cAAC-Phosphinidenide Ligands. Inorg Chem 2024; 63:8511-8515. [PMID: 38687917 DOI: 10.1021/acs.inorgchem.4c00471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/02/2024]
Abstract
A digermanium(III) 1,2-dication comprises two cationic centers located at two interconnected Ge atoms. The strong Coulombic repulsion between two positively charged germanium cations hinders their bond formation. Balancing these two oppositions was achieved by using amidinate and cyclic (alkyl)amino carbene (cAAC)-phosphinidenide ligands, where an amidinato cAAC-phosphinidenidogermylene complex, [LGeP(cAACMe)] (2, where L = PhC(NtBu)2, cAACMe = :C{C(Me)2CH2C(Me)2NAr}, and Ar = 2,6-iPr2C6H3), underwent one-electron oxidation with a bis(phosphinidene) radical cation, [(cAACMe)P]2•+, to form a digermanium(III) 1,2-dication, [LGeP(cAACMe)]22+, in compound 4.
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Affiliation(s)
- Rahul Kumar Siwatch
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371 Singapore
| | - Ming-Chung Yang
- Department of Applied Chemistry, National Chiayi University, Chiayi 60004, Taiwan
| | - Ming-Der Su
- Department of Applied Chemistry, National Chiayi University, Chiayi 60004, Taiwan
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Cheuk-Wai So
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371 Singapore
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2
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H. El-Demerdash S, F. Gad S, M. El-Mehasseb I, E. El-Kelany K. Isosterism in pyrrole via azaboroles substitution, a theoretical investigation for electronic structural, stability and aromaticity. Heliyon 2023; 9:e20542. [PMID: 37810871 PMCID: PMC10551570 DOI: 10.1016/j.heliyon.2023.e20542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 08/26/2023] [Accepted: 09/28/2023] [Indexed: 10/10/2023] Open
Abstract
This work uses ab-initio CBS-QB3 and density functional theory (B3LYP) to analyze the structure, stability, and aromaticity of all isosteric nitrogen-boron pyrroles. The mono-NB unit substituted group of the isosteric NB pyrrole has four isosteres, whereas the multi-NB unit substituted group has two isosteres. These two groups make up all isosteric NB pyrrole. For structural, energetic, magnetic, and electron delocalization criteria, the results highlight the predominance of the PN3B2 isostere and its greater stability over other conformers. In addition, the global reactivity indices, ESP, HOMO-LUMO, and NBO charges have all been estimated to forecast the active side's electron donation and acceptance. These isosteres are categorized as weak electrophiles and marginal nucleophiles. NB-isosteres have poorer stability, HOMO-LUMO gap, and aromaticity than the parent (pyrrole). In general, NB compounds with more ring sharing are less aromatic than NB molecules with less ring sharing. The current study is anticipated to help in understanding of the chemistry of NB substituted molecules and their experimental identification and characterization.
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Affiliation(s)
| | - Shaimaa F. Gad
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516, Kafr el-Sheikh, Egypt
| | - Ibrahim M. El-Mehasseb
- Chemistry Department, Faculty of Science, Kafrelsheikh University, 33516, Kafr el-Sheikh, Egypt
| | - Khaled E. El-Kelany
- Institute of Nanoscience and Nanotechnology, Kafrelsheikh University, 33516, Kafr el-skiekh, Egypt
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3
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Kistner L, Filbeck E, Ihle P, Bučak Gasser D, Häussermann SWH, Kowatsch D, Kaifer E, Himmel H. Cationic Symmetrically and Unsymmetrically Substituted Diboranes and Bis(diboranes) with Direct Boron‐Boron Bond: Synthesis by Substitution, Stability and Properties. European J Org Chem 2023. [DOI: 10.1002/ejoc.202300038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Affiliation(s)
- Lucas Kistner
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Erik Filbeck
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Patrick Ihle
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - David Bučak Gasser
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Sebastian W. H. Häussermann
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Dario Kowatsch
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Elisabeth Kaifer
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans‐Jörg Himmel
- Inorganic Chemistry Ruprecht-Karls University of Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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4
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Zhang Y, Wu L, Wang H. Neutral Homoaromatic Diboradisilacyclobutene: Synthesis, Structure, and Reactivity. J Am Chem Soc 2022; 144:22446-22450. [PMID: 36459696 DOI: 10.1021/jacs.2c11204] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
A formally neutral homoaromatic diboradisilacyclobutene was prepared and structurally characterized via the reduction of borylaminobromosilane with potassium graphite, which represents the first neutral boron and silicon mixed analogue of the homocyclopropenylium ion. Single-crystal X-ray analyses revealed a folded four-membered B2Si2 ring (26.2°) and a remarkably short transannular B-Si distance of 2.306(3) Å. DFT calculations showed that two π-electrons delocalize over the BSi2 moiety. Both structural feature and DFT calculations show the significant 2π-homoaromatic nature of the diboradisilacyclobutene. Furthermore, diboradisilacyclobutene reacted readily with CuCl or HCl to afford the diboradisilacyclobutanes.
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Affiliation(s)
- Yu Zhang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
| | - Linlin Wu
- Hunan Provincial Key Laboratory of Micro & Nano Materials Interfaces Science, College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, P. R. China
| | - Hao Wang
- School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China
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5
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Kistner L, Kowatsch D, Marz A, Kaifer E, Himmel H. Directed Synthesis and Chemistry of Unsymmetric Dicationic Diboranes and Their Use in Frustrated Lewis Pair-like Chemistry. Chemistry 2022; 28:e202104016. [PMID: 35061309 PMCID: PMC9305129 DOI: 10.1002/chem.202104016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Indexed: 11/15/2022]
Abstract
The chemistry of dicationic diboranes with two BII atoms that are engaged in direct B-B bonding is by enlarge unexplored, although these molecules have intriguing properties due to their combined Lewis acidic and electron-donor properties. Unsymmetric dicationic diboranes are extremely rare, but especially attractive due to their polarized B-B bond. In this work we report the directed synthesis of several stable unsymmetric dicationic diboranes by reaction between the electron-rich ditriflato-diborane B2 (hpp)2 (OTf)2 (hpp=1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-α]pyrimidinate) and phosphino-pyridines, establishing B-N and B-P bonds with the diborane concomitant with triflate elimination. In the case of 2-((ditertbutylphosphino)methyl)pyridine, the B-N bond is formed instantly, but the B-P bond formation requires (due to steric constraints) several days at ambient conditions for completion, creating an intermediate that could be used for frustrated Lewis pair (FLP)-like chemistry. Here we test its reaction with an aldehyde, and propose a new type of FLP-like chemistry.
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Affiliation(s)
- Lucas Kistner
- Anorganisch-Chemisches InstitutRuprecht-Karls Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Dario Kowatsch
- Anorganisch-Chemisches InstitutRuprecht-Karls Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Andreas Marz
- Anorganisch-Chemisches InstitutRuprecht-Karls Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches InstitutRuprecht-Karls Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Hans‐Jörg Himmel
- Anorganisch-Chemisches InstitutRuprecht-Karls Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
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6
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Shih DN, Boobalan R, Liu YH, Chein RJ, Chiu CW. [B-Cl-B] + Cations: Chloroborane Masked Chiral Borenium Ions. Inorg Chem 2021; 60:16266-16272. [PMID: 34672549 DOI: 10.1021/acs.inorgchem.1c02073] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A tricoordinate borenium ion has received considerable attention in recent years for its applications in Lewis acid catalysis. Over the years, asymmetric catalysis mediated by a chiral borenium ion has also been developed. To stabilize the electron-deficient boron atom, a series of chloroborane masked borenium ions featuring the symmetrical [B-Cl-B]+ linkage are prepared and utilized as the catalyst for the enantioselective Diels-Alder cycloaddition of cyclopentadiene and 2,2,2-trifluoroethyl acrylate. The presence of a Cp* ligand is critical in realizing the cyclic diboron compounds, and the stability of the resulting [B-Cl-B]+ cation is dependent on the steric bulkiness of the oxazolidinone moiety. The stereoselectivity of the Diels-Alder cycloaddition is controlled by the substituents of the chiral oxazolidinone ligand and could be further improved via the coordination of SnCl4 at the bridging chloride of the [B-Cl-B]+ cation.
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Affiliation(s)
- Ding-Nan Shih
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | | | - Yi-Hung Liu
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Rong-Jie Chein
- Institute of Chemistry, Academia Sinica, Taipei 11529, Taiwan
| | - Ching-Wen Chiu
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
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7
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Fırıncı E, Fırıncı R, Sevinçek R, Aygün M, Şahin Y. Neutral cyclic sp 2-sp 3 and sp 3-sp 3 diboranes from N, N'-dicyclohexylcarbodiimide insertion into 1,2-dichlorodiboranes(4). Chem Commun (Camb) 2020; 56:9807-9810. [PMID: 32706012 DOI: 10.1039/d0cc03454a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We report the synthesis and structural characterization of new neutral cyclic sp2-sp3 and sp3-sp3 diboranes from the reaction of N,N'-dicyclohexylcarbodiimide with 1,2-dichlorodiboranes(4) at room temperature. The present study is the first example of an insertion reaction of carbodiimide into diborane(4).
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Affiliation(s)
- Erkan Fırıncı
- Department of Chemistry, Science and Art Faculty, Aydın Adnan Menderes University, Aydın, Turkey.
| | - Rukiye Fırıncı
- Department of Chemistry, Science and Art Faculty, Aydın Adnan Menderes University, Aydın, Turkey.
| | - Resul Sevinçek
- Department of Physics, Science Faculty, Dokuz Eylül University, İzmir, Turkey
| | - Muhittin Aygün
- Department of Physics, Science Faculty, Dokuz Eylül University, İzmir, Turkey
| | - Yüksel Şahin
- Department of Chemistry, Science and Art Faculty, Aydın Adnan Menderes University, Aydın, Turkey.
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8
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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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9
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Schön F, Greb L, Kaifer E, Himmel H. Desymmetrization of Dicationic Diboranes by Isomerization Catalyzed by a Nucleophile. Angew Chem Int Ed Engl 2020; 59:9127-9133. [PMID: 32181953 PMCID: PMC7317786 DOI: 10.1002/anie.202001640] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/16/2020] [Indexed: 11/11/2022]
Abstract
Cationic monoboranes exhibit a rich chemistry. By constrast, only a few cationic diboranes are known, that all are symmetrically substituted. In this work, the first unsymmetrically substituted dicationic diboranes, featuring sp2 -sp2 -hybridized boron atoms, are reported. The compounds are formed by intramolecular rearrangement from preceding isomeric symmetrically substituted dicationic diboranes, a process that is catalyzed by nucleophiles. From the temperature-dependence of the isomerization rate, activation parameters for this unprecedented rearrangement are derived. The difference in fluoride ion affinity between the two boron atoms and the bonding situation in these unique unsymmetrical dicationic diboranes are evaluated.
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Affiliation(s)
- Florian Schön
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Lutz Greb
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
| | - Hans‐Jörg Himmel
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069120HeidelbergGermany
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10
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Schön F, Greb L, Kaifer E, Himmel H. Desymmetrization of Dicationic Diboranes by Isomerization Catalyzed by a Nucleophile. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001640] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Florian Schön
- Anorganisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Lutz Greb
- Anorganisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Elisabeth Kaifer
- 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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11
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Rawat S, Bhandari M, Porwal VK, Singh S. Hydrosilylation of Carbonyls Catalyzed by Hydridoborenium Borate Salts: Lewis Acid Activation and Anion Mediated Pathways. Inorg Chem 2020; 59:7195-7203. [PMID: 32364748 DOI: 10.1021/acs.inorgchem.0c00646] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The electronically unsaturated three-coordinated hydridoborenium cations [LBH]+[HB(C6F5)3]- (1) and [LBH]+[B(C6F5)4]- (2), supported by a bis(phosphinimino)amide ligand, were found to be excellent catalysts for hydrosilylation of a range of aliphatic and aromatic aldehydes and ketones under mild reaction conditions (L = [{(2,4,6-Me3C6H2N)P(Ph2)}2N]). The key steps of the catalytic cycle for hydrosilylation of PhCHO were monitored via in situ multinuclear NMR measurements for catalysts 1 and 2. The combined effect of carbonyl activation via the Lewis acidic hydridoborenium cation and the hydridic nature of the borate counteranion in 1 makes it a more efficient catalyst in comparison to that of carbonyl activation via the predominant Lewis acid activation pathway operating with catalyst 2. The catalytic cycle of 1 showed hydride transfer from the borate moiety [HB(C6F5)3]- to PhCHO in the first step, forming [PhCH2-O-B(C6F5)3]-, which subsequently underwent σ-bond metathesis with Et3SiH to form the product, PhCH2-O-SiEt3. Quantum chemical calculations also support the borate anion mediated mechanism with 1. In contrast, the reaction catalyzed by 2 proceeds predominantly via the Lewis acid activation of the carbonyl group involving [LB(H)←OC(H)Ph]+[B(C6F5)4]- as the transition state and [LBOCH2Ph]+[B(C6F5)4]- as the intermediate.
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Affiliation(s)
- Sandeep Rawat
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali Knowledge City, Sector 81, SAS Nagar, Mohali 140306, Punjab, India
| | - Mamta Bhandari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali Knowledge City, Sector 81, SAS Nagar, Mohali 140306, Punjab, India
| | - Vishal Kumar Porwal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali Knowledge City, Sector 81, SAS Nagar, Mohali 140306, Punjab, India
| | - Sanjay Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali Knowledge City, Sector 81, SAS Nagar, Mohali 140306, Punjab, India
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12
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Widera A, Filbeck E, Wadepohl H, Kaifer E, Himmel H. Electron-Rich, Lewis Acidic Diborane Meets N-Heterocyclic Aromatics: Formation and Electron Transfer in Cyclophane Boranes. Chemistry 2020; 26:3435-3440. [PMID: 31943435 PMCID: PMC7155121 DOI: 10.1002/chem.202000189] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Indexed: 01/17/2023]
Abstract
Herein reported are the reactions of an electron-rich, Lewis acidic diborane with N-heterocyclic aromatics to give first members of an unprecedented family of highly charged cationic cyclophanes with diboranyl units. Tetracationic cyclophanes with 4,4'-bipyridine/ 1,2-bis(4-pyridyl)ethylene and diboranyl units were synthesized and their redox chemistry was studied. Cyclisation of two diboranyl and two pyrazine units is accompanied by electron transfer from the diboranyl unit to the pyrazine. Our results pave the way for the integration of redox-active diboranyl units into cyclophanes and supramolecular structures.
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Affiliation(s)
- Anna Widera
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069121HeidelbergGermany
| | - Erik Filbeck
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069121HeidelbergGermany
| | - Hubert Wadepohl
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069121HeidelbergGermany
| | - Elisabeth Kaifer
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069121HeidelbergGermany
| | - Hans‐Jörg Himmel
- Anorganisch-Chemisches InstitutRuprecht-Karls-Universität HeidelbergIm Neuenheimer Feld 27069121HeidelbergGermany
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13
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Englert L, Stoy A, Arrowsmith M, Muessig JH, Thaler M, Deißenberger A, Häfner A, Böhnke J, Hupp F, Seufert J, Mies J, Damme A, Dellermann T, Hammond K, Kupfer T, Radacki K, Thiess T, Braunschweig H. Stable Lewis Base Adducts of Tetrahalodiboranes: Synthetic Methods and Structural Diversity. Chemistry 2019; 25:8612-8622. [DOI: 10.1002/chem.201901437] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Indexed: 02/02/2023]
Affiliation(s)
- Lukas Englert
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Andreas Stoy
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Merle Arrowsmith
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Jonas H. Muessig
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Melanie Thaler
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Andrea Deißenberger
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Alena Häfner
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Julian Böhnke
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Florian Hupp
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Jens Seufert
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Jan Mies
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Alexander Damme
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Theresa Dellermann
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Kai Hammond
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Thomas Kupfer
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Krzysztof Radacki
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Torsten Thiess
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry and theInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
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14
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Himmel H. Electron‐Deficient Triborane and Tetraborane Ring Compounds: Synthesis, Structure, and Bonding. Angew Chem Int Ed Engl 2019; 58:11600-11617. [DOI: 10.1002/anie.201900563] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Hans‐Jörg Himmel
- Anorganisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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15
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Himmel H. Elektronen‐defizitäre Triboran‐ und Tetraboran‐Ringverbindungen: Synthese, Struktur und Bindung. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900563] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hans‐Jörg Himmel
- Anorganisch-Chemisches Institut Ruprecht-Karls-Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
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16
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Elias J, Kaifer E, Himmel HJ. Boron-Boron Dehydrocoupling of Boranes Initiated by Reaction with Iodine. Chemistry 2019; 25:6553-6561. [PMID: 30821401 DOI: 10.1002/chem.201900671] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Indexed: 01/07/2023]
Abstract
A new boron-boron dehydrocoupling strategy was established, providing convenient access to some diborane(4) compounds starting from simple borane adducts under mild conditions. In contrast to the traditional pathway using a reducing reagent, the reduction from BIII to BII was paradoxically initiated by the addition of the oxidation-reagent iodine. A reaction pathway for this unusual reaction was proposed based on quantum-chemical calculations.
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Affiliation(s)
- Jana Elias
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Elisabeth Kaifer
- 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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17
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Franz D, Inoue S. Cationic Complexes of Boron and Aluminum: An Early 21st Century Viewpoint. Chemistry 2018; 25:2898-2926. [PMID: 30113744 DOI: 10.1002/chem.201803370] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Indexed: 01/03/2023]
Abstract
Boron and aluminum are lighter Group 13 elements, found in daily life commodities, and considered environmentally benign. Nevertheless, they markedly differ in their elemental properties (e.g., metal character, atomic radius). The use of Lewis acidic complexes of boron and aluminum for methods of bond activation and catalysis (e.g., hydrogenation of unsaturated substrates, polymerization of olefins and epoxides) is quickly expanding. The introduction of cationic charge may boost the metalloid-centered Lewis acidity and allow for its fine-tuning particularly with regard to preference for "hard" or "soft" Lewis bases (i.e., substrates). Especially the isolation of low-coordinate cations (number of ligand atoms smaller than four) demands elaborate techniques of thermodynamic and kinetic stabilization (i.e., electronic saturation and steric shielding) by a ligand system. Furthermore, the properties of the solvent and the counteranion must be considered with care. Here, selected examples of boron and aluminum cations are described.
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Affiliation(s)
- Daniel Franz
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748, Garching bei München, Germany
| | - Shigeyoshi Inoue
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, 85748, Garching bei München, Germany
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18
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Lu W, Xu K, Li Y, Hirao H, Kinjo R. Facile Activation of Homoatomic σ Bonds in White Phosphorus and Diborane by a Diboraallene. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201808357] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Wei Lu
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Kai Xu
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong China
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Hajime Hirao
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong China
| | - Rei Kinjo
- 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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19
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Lu W, Xu K, Li Y, Hirao H, Kinjo R. Facile Activation of Homoatomic σ Bonds in White Phosphorus and Diborane by a Diboraallene. Angew Chem Int Ed Engl 2018; 57:15691-15695. [DOI: 10.1002/anie.201808357] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 09/08/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Wei Lu
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Kai Xu
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong China
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Hajime Hirao
- Department of Chemistry; City University of Hong Kong; Tat Chee Avenue, Kowloon Hong Kong China
| | - Rei Kinjo
- 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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20
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Widera A, Vogler D, Wadepohl H, Kaifer E, Himmel HJ. Bor(II)-Kationen: Ein Zusammenspiel zwischen Lewis-Paar-Akzeptor- und Elektronendonor-Eigenschaften. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806135] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Anna Widera
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Daniel Vogler
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Elisabeth Kaifer
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Hans-Jörg Himmel
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
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21
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Widera A, Vogler D, Wadepohl H, Kaifer E, Himmel HJ. Boron(II) Cations: Interplay between Lewis-Pair-Acceptor and Electron-Donor Properties. Angew Chem Int Ed Engl 2018; 57:11456-11459. [DOI: 10.1002/anie.201806135] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Anna Widera
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Daniel Vogler
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Elisabeth Kaifer
- 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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22
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Himmel H. Nucleophilic Neutral Diborane(4) Compounds with sp
3
–sp
3
‐Hybridized Boron Atoms. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800031] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Hans‐Jörg Himmel
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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23
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Wang H, Zhang J, Lee HK, Xie Z. Borylene Insertion into Cage B–H Bond: A Route to Electron-Precise B–B Single Bond. J Am Chem Soc 2018; 140:3888-3891. [DOI: 10.1021/jacs.8b01795] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hao Wang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Jiji Zhang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Hung Kay Lee
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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24
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Franz D, Szilvási T, Pöthig A, Deiser F, Inoue S. Three-Coordinate Boron(III) and Diboron(II) Dications. Chemistry 2018; 24:4283-4288. [DOI: 10.1002/chem.201800609] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Indexed: 11/08/2022]
Affiliation(s)
- Daniel Franz
- Department of Chemistry, Catalysis Research Center; Institute of Silicon Chemistry; Technische Universität München; Lichtenbergstr. 4 85748 Garching bei München Germany
| | - Tibor Szilvási
- Department of Chemical and Biological Engineering; University of Wisconsin-Madison; 1415 Engineering Drive Madison WI 53706-1607 USA
| | - Alexander Pöthig
- Department of Chemistry, Catalysis Research Center; Institute of Silicon Chemistry; Technische Universität München; Lichtenbergstr. 4 85748 Garching bei München Germany
| | - Franziska Deiser
- Department of Chemistry, Catalysis Research Center; Institute of Silicon Chemistry; Technische Universität München; Lichtenbergstr. 4 85748 Garching bei München Germany
| | - Shigeyoshi Inoue
- Department of Chemistry, Catalysis Research Center; Institute of Silicon Chemistry; Technische Universität München; Lichtenbergstr. 4 85748 Garching bei München Germany
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25
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Flinker M, Yin H, Juhl RW, Eikeland EZ, Overgaard J, Nielsen DU, Skrydstrup T. Efficient Water Reduction with sp3
-sp3
Diboron(4) Compounds: Application to Hydrogenations, H-D Exchange Reactions, and Carbonyl Reductions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709685] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mathias Flinker
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Hongfei Yin
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - René W. Juhl
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Espen Z. Eikeland
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Jacob Overgaard
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Dennis U. Nielsen
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Troels Skrydstrup
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
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26
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Flinker M, Yin H, Juhl RW, Eikeland EZ, Overgaard J, Nielsen DU, Skrydstrup T. Efficient Water Reduction with sp3
-sp3
Diboron(4) Compounds: Application to Hydrogenations, H-D Exchange Reactions, and Carbonyl Reductions. Angew Chem Int Ed Engl 2017; 56:15910-15915. [DOI: 10.1002/anie.201709685] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Revised: 10/24/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Mathias Flinker
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Hongfei Yin
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - René W. Juhl
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Espen Z. Eikeland
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Jacob Overgaard
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Dennis U. Nielsen
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
| | - Troels Skrydstrup
- Carbon Dioxide Activation Center (CADIAC); Center for Materials Crystallography (CMC); Department of Chemistry and the; Interdisciplinary Nanoscience Center (iNANO); Aarhus University; Gustav Wieds Vej 14 8000 Aarhus C Denmark
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27
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Yoshida H, Seki M, Kageyuki I, Osaka I, Hatano S, Abe M. B(MIDA)-Containing Diborons. ACS OMEGA 2017; 2:5911-5916. [PMID: 31457845 PMCID: PMC6644665 DOI: 10.1021/acsomega.7b01042] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Accepted: 09/05/2017] [Indexed: 06/10/2023]
Abstract
Unsymmetrical B(MIDA)-containing diborons of potential synthetic utility were found to be synthesized from the readily available (neop)B-B(neop) and (HO)2B-B(OH)2, and the procedure was extended to the generation of symmetrical (MIDA)B-B(MIDA). NMR and X-ray crystal structure studies revealed that B(MIDA) units of all of the diborons obtained in this study were in rigid tetrahedral environment.
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Affiliation(s)
- Hiroto Yoshida
- Department
of Applied Chemistry, Graduate School of Engineering and Department of
Chemistry, Graduate School of Science, Hiroshima
University, Higashi-Hiroshima 739-8527, Japan
| | - Michinari Seki
- Department
of Applied Chemistry, Graduate School of Engineering and Department of
Chemistry, Graduate School of Science, Hiroshima
University, Higashi-Hiroshima 739-8527, Japan
| | - Ikuo Kageyuki
- Department
of Applied Chemistry, Graduate School of Engineering and Department of
Chemistry, Graduate School of Science, Hiroshima
University, Higashi-Hiroshima 739-8527, Japan
| | - Itaru Osaka
- Department
of Applied Chemistry, Graduate School of Engineering and Department of
Chemistry, Graduate School of Science, Hiroshima
University, Higashi-Hiroshima 739-8527, Japan
| | - Sayaka Hatano
- Department
of Applied Chemistry, Graduate School of Engineering and Department of
Chemistry, Graduate School of Science, Hiroshima
University, Higashi-Hiroshima 739-8527, Japan
| | - Manabu Abe
- Department
of Applied Chemistry, Graduate School of Engineering and Department of
Chemistry, Graduate School of Science, Hiroshima
University, Higashi-Hiroshima 739-8527, Japan
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28
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Cao LL, Stephan DW. Homolytic Cleavage Reactions of a Neutral Doubly Base Stabilized Diborane(4). Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00522] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Levy L. Cao
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Douglas W. Stephan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
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29
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Soleilhavoup M, Bertrand G. Borylenes: An Emerging Class of Compounds. Angew Chem Int Ed Engl 2017; 56:10282-10292. [PMID: 28577325 DOI: 10.1002/anie.201705153] [Citation(s) in RCA: 127] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Indexed: 11/11/2022]
Abstract
Free borylenes (R-B:) have only been spectroscopically characterized in the gas phase or in matrices at very low temperatures. However, in recent years, a few mono- and bis(Lewis base)-stabilized borylenes have been isolated. In both of these compounds the boron atom is in the formal oxidation state +I which contrasts with classical organoboron derivatives wherein the element is in the +III oxidation state. Mono(Lewis base)-stabilized borylenes are isoelectronic with singlet carbenes, and their reactivity mimics to some extent that of transition metals. They can activate small molecules, such as H2 , and coordinate an additional ligand; in other words, they are boron metallomimics. Bis(Lewis base)borylene adducts are isoelectronic with amines and phosphines. In contrast to boranes, which act as electron acceptors and thus Lewis acids, they are electron-rich and act as ligands for transition metals.
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Affiliation(s)
- Michele Soleilhavoup
- UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093-0358, USA
| | - Guy Bertrand
- UCSD-CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA, 92093-0358, USA
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30
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Affiliation(s)
- Michele Soleilhavoup
- UCSD – CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry University of California, San Diego La Jolla CA 92093-0358 USA
| | - Guy Bertrand
- UCSD – CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry University of California, San Diego La Jolla CA 92093-0358 USA
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31
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Affiliation(s)
- Ya-Fan Lin
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, No. 100, Shih-Chuan First Road, Kaohsiung, Taiwan 80708
| | - Ching-Wen Chiu
- Department of Chemistry, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei, Taiwan 10617
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32
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Wong YTA, Landmann J, Finze M, Bryce DL. Dynamic Disorder and Electronic Structures of Electron-Precise Dianionic Diboranes: Insights from Solid-State Multinuclear Magnetic Resonance Spectroscopy. J Am Chem Soc 2017; 139:8200-8211. [PMID: 28548827 DOI: 10.1021/jacs.7b01783] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The J(11B,11B) coupling constants of various salts of the electron-precise hexacyanodiborane(6) dianion, [B2(CN)6]2-, were obtained using 11B double-quantum-filtered (DQF) J-resolved solid-state nuclear magnetic resonance (SSNMR) spectroscopy. Our results show that the magnitude of the DQF J splitting is influenced by both the crystallographic symmetry of the system and the presence of dynamics. The splittings are amplified by a factor of 3 as compared to the corresponding theoretical J coupling constants for cases where (1) there is an absence of dynamics but the boron pairs are crystallographically equivalent or (2) the boron pairs are crystallographically inequivalent but are rendered magnetically equivalent on the time scale of the experiment due to dynamic disorder, which was identified by 11B and 13C SSNMR experiments. Consequently, molecular motions need to be taken into consideration when interpreting the results of DQF J-resolved experiments, and conversely, these experiments may be used to identify dynamic disorder. Variable-temperature NMR data support the notion of three different motional processes with correlation times ranging from 102 to 106 s-1 over the temperature range of 248-306 K. When molecular motion and crystallographic symmetry are both accounted for, the J(11B,11B) coupling constants for various [B2(CN)6]2- salts were measured to range from 29.4 to 35.8 Hz, and their electronic origins were determined using natural localized molecular orbital and natural bond orbital analyses. The coupling constants were found to strongly correlate to the hybridization states of the boron orbitals that form the B-B bonds and to the strength of the B-B bonds. This study provides a novel tool to study dynamics in ordered and disordered solids and provides new perspectives on electron-precise dianionic diboranes featuring two-center-two-electron bonds in the context of related compounds featuring multiply and singly bonded boron spin pairs.
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Affiliation(s)
- Y T Angel Wong
- Department of Chemistry and Biomolecular Sciences & Centre for Catalysis Research and Innovation, University of Ottawa , Ottawa, Ontario, Canada K1N6N5
| | - Johannes Landmann
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - Maik Finze
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
| | - David L Bryce
- Department of Chemistry and Biomolecular Sciences & Centre for Catalysis Research and Innovation, University of Ottawa , Ottawa, Ontario, Canada K1N6N5
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33
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Catão AJL, López-Castillo A. Stability and molecular properties of the boron-nitrogen alternating analogs of azulene and naphthalene: a computational study. J Mol Model 2017; 23:119. [PMID: 28299480 DOI: 10.1007/s00894-017-3279-y] [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] [Received: 09/14/2016] [Accepted: 02/13/2017] [Indexed: 11/25/2022]
Abstract
In this work, the spectroscopic information, stability and aromaticity of the boron-nitrogen azulene and naphthalene molecules are provided by the use of CC2 (geometry optimization, dipole moment, UV-vis spectrum calculations) and DFT (vibrational spectrum and NMR calculations) methodologies. One isomer of the investigated boron-nitrogen naphthalene (boroazanaphthalene) and two isomers of boron-nitrogen azulene, 1,3,4,6,8-pentaaza-2,3a,5,7,8a-pentaboraazulene (BN-azulene) and 2,3a,5,7,8a-pentaaza-1,3,4,6,8- pentaboraazulene (NB-azulene), are stable systems. However, these molecules have different properties, i.e., different stability, dipole moment, and aromaticity based on the NICS approach. BN-naphthalene has a high dipole moment magnitude showing high polar character, while naphthalene is apolar. BN- and NB-azulene are weakly polar, while ordinary azulene is highly polar in character. Also, substitution of C atoms by B and N atoms decreases the aromaticity. In the case of NB-azulene, the seven-membered ring has anti-aromaticity behavior while both rings of BN-azulene exhibit aromaticity. We expect that the new theoretical data provided in this work will be useful in identifying and characterizing experimentally the compounds investigated, and in helping our understanding of the chemistry of boron-nitrogen molecules. Graphical abstract Boron-nitrogen alternating analogs of azulene. Spectral distinction between isomers.
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Affiliation(s)
- Anderson José Lopes Catão
- Departamento de Química, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, 13560-970, Brazil.
| | - Alejandro López-Castillo
- Departamento de Química, Universidade Federal de São Carlos (UFSCar), São Carlos, SP, 13560-970, Brazil
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34
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Kong L, Lu W, Yongxin L, Ganguly R, Kinjo R. Formation of Boron–Main-Group Element Bonds by Reactions with a Tricoordinate Organoboron L2PhB: (L = Oxazol-2-ylidene). Inorg Chem 2017; 56:5586-5593. [DOI: 10.1021/acs.inorgchem.6b02993] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lingbing Kong
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Wei Lu
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Li Yongxin
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Rakesh Ganguly
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Rei Kinjo
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
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35
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Jaiswal K, Prashanth B, Singh S. Fine-Tuning of Lewis Acidity: The Case of Borenium Hydride Complexes Derived from Bis(phosphinimino)amide Boron Precursors. Chemistry 2016; 22:11035-41. [PMID: 27351275 DOI: 10.1002/chem.201600382] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2016] [Indexed: 11/11/2022]
Abstract
Reactions of bis(phosphinimino)amines LH and L'H with Me2 S⋅BH2 Cl afforded chloroborane complexes LBHCl (1) and L'BHCl (2), and the reaction of L'H with BH3 ⋅Me2 S gave a dihydridoborane complex L'BH2 (3) (LH=[{(2,4,6-Me3 C6 H2 N)P(Ph2 )}2 N]H and L'H=[{(2,6-iPr2 C6 H3 N)P(Ph2 )}2 N]H). Furthermore, abstraction of a hydride ion from L'BH2 (3) and LBH2 (4) mediated by Lewis acid B(C6 F5 )3 or the weakly coordinating ion pair [Ph3 C][B(C6 F5 )4 ] smoothly yielded a series of borenium hydride cations: [L'BH](+) [HB(C6 F5 )3 ](-) (5), [L'BH](+) [B(C6 F5 )4 ](-) (6), [LBH](+) [HB(C6 F5 )3 ](-) (7), and [LBH](+) [B(C6 F5 )4 ](-) (8). Synthesis of a chloroborenium species [LBCl](+) [BCl4 ](-) (9) without involvement of a weakly coordinating anion was also demonstrated from a reaction of LBH2 (4) with three equivalents of BCl3 . It is clear from this study that the sterically bulky strong donor bis(phosphinimino)amide ligand plays a crucial role in facilitating the synthesis and stabilization of these three-coordinated cationic species of boron. Therefore, the present synthetic approach is not dependent on the requirement of weakly coordinating anions; even simple BCl4 (-) can act as a counteranion with borenium cations. The high Lewis acidity of the boron atom in complex 8 enables the formation of an adduct with 4-dimethylaminopyridine (DMAP), [LBH⋅(DMAP)](+) [B(C6 F5 )4 ](-) (10). The solid-state structures of complexes 1, 5, and 9 were investigated by means of single-crystal X-ray structural analysis.
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Affiliation(s)
- Kuldeep Jaiswal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, SAS Nagar, Mohali, 140306, Punjab, India
| | - Billa Prashanth
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, SAS Nagar, Mohali, 140306, Punjab, India
| | - Sanjay Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research Mohali, Knowledge City, Sector 81, SAS Nagar, Mohali, 140306, Punjab, India.
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Arnold N, Braunschweig H, Ewing WC, Kupfer T, Radacki K, Thiess T, Trumpp A. Controlling Regiochemistry in the Syntheses of Boraindanes from Diborane(4) Starting Materials. Chemistry 2016; 22:11441-9. [DOI: 10.1002/chem.201601522] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Nicole Arnold
- 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
| | - William C. Ewing
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Thomas Kupfer
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Krzysztof Radacki
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Torsten Thiess
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Alexandra Trumpp
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
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Kong L, Lu W, Li Y, Ganguly R, Kinjo R. Isolation of a Diborane(6) Dication: Formation and Cleavage of an Electron-Precise B(sp3)–B(sp3) Bond. J Am Chem Soc 2016; 138:8623-9. [DOI: 10.1021/jacs.6b04858] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lingbing Kong
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Wei Lu
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Yongxin Li
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Rakesh Ganguly
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Rei Kinjo
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
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Devillard M, Mallet-Ladeira S, Bouhadir G, Bourissou D. Diverse reactivity of borenium cations with >N–H compounds. Chem Commun (Camb) 2016; 52:8877-80. [DOI: 10.1039/c6cc03183h] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The P-stabilized borenium 1 displays rich reactivity towards >N–H compounds: substitution reaction at a borenium center with Ph2NH, Lewis adduct formation and subsequent deprotonation with NH3, B–Mes cleavage and formation of a dicationic species with HNTf2.
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Affiliation(s)
| | - Sonia Mallet-Ladeira
- Université Paul Sabatier
- Institut de Chimie de Toulouse (FR 2599)
- 31062 Toulouse cedex 9
- France
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39
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Ghadwal RS. Carbon-based two electron σ-donor ligands beyond classical N-heterocyclic carbenes. Dalton Trans 2016; 45:16081-16095. [DOI: 10.1039/c6dt02158a] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Recent advances in N-heterocyclic carbene-derived carbon-based two electron σ-donor ligands are presented in this perspective.
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Affiliation(s)
- Rajendra S. Ghadwal
- Molecular Inorganic Chemistry and Catalysis
- Anorganische Chemie & Strukturchemie
- Fakultät für Chemie
- Universität Bielefeld
- Bielefeld
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40
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Dewhurst RD, Neeve EC, Braunschweig H, Marder TB. sp(2)-sp(3) diboranes: astounding structural variability and mild sources of nucleophilic boron for organic synthesis. Chem Commun (Camb) 2015; 51:9594-607. [PMID: 25912808 DOI: 10.1039/c5cc02316e] [Citation(s) in RCA: 202] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Despite the widespread use of organoborane reagents in organic synthesis and catalysis, a major challenge still remains: very few boron-centered nucleophiles exist for the direct construction of B-C bonds. Perhaps the most promising emerging solution to this problem is the use of sp(2)-sp(3) diboranes, in which one boron atom of a conventional diborane(4) is quaternised by either a neutral or anionic nucleophile. These compounds, either isolated or generated in situ, serve as relatively mild and convenient sources of the boryl anion [BR2](-) for use in organic synthesis and have already proven their efficacy in metal-free as well as metal-catalysed borylation reactions. This Feature article documents the history of sp(2)-sp(3) diborane synthesis, their properties and surprising structural variability, and their burgeoning utility in organic synthesis.
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Affiliation(s)
- Rian D Dewhurst
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
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Braunschweig H, Dewhurst RD, Mozo S. Building Electron-Precise BoronBoron Single Bonds: Imposing Monogamy on a Promiscuous Element. ChemCatChem 2015. [DOI: 10.1002/cctc.201500219] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Braunschweig H, Shang R. Reactivity of Transition-Metal Borylene Complexes: Recent Advances in B–C and B–B Bond Formation via Borylene Ligand Coupling. Inorg Chem 2015; 54:3099-106. [DOI: 10.1021/acs.inorgchem.5b00091] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Holger Braunschweig
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Rong Shang
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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43
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Ghadwal RS, Schürmann CJ, Andrada DM, Frenking G. Mono- and di-cationic hydrido boron compounds. Dalton Trans 2015. [DOI: 10.1039/c5dt02237a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Stable mono- and di-cationic hydrido boron compounds featuring CH2BH2(μ-H)BH2CH2 and CH2BH(μ-H)2BHCH2 cores are readily accessible by dehydrogenative hydride abstractions. NBO calculations revealed the occurrence of two B–H–B 3c–2e bonds in the HB(μ-H)2BH moiety of di-cations (7 and 8), where 43% is located at the H bridges and ∼28% at each boron atom.
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Affiliation(s)
- Rajendra S. Ghadwal
- Institut für Anorganische Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
- Institut für Anorganische Chemie der Georg-August-Universität Göttingen
| | - Christian J. Schürmann
- Institut für Anorganische Chemie der Georg-August-Universität Göttingen
- 37077 Göttingen
- Germany
| | - Diego M. Andrada
- Fachbereich Chemie
- Philipps-Universität Marburg
- 35032 Marburg
- Germany
| | - Gernot Frenking
- Fachbereich Chemie
- Philipps-Universität Marburg
- 35032 Marburg
- Germany
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44
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Saito M, Matsumoto K, Fujita M, Minoura M. Unexpected Dehalogenation Reactions of Dichloroborane Bearing a NCN-Pincer Ligand: Formation of a Borenium Salt. HETEROATOM CHEMISTRY 2014. [DOI: 10.1002/hc.21211] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Masaichi Saito
- Department of Chemistry; Graduate School of Science and Engineering; Saitama University; Sakura-ku Saitama 338-8570 Japan
| | - Kaori Matsumoto
- Department of Chemistry; Graduate School of Science and Engineering; Saitama University; Sakura-ku Saitama 338-8570 Japan
| | - Masahiro Fujita
- Department of Chemistry; Graduate School of Science and Engineering; Saitama University; Sakura-ku Saitama 338-8570 Japan
| | - Mao Minoura
- Department of Chemistry; College of Science; Rikkyo University; Toshima-ku Tokyo 171-8501 Japan
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Chen WC, Lee CY, Lin BC, Hsu YC, Shen JS, Hsu CP, Yap GPA, Ong TG. The Elusive Three-Coordinate Dicationic Hydrido Boron Complex. J Am Chem Soc 2014; 136:914-7. [DOI: 10.1021/ja4120852] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Wen-Ching Chen
- Institute
of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan, Republic of China
| | - Ching-Yu Lee
- Institute
of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan, Republic of China
- Department
of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, Republic of China
| | - Bo-Chao Lin
- Institute
of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan, Republic of China
| | - Yu-Chen Hsu
- Institute
of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan, Republic of China
| | - Jiun-Shian Shen
- Institute
of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan, Republic of China
| | - Chao-Ping Hsu
- Institute
of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan, Republic of China
| | - Glenn P. A. Yap
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Tiow-Gan Ong
- Institute
of Chemistry, Academia Sinica, Nangang, Taipei, Taiwan, Republic of China
- The
Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan, Republic of China
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Prokofjevs A, Kampf JW, Solovyev A, Curran DP, Vedejs E. Weakly stabilized primary borenium cations and their dicationic dimers. J Am Chem Soc 2013; 135:15686-9. [PMID: 24087933 PMCID: PMC3857331 DOI: 10.1021/ja407458k] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Hydride abstraction from monocationic hydride bridged salts [H(H2B-L)2](+) [B(C6F5)4]¯ (L = Lewis base) generates an observable primary borenium cation for L = iPr2NEt, but with L = Me3N, Me2NPr, or several N-heterocyclic carbenes, highly reactive dicationic dimers are formed.
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Affiliation(s)
| | - Jeff W. Kampf
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
| | - Andrey Solovyev
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260
| | - Dennis P. Curran
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260
| | - Edwin Vedejs
- Department of Chemistry, University of Michigan, Ann Arbor, MI 48109
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47
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A boron–boron coupling reaction between two ethyl cation analogues. Nat Chem 2013; 5:1029-34. [DOI: 10.1038/nchem.1776] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2013] [Accepted: 09/04/2013] [Indexed: 11/08/2022]
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48
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Jones C, Stasch A. Stable Molecular Magnesium(I) Dimers: A Fundamentally Appealing Yet Synthetically Versatile Compound Class. TOP ORGANOMETAL CHEM 2013. [DOI: 10.1007/978-3-642-36270-5_3] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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49
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Pospiech S, Brough S, Bolte M, Lerner HW, Bettinger HF, Wagner M. An inorganic propellane with central B–B bond. Chem Commun (Camb) 2012; 48:5886-8. [DOI: 10.1039/c2cc32256k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Kinjo R, Donnadieu B, Celik MA, Frenking G, Bertrand G. Synthesis and Characterization of a Neutral Tricoordinate Organoboron Isoelectronic with Amines. Science 2011; 333:610-3. [DOI: 10.1126/science.1207573] [Citation(s) in RCA: 451] [Impact Index Per Article: 34.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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