1
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Bao CC, Luo YL, Du HZ, Guan BT. Benzylic aroylation of toluenes with unactivated tertiary benzamides promoted by directed ortho-lithiation. Sci China Chem 2021. [DOI: 10.1007/s11426-021-1035-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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2
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Protchenko AV, Vasko P, Fuentes MÁ, Hicks J, Vidovic D, Aldridge S. Approaching a "Naked" Boryl Anion: Amide Metathesis as a Route to Calcium, Strontium, and Potassium Boryl Complexes. Angew Chem Int Ed Engl 2021; 60:2064-2068. [PMID: 33026153 PMCID: PMC7894291 DOI: 10.1002/anie.202011839] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Indexed: 11/08/2022]
Abstract
Amide metathesis has been used to generate the first structurally characterized boryl complexes of calcium and strontium, {(Me3 Si)2 N}M{B(NDippCH)2 }(thf)n (M=Ca, n=2; M=Sr, n=3), through the reactions of the corresponding bis(amides), M{N(SiMe3 )2 }2 (thf)2 , with (thf)2 Li- {B(NDippCH)2 }. Most notably, this approach can also be applied to the analogous potassium amide K{N(SiMe3 )2 }, leading to the formation of the solvent-free borylpotassium dimer [K{B(NDippCH)2 }]2 , which is stable in the solid state at room temperature for extended periods (48 h). A dimeric structure has been determined crystallographically in which the K+ cations interact weakly with both the ipso-carbons of the flanking Dipp groups and the boron centres of the diazaborolyl heterocycles, with K⋅⋅⋅B distances of >3.1 Å. These structural features, together with atoms in molecules (QTAIM) calculations imply that the boron-containing fragment closely approaches a limiting description as a "free" boryl anion in the condensed phase.
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Affiliation(s)
- Andrey V. Protchenko
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
| | - Petra Vasko
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
- Department of Chemistry, Nanoscience CenterUniversity of JyväskyläP. O. Box 3540014JyväskyläFinland
| | - M. Ángeles Fuentes
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
| | - Jamie Hicks
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
| | - Dragoslav Vidovic
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
| | - Simon Aldridge
- Inorganic Chemistry LaboratoryDepartment of ChemistryUniversity of OxfordSouth Parks RoadOxfordOX1 3QRUK
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3
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Protchenko AV, Vasko P, Fuentes MÁ, Hicks J, Vidovic D, Aldridge S. Approaching a “Naked” Boryl Anion: Amide Metathesis as a Route to Calcium, Strontium, and Potassium Boryl Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202011839] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Andrey V. Protchenko
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
| | - Petra Vasko
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
- Department of Chemistry, Nanoscience Center University of Jyväskylä P. O. Box 35 40014 Jyväskylä Finland
| | - M. Ángeles Fuentes
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
| | - Jamie Hicks
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
| | - Dragoslav Vidovic
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
| | - Simon Aldridge
- Inorganic Chemistry Laboratory Department of Chemistry University of Oxford South Parks Road Oxford OX1 3QR UK
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4
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Kurumada S, Sugita K, Nakano R, Yamashita M. A meta-Selective C-H Alumination of Mono-Substituted Benzene by Using An Alkyl-Substituted Al Anion through Hydride-Eliminating S N Ar Reaction. Angew Chem Int Ed Engl 2020; 59:20381-20384. [PMID: 32729647 DOI: 10.1002/anie.202009138] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Indexed: 11/10/2022]
Abstract
Reaction of an Al-centered anion with toluene proceeded to form C-H cleaved product with a perfect meta-selectivity and a relatively small kinetic isotope effect (KIE, kH /kD =1.51). DFT calculations suggested a two-step reaction mechanism and electronically controlled meta-selectivity arising from the electron-donating methyl group. The reaction with other mono-substituted arenes was also investigated.
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Affiliation(s)
- Satoshi Kurumada
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan
| | - Kengo Sugita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan
| | - Ryo Nakano
- 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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5
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Kurumada S, Sugita K, Nakano R, Yamashita M. A
meta
‐Selective C−H Alumination of Mono‐Substituted Benzene by Using An Alkyl‐Substituted Al Anion through Hydride‐Eliminating S
N
Ar Reaction. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009138] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Satoshi Kurumada
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University, Furo-cho, Chikusa-ku Nagoya Aichi 464-8603 Japan
| | - Kengo Sugita
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University, Furo-cho, Chikusa-ku Nagoya Aichi 464-8603 Japan
| | - Ryo Nakano
- 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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6
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Liu Z, Cui C. Reaction of a boryl anion with silicon halides and alkoxysilanes: Synthesis of borylsilanes. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2019.121041] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Zhao Q, Dewhurst RD, Braunschweig H, Chen X. Boranchemie aus einer neuen Perspektive: Nukleophilie der B-H-Bindungselektronen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201809733] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Qianyi Zhao
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
| | - Rian D. Dewhurst
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Holger Braunschweig
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Xuenian Chen
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou Henan 450001 China
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8
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Zhao Q, Dewhurst RD, Braunschweig H, Chen X. A New Perspective on Borane Chemistry: The Nucleophilicity of the B−H Bonding Pair Electrons. Angew Chem Int Ed Engl 2019; 58:3268-3278. [DOI: 10.1002/anie.201809733] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 10/22/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Qianyi Zhao
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
| | - Rian D. Dewhurst
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Xuenian Chen
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou Henan 450001 China
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9
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Abstract
The study of main-group molecules that behave and react similarly to transition-metal (TM) complexes has attracted significant interest in recent decades. Most notably, the attractive idea of replacing the all-too-often rare and costly metals from catalysis has motivated efforts to develop main-group-element-mediated reactions. Main-group elements, however, lack the electronic flexibility of TM complexes that arises from combinations of empty and filled d orbitals and that seem ideally suited to bind and activate many substrates. In this review, we look at boron, an element that despite its nonmetal nature, low atomic weight, and relative redox staticity has achieved great milestones in terms of TM-like reactivity. We show how in interelement cooperative systems, diboron molecules, and hypovalent complexes the fifth element can acquire a truly metallomimetic character. As we discuss, this character is powerfully demonstrated by the reactivity of boron-based molecules with H2, CO, alkynes, alkenes and even with N2.
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10
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11
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Su Y, Li Y, Ganguly R, Kinjo R. Engineering the Frontier Orbitals of a Diazadiborinine for Facile Activation of H2
, NH3
, and an Isonitrile. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803938] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuanting Su
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Rakesh Ganguly
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - 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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12
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Su Y, Li Y, Ganguly R, Kinjo R. Engineering the Frontier Orbitals of a Diazadiborinine for Facile Activation of H2
, NH3
, and an Isonitrile. Angew Chem Int Ed Engl 2018; 57:7846-7849. [DOI: 10.1002/anie.201803938] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Yuanting Su
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Rakesh Ganguly
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - 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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13
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Araki T, Hirai M, Wakamiya A, Piers WE, Yamaguchi S. Antiaromatic Dithieno-1,2-dihydro-1,2-diborin Splits Diatomic Hydrogen. CHEM LETT 2017. [DOI: 10.1246/cl.170812] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Takafumi Araki
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8602
| | - Masato Hirai
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8601
| | - Atsushi Wakamiya
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011
| | - Warren E. Piers
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Shigehiro Yamaguchi
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8602
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo, Chikusa, Nagoya, Aichi 464-8601
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14
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Wang H, Wu L, Lin Z, Xie Z. Synthesis, Structure and Reactivity of a Borylene Cation [(NHSi) 2B(CO)] + Stabilized by Three Neutral Ligands. J Am Chem Soc 2017; 139:13680-13683. [PMID: 28885010 DOI: 10.1021/jacs.7b08667] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A borylene cation stabilized by bis(silylene) and carbon monoxide was prepared and structurally characterized via the reaction of bis(silylene)-stabilized bromoborylene with W(CO)6. This is the first example of a borylene cation coordinated by three neutral ligands, which can be viewed as a cationic form of a long-sought Lewis base-stabilized zerovalent boron compound. This cation can cleave dihydrogen.
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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
| | - Linlin Wu
- Department of Chemistry, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong, China
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, 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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15
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Landmann J, Hennig PT, Ignat'ev NV, Finze M. Borylation of fluorinated arenes using the boron-centred nucleophile B(CN) 32- - a unique entry to aryltricyanoborates. Chem Sci 2017; 8:5962-5968. [PMID: 28989626 PMCID: PMC5620525 DOI: 10.1039/c7sc02249b] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 06/24/2017] [Indexed: 01/07/2023] Open
Abstract
The potassium salt of the boron-centred nucleophile B(CN)32- (1) readily reacts with perfluorinated arenes, such as hexafluorobenzene, decafluorobiphenyl, octafluoronaphthalene and pentafluoropyridine, which results in KF and the K+ salts of the respective borate anions with one {B(CN)3} unit bonded to the (hetero)arene. An excess of K21 leads to the successive reaction of two or, in the case of perfluoropyridine, even three C-F moieties and the formation of di- and trianions, respectively. Moreover, all of the 11 partially fluorinated benzene derivatives, C6F6-n H n (n = 1-5), generally react with K21 to give new tricyano(phenyl)borate anions with high chemo- and regioselectivity. A decreasing number of fluorine substituents on benzene results in a decrease in the reaction rate. In the cases of partially fluorinated benzenes, the addition of LiCl is advantageous or even necessary to facilitate the reaction. Also, pentafluorobenzenes R-C6F5 (R = -CN, -OMe, -Me, or -CF3) react via C-F/C-B exchange that mostly occurs in the para position and to a lesser extent in the meta or ortho positions. Most of the reactions proceed via an SNAr mechanism. The reaction of 1,4-F2C6H4 with K21 shows that an aryne mechanism has to be considered in some cases as well. In summary, a wealth of new stable tricyano(aryl)borates have been synthesised and fully characterized using multi-NMR spectroscopy and most of them were characterised using single-crystal X-ray diffraction.
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Affiliation(s)
- Johannes Landmann
- Institut für Anorganische Chemie , Institut für nachhaltige Chemie & Katalyse mit Bor (ICB) , Julius-Maximilians Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . https://go.uniwue.de/finze-group ;
| | - Philipp T Hennig
- Institut für Anorganische Chemie , Institut für nachhaltige Chemie & Katalyse mit Bor (ICB) , Julius-Maximilians Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . https://go.uniwue.de/finze-group ;
| | | | - Maik Finze
- Institut für Anorganische Chemie , Institut für nachhaltige Chemie & Katalyse mit Bor (ICB) , Julius-Maximilians Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . https://go.uniwue.de/finze-group ;
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16
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1,3,2‐Diazaborolyl Anions – From Laboratory Curiosities to Versatile Reagents in Synthesis. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700629] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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17
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Stephan DW. Eine Geschichte über zwei Elemente: die Umpolung der Lewis-Acidität/Basizität von Bor und Phosphor. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700721] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Douglas W. Stephan
- Department of Chemistry; University of Toronto; 80 St. George St Toronto Ontario M5S3H6 Kanada
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18
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Stephan DW. A Tale of Two Elements: The Lewis Acidity/Basicity Umpolung of Boron and Phosphorus. Angew Chem Int Ed Engl 2017; 56:5984-5992. [DOI: 10.1002/anie.201700721] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Douglas W. Stephan
- Department of Chemistry; University of Toronto; 80 St. George St Toronto Ontario M5S3H6 Canada
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19
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Tsukahara N, Asakawa H, Lee KH, Lin Z, Yamashita M. Cleaving Dihydrogen with Tetra(o-tolyl)diborane(4). J Am Chem Soc 2017; 139:2593-2596. [DOI: 10.1021/jacs.7b00924] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nana Tsukahara
- Department
of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27, Kasuga, Bunkyo-ku, 112-8551 Tokyo, Japan
| | - Hiroki Asakawa
- Department
of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27, Kasuga, Bunkyo-ku, 112-8551 Tokyo, Japan
| | - Ka-Ho Lee
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water
Bay, Kowloon 999077, Hong Kong
| | - Zhenyang Lin
- Department
of Chemistry, The Hong Kong University of Science and Technology, Clear Water
Bay, Kowloon 999077, Hong Kong
| | - Makoto Yamashita
- Department
of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho,
Chikusa-ku, Nagoya, 464-8603 Aichi, Japan
- Research
Development Initiative, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, 112-8551 Tokyo, Japan
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20
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Asami SS, Ishida S, Iwamoto T, Suzuki K, Yamashita M. Isolation and Characterization of Radical Anions Derived from a Boryl-Substituted Diphosphene. Angew Chem Int Ed Engl 2017; 56:1658-1662. [PMID: 28106347 DOI: 10.1002/anie.201611762] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Indexed: 11/08/2022]
Abstract
Radical anions of a diphosphene with two boryl substituents were isolated and characterized by single-crystal X-ray diffraction, electron spin resonance (ESR), and UV/Vis absorption spectroscopy as well as DFT calculations. Structural analysis of the radical anions revealed an elongation of the P=P bond and a contraction of the B-P bonds relative to the neutral diphosphene. The UV/Vis spectra of these radical anions showed a strong absorption in the visible region, which was assigned to SOMO-related transitions on the basis of DFT calculations. The ESR spectra revealed that the hyperfine coupling constant with the phosphorus nuclei is the smallest that has been reported thus far. The results of the DFT calculations furthermore suggest that this should be attributed to a soaking of electron spin to the vacant p orbitals of the boryl substituents.
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Affiliation(s)
- Shun-Suke Asami
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Shintaro Ishida
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
| | - Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Makoto Yamashita
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan.,Research Development Initiative, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, T, okyo, 112-8551, Japan
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21
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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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22
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Landmann J, Keppner F, Hofmann DB, Sprenger JAP, Häring M, Zottnick SH, Müller-Buschbaum K, Ignat'ev NV, Finze M. Deprotonierung eines Hydridoborat-Anions. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611899] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Johannes Landmann
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Fabian Keppner
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Daniel B. Hofmann
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Jan A. P. Sprenger
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Mathias Häring
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Sven H. Zottnick
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Klaus Müller-Buschbaum
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | | | - Maik Finze
- Institut für Anorganische Chemie; Institut für nachhaltige Chemie & Katalyse mit Bor (ICB); Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
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23
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Landmann J, Keppner F, Hofmann DB, Sprenger JAP, Häring M, Zottnick SH, Müller-Buschbaum K, Ignat'ev NV, Finze M. Deprotonation of a Hydridoborate Anion. Angew Chem Int Ed Engl 2017; 56:2795-2799. [PMID: 28117532 DOI: 10.1002/anie.201611899] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Indexed: 11/07/2022]
Abstract
The first deprotonation of a borohydride anion was achieved by treatment of [BH(CN)3 ]- with strong non-nucleophilic bases, which resulted in the formation of alkali-metal salts of the tricyanoborate dianion B(CN)32- in up to 97 % yield and 99.5 % purity. [BH(CN)3 ]- is less acidic than (Me3 Si)2 NH but a stronger acid than iPr2 NH. Less sterically hindered, more nucleophilic bases such as PhLi and MeLi mostly attack a CN group under formation of imine dianions [RC(N)B(CN)3 ]2- , which can be hydrolyzed to ketones of the [RC(O)B(CN)3 ]- type. The boron-centered nucleophile B(CN)32- reacts with CO2 and CN+ reagents to give salts of the [B(CN)3 CO2 ]2- dianion and the tetracyanoborate anion [B(CN)4 ]- , respectively, in excellent yields.
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Affiliation(s)
- Johannes Landmann
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Fabian Keppner
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Daniel B Hofmann
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Jan A P Sprenger
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Mathias Häring
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Sven H Zottnick
- Institut für Anorganische Chemie, Institut für nachhaltige Chemie & Katalyse mit Bor (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Klaus Müller-Buschbaum
- 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
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24
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Asami SS, Ishida S, Iwamoto T, Suzuki K, Yamashita M. Isolation and Characterization of Radical Anions Derived from a Boryl-Substituted Diphosphene. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611762] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shun-suke Asami
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Shintaro Ishida
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan
| | - Takeaki Iwamoto
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Makoto Yamashita
- Department of Applied Chemistry; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa-ku, Nagoya Aichi 464-8603 Japan
- Research Development Initiative; Chuo University; 1-13-27 Kasuga, Bunkyo-ku, T okyo 112-8551 Japan
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25
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Asami SS, Okamoto M, Suzuki K, Yamashita M. A Boryl-Substituted Diphosphene: Synthesis, Structure, and Reaction with n-Butyllithium To Form a Stabilized Adduct by pπ-pπ Interaction. Angew Chem Int Ed Engl 2016; 55:12827-31. [PMID: 27629120 DOI: 10.1002/anie.201607995] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Indexed: 11/12/2022]
Abstract
A boryl-substituted diphosphene was synthesized through the nucleophilic borylation of PCl3 with a borylzinc reagent, followed by a reduction with Mg. A combined analysis of the resulting diboryldiphosphene by single-crystal X-ray diffraction, DFT calculations, and UV/Vis spectroscopy revealed a σ-electron-donating effect for the boryl substituent that was slightly weaker than that of the 2,4,6-tri-tert-butylphenyl (Mes*) ligand. The reaction of this diboryldiphosphene with (n) BuLi afforded a boryl-substituted phosphinophosphide that was, in comparison with the thermally unstable Mes*-substituted diaryldiphosphene, stabilized by a π-electron-accepting effect of the boryl substituent.
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Affiliation(s)
- Shun-Suke Asami
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Masafumi Okamoto
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Makoto Yamashita
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan.
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26
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Asami SS, Okamoto M, Suzuki K, Yamashita M. A Boryl-Substituted Diphosphene: Synthesis, Structure, and Reaction withn-Butyllithium To Form a Stabilized Adduct by pπ-pπ Interaction. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607995] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shun-suke Asami
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Masafumi Okamoto
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Makoto Yamashita
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
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27
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Ohsato T, Okuno Y, Ishida S, Iwamoto T, Lee K, Lin Z, Yamashita M, Nozaki K. A Potassium Diboryllithate: Synthesis, Bonding Properties, and the Deprotonation of Benzene. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Takuto Ohsato
- Department of Applied Chemistry, Faculty of Science and Engineering Chuo University 1-13-27 Kasuga, Bunkyo-ku 112-8551 Tokyo Japan
| | - Yuri Okuno
- Department of Chemistry and Biotechnology, Graduate School of Engineering The University of Tokyo 7-3-1 Hongo, Bunkyo-ku 113-8656 Tokyo Japan
| | - Shintaro Ishida
- Department of Chemistry, Graduate School of Science Tohoku University 980-8578 Sendai Japan
| | - Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science Tohoku University 980-8578 Sendai Japan
| | - Ka‐Ho Lee
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong
| | - Zhenyang Lin
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong
| | - Makoto Yamashita
- Department of Applied Chemistry, Faculty of Science and Engineering Chuo University 1-13-27 Kasuga, Bunkyo-ku 112-8551 Tokyo Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering The University of Tokyo 7-3-1 Hongo, Bunkyo-ku 113-8656 Tokyo Japan
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28
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Ohsato T, Okuno Y, Ishida S, Iwamoto T, Lee K, Lin Z, Yamashita M, Nozaki K. A Potassium Diboryllithate: Synthesis, Bonding Properties, and the Deprotonation of Benzene. Angew Chem Int Ed Engl 2016; 55:11426-30. [DOI: 10.1002/anie.201605005] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Revised: 07/19/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Takuto Ohsato
- Department of Applied Chemistry, Faculty of Science and Engineering Chuo University 1-13-27 Kasuga, Bunkyo-ku 112-8551 Tokyo Japan
| | - Yuri Okuno
- Department of Chemistry and Biotechnology, Graduate School of Engineering The University of Tokyo 7-3-1 Hongo, Bunkyo-ku 113-8656 Tokyo Japan
| | - Shintaro Ishida
- Department of Chemistry, Graduate School of Science Tohoku University 980-8578 Sendai Japan
| | - Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science Tohoku University 980-8578 Sendai Japan
| | - Ka‐Ho Lee
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong
| | - Zhenyang Lin
- Department of Chemistry The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong
| | - Makoto Yamashita
- Department of Applied Chemistry, Faculty of Science and Engineering Chuo University 1-13-27 Kasuga, Bunkyo-ku 112-8551 Tokyo Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering The University of Tokyo 7-3-1 Hongo, Bunkyo-ku 113-8656 Tokyo Japan
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29
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Lu W, Hu H, Li Y, Ganguly R, Kinjo R. Isolation of 1,2,4,3-Triazaborol-3-yl-metal (Li, Mg, Al, Au, Zn, Sb, Bi) Derivatives and Reactivity toward CO and Isonitriles. J Am Chem Soc 2016; 138:6650-61. [DOI: 10.1021/jacs.6b03432] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Wei Lu
- Division of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Haitao Hu
- 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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30
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Yamashita M. The Organometallic Chemistry of Boron-Containing Pincer Ligands based on Diazaboroles and Carboranes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150355] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Makoto Yamashita
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University
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31
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Kisu H, Sakaino H, Ito F, Yamashita M, Nozaki K. A Qualitative Analysis of a “Bora-Brook Rearrangement”: The Ambident Reactivity of Boryl-Substituted Alkoxide Including the Carbon-to-Oxygen Migration of a Boryl Group. J Am Chem Soc 2016; 138:3548-52. [DOI: 10.1021/jacs.6b00283] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Haruki Kisu
- Department of Applied Chemistry, Faculty
of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, 112-8551 Tokyo, Japan
| | - Hirotoshi Sakaino
- Department of Chemistry and Biotechnology, Graduate School
of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan
| | - Fumihiro Ito
- Department of Chemistry and Biotechnology, Graduate School
of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan
| | - Makoto Yamashita
- Department of Applied Chemistry, Faculty
of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, 112-8551 Tokyo, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School
of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan
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32
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Campos J, Aldridge S. Catalytic Borylation using an Air‐Stable Zinc Boryl Reagent: Systematic Access to Elusive Acylboranes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507627] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jesús Campos
- Inorganic Chemistry Laboratory, Dept. of Chemistry, University of Oxford, South Parks Rd, Oxford (UK) OX1 3QR
| | - Simon Aldridge
- Inorganic Chemistry Laboratory, Dept. of Chemistry, University of Oxford, South Parks Rd, Oxford (UK) OX1 3QR
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33
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Campos J, Aldridge S. Catalytic Borylation using an Air-Stable Zinc Boryl Reagent: Systematic Access to Elusive Acylboranes. Angew Chem Int Ed Engl 2015; 54:14159-63. [DOI: 10.1002/anie.201507627] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Indexed: 12/11/2022]
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34
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Wang G, Xu L, Li P. Double N,B-Type Bidentate Boryl Ligands Enabling a Highly Active Iridium Catalyst for C–H Borylation. J Am Chem Soc 2015; 137:8058-61. [DOI: 10.1021/jacs.5b05252] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Guanghui Wang
- Center for Organic Chemistry,
Frontier Institute of Science and Technology (FIST), Xi’an Jiaotong University, 99 Yanxiang Road, Xi’an, Shaanxi 710054, China
| | - Liang Xu
- Center for Organic Chemistry,
Frontier Institute of Science and Technology (FIST), Xi’an Jiaotong University, 99 Yanxiang Road, Xi’an, Shaanxi 710054, China
| | - Pengfei Li
- Center for Organic Chemistry,
Frontier Institute of Science and Technology (FIST), Xi’an Jiaotong University, 99 Yanxiang Road, Xi’an, Shaanxi 710054, China
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35
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Pietsch S, Neeve EC, Apperley DC, Bertermann R, Mo F, Qiu D, Cheung MS, Dang L, Wang J, Radius U, Lin Z, Kleeberg C, Marder TB. Synthesis, Structure, and Reactivity of Anionic sp2-sp3Diboron Compounds: Readily Accessible Boryl Nucleophiles. Chemistry 2015; 21:7082-98. [DOI: 10.1002/chem.201500235] [Citation(s) in RCA: 152] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Indexed: 01/20/2023]
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36
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Asakawa H, Lee KH, Furukawa K, Lin Z, Yamashita M. Lowering the reduction potential of a boron compound by means of the substituent effect of the boryl group: one-electron reduction of an unsymmetrical diborane(4). Chemistry 2015; 21:4267-71. [PMID: 25639658 DOI: 10.1002/chem.201406609] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Indexed: 11/11/2022]
Abstract
We have clarified and observed the high electron affinity of pinB-BMes2 (1; Mes = mesityl, pin = pinacolato). By using electrochemistry, it was shown that 1 has a higher electron affinity than those of B2pin2 and Mes3B. One-electron reduction of 1 gave the corresponding radical anion. The ESR spectroscopy and DFT calculation revealed the unsymmetrical distribution of electron density over the B-B bond. UV/Vis spectroscopy showed that the SOMO-related absorption supports the deep purple color of the radical anion. DFT studies on the torsion angle dependency of the LUMO levels and relative energies revealed the reason why 1 has high electron affinity as a result of the substituent effect of the Bpin group.
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Affiliation(s)
- Hiroki Asakawa
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27, Kasuga, Bunkyo-ku, 112-8551 Tokyo (Japan) http://www.chem.chuo-u.ac.jp/∼element/index-e.html
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37
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38
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Kong L, Li Y, Ganguly R, Vidovic D, Kinjo R. Isolation of a Bis(oxazol-2-ylidene)-Phenylborylene Adduct and its Reactivity as a Boron-Centered Nucleophile. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201405201] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Kong L, Li Y, Ganguly R, Vidovic D, Kinjo R. Isolation of a Bis(oxazol-2-ylidene)-Phenylborylene Adduct and its Reactivity as a Boron-Centered Nucleophile. Angew Chem Int Ed Engl 2014; 53:9280-3. [DOI: 10.1002/anie.201405201] [Citation(s) in RCA: 120] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Indexed: 11/08/2022]
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