101
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Pécharman A, Hill MS, Mahon MF. Synthesis of Unsymmetrical Diboranes by Diborane Metathesis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803607] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | | | - Mary F. Mahon
- Department of ChemistryUniversity of Bath Bath BA2 7AY UK
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102
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Pécharman AF, Hill MS, Mahon MF. Diborane heterolysis: breaking and making B-B bonds at magnesium. Dalton Trans 2018; 47:7300-7305. [PMID: 29770411 DOI: 10.1039/c8dt01451e] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Reaction of the dimeric β-diketiminato magnesium hydride [(BDI)MgH]2 (BDI = HC{(Me)CN-2,6-i-Pr2C6H3}2) with bis-pinacolatodiborane (B2pin2) resulted in B-O bond activation and formation of a magnesium complex of an unusual borylborohydride anion. In contrast, similar treatment of the mononuclear organomagnesium [{BDI}Mg(n-Bu)] with 4,4,4',4',6,6'-hexamethyl-2,2'-bi(1,3,2-dioxaborinane) (B2hex2) provided a B(sp2)-B(sp3) diborane anion, [(hex)BB(n-Bu)(hex)]-, with a constitution which is analogous to that formed in the previously reported reaction with bis(pinacolato)diboron (B2pin2). Subsequent addition of 4-dimethylaminopyridine to a solution of this compound induced alkylborane displacement and provided a magnesium boryl derivative containing a terminal Mg-B(hex) interaction (Mg-B 2.319(3) Å), a result which reinforces the generality of this approach for the synthesis of boryl anions by B-B bond heterolysis. Further studies of the reactivity of the initially formed B(sp2)-B(sp3) anions with diborane small molecules also resulted in alkylborane displacement and the production of triboron anions, which are propagated by contiguous and electron precise (2c-2e) B-B-B interactions.
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103
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Kaese T, Trageser T, Budy H, Bolte M, Lerner HW, Wagner M. A redox-active diborane platform performs C(sp 3)-H activation and nucleophilic substitution reactions. Chem Sci 2018; 9:3881-3891. [PMID: 29780520 PMCID: PMC5942040 DOI: 10.1039/c8sc00743h] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 03/19/2018] [Indexed: 12/19/2022] Open
Abstract
Targeted C(sp3)–H activation or nucleophilic substitution reactions have been achieved through the interaction of a diborane dianion with haloalkanes.
Organoboranes are among the most versatile and widely used reagents in synthetic chemistry. A significant further expansion of their application spectrum would be achievable if boron-containing reactive intermediates capable of inserting into C–H bonds or performing nucleophilic substitution reactions were readily available. However, current progress in the field is still hampered by a lack of universal design concepts and mechanistic understanding. Herein we report that the doubly arylene-bridged diborane(6) 1H2 and its B
Created by potrace 1.16, written by Peter Selinger 2001-2019
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B-bonded formal deprotonation product Li2[1] can activate the particularly inert C(sp3)–H bonds of added H3CLi and H3CCl, respectively. The first case involves the attack of [H3C]– on a Lewis-acidic boron center, whereas the second case follows a polarity-inverted pathway with nucleophilic attack of the B
Created by potrace 1.16, written by Peter Selinger 2001-2019
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B double bond on H3CCl. Mechanistic details were elucidated by means of deuterium-labeled reagents, a radical clock, α,ω-dihaloalkane substrates, the experimental identification of key intermediates, and quantum-chemical calculations. It turned out that both systems, H3CLi/1H2 and H3CCl/Li2[1], ultimately funnel into the same reaction pathway, which likely proceeds past a borylene-type intermediate and requires the cooperative interaction of both boron atoms.
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Affiliation(s)
- Thomas Kaese
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , D-60438 Frankfurt am Main , Germany .
| | - Timo Trageser
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , D-60438 Frankfurt am Main , Germany .
| | - Hendrik Budy
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , D-60438 Frankfurt am Main , Germany .
| | - Michael Bolte
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , D-60438 Frankfurt am Main , Germany .
| | - Hans-Wolfram Lerner
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , D-60438 Frankfurt am Main , Germany .
| | - Matthias Wagner
- Institut für Anorganische und Analytische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Straße 7 , D-60438 Frankfurt am Main , Germany .
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104
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Oschmann W, Borner C, Kleeberg C. Unsymmetrical diborane(4) derivatives by copper mediated B-B coupling. Dalton Trans 2018; 47:5318-5327. [PMID: 29589025 DOI: 10.1039/c8dt00627j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A novel, versatile and modular route to unsymmetrical diborane(4) derivatives bearing either two different diol moieties or one diol and one diamine moiety is presented. Utilising the very basic approach of reacting a boron nucleophile with a boron electrophile to establish the B-B bond allows a simple variation of the two individual boron moieties. The copper(i) boryl complexes used as nucleophilic boron sources are readily accessible from commercially available symmetrical diborane(4) derivatives, whilst equally readily available boron halide derivatives are used as electrophiles. Seven previously inaccessible diborane(4) derivatives were obtained and fully characterised, including single crystal X-ray structure determinations, illustrating the broad scope of the method.
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Affiliation(s)
- W Oschmann
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig, Germany.
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105
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Schwamm RJ, Anker MD, Lein M, Coles MP, Fitchett CM. Indyllithium and the Indyl Anion [InL]−
: Heavy Analogues of N-Heterocyclic Carbenes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201802444] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ryan J. Schwamm
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Mathew D. Anker
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Matthias Lein
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Martyn P. Coles
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Christopher M. Fitchett
- Department of Chemistry; University of Canterbury; Private Bag 4800 Christchurch 8041 New Zealand
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106
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Schwamm RJ, Anker MD, Lein M, Coles MP, Fitchett CM. Indyllithium and the Indyl Anion [InL]−
: Heavy Analogues of N-Heterocyclic Carbenes. Angew Chem Int Ed Engl 2018; 57:5885-5887. [DOI: 10.1002/anie.201802444] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Ryan J. Schwamm
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Mathew D. Anker
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Matthias Lein
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Martyn P. Coles
- School of Chemical and Physical Sciences; Victoria University of Wellington; PO Box 600 Wellington 6012 New Zealand
| | - Christopher M. Fitchett
- Department of Chemistry; University of Canterbury; Private Bag 4800 Christchurch 8041 New Zealand
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107
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Lu W, Li Y, Ganguly R, Kinjo R. Boron Analogue of Vinylidene Dication Supported by Phosphines. J Am Chem Soc 2018; 140:1255-1258. [DOI: 10.1021/jacs.7b13068] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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
| | - 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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108
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Morgan MM, Rautiainen JM, Piers WE, Tuononen HM, Gendy C. Divergent reactivity of nucleophilic 1-bora-7a-azaindenide anions. Dalton Trans 2018; 47:734-741. [PMID: 29239418 DOI: 10.1039/c7dt04350c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The reactions of 1-bora-7a-azaindenide anions, prepared in moderate to excellent yields by reduction of the appropriate 1-bora-7a-azaindenyl chlorides with KC8 in THF, with alkyl halides and carbon dioxide were studied. With alkyl halides (CH2Cl2, CH3I and BrCH(D)CH(D)tBu), the anions behave as boron anions, alkylating the boron centre via a classic SN2 mechanism. This was established with DFT methods and via experiments utilizing the neo-hexyl stereoprobe BrCH(D)CH(D)tBu. These reactions were in part driven by a re-aromatization of the six membered pyridyl ring upon formation of the product. Conversely, in the reaction of the 1-bora-7a-azaindenide anions with CO2, a novel carboxylation of the C-2 carbon alpha to boron was observed. Computations indicated that while carboxylation of the boron centre was kinetically feasible, the products of B-carboxylation were not thermodynamically favored relative to the observed C-2 carboxylated species, which were formed preferably due to the generation of both C-C and B-O bonds. In these products, the pyridyl ring remains non-aromatic, in part accounting for the observed reversibility of carboxylation.
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Affiliation(s)
- Matthew M Morgan
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
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109
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Niu H, Mangan RJ, Protchenko AV, Phillips N, Unkrig W, Friedmann C, Kolychev EL, Tirfoin R, Hicks J, Aldridge S. Experimental and quantum chemical studies of anionic analogues of N-heterocyclic carbenes. Dalton Trans 2018; 47:7445-7455. [DOI: 10.1039/c8dt01661e] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A combination of quantum chemical and synthetic/crystallographic methods have been employed to probe electronic structure in two series of anionic ligands related to the well-known NHC donor class.
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110
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Schorpp M, Rein S, Weber S, Scherer H, Krossing I. Guilty and charged: a stable solution of the hexamethylbenzene radical cation as a ligand forming oxidising agent. Chem Commun (Camb) 2018; 54:10036-10039. [PMID: 30063051 DOI: 10.1039/c8cc04690e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Arene radical cations as oxidising agents with intended non-innocent behaviour for the synthesis of subvalent Group 13 complex salts.
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Affiliation(s)
- Marcel Schorpp
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF)
- Universität Freiburg
- 79104 Freiburg
- Germany
| | - Stephan Rein
- Institut für Physikalische Chemie
- Universität Freiburg
- 79104 Freiburg
- Germany
| | - Stefan Weber
- Institut für Physikalische Chemie
- Universität Freiburg
- 79104 Freiburg
- Germany
| | - Harald Scherer
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF)
- Universität Freiburg
- 79104 Freiburg
- Germany
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF)
- Universität Freiburg
- 79104 Freiburg
- Germany
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111
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Hickox HP, Wang Y, Luedecke KM, Xie Y, Wei P, Carrillo D, Dominique NL, Cui D, Schaefer HF, Robinson GH. 1,3,2-Diazaborole-derived carbene complexes of boron. Dalton Trans 2017; 47:41-44. [PMID: 29168513 DOI: 10.1039/c7dt04079b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Reaction of 2-bromo-1,3,2-diazaborole (1) with excess BBr3 induces 1,2-hydrogen migration, giving 1,3,2-diazaborole-derived carbene complexes of boron bromide (2). Compound 2 exists in a dynamic solution equilibrium with 1. The 1H NMR study shows that the equilibrium lies to the right side of the dissociation reaction of 2. Parallel reaction of 1 with excess BI3 gives the corresponding 1,3,2-diazaborole-derived carbene boron iodide complex (3). Notably, in contrast to 2, the dissociation reaction of 3 largely lies to the left side, favouring the formation of 3. The dynamic solution equilibrium behaviours of 2 and 3 are probed by both experimental and theoretical methods.
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Affiliation(s)
- Hunter P Hickox
- Department of Chemistry and the Center for Computational Chemistry, The University of Georgia, Athens, Georgia 30602-2556, USA.
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112
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Pécharman AF, Hill MS, McMullin CL, Mahon MF. Magnesium Boryl Reactivity with 9-BBN and Ph3
B: Rational B−B′ Bond Formation and Diborane Isomerization. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709902] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Michael S. Hill
- Department of Chemistry; University of Bath; Bath BA2 7AY UK
| | | | - Mary F. Mahon
- Department of Chemistry; University of Bath; Bath BA2 7AY UK
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113
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Pécharman AF, Hill MS, McMullin CL, Mahon MF. Magnesium Boryl Reactivity with 9-BBN and Ph 3 B: Rational B-B' Bond Formation and Diborane Isomerization. Angew Chem Int Ed Engl 2017; 56:16363-16366. [PMID: 29115736 PMCID: PMC5767756 DOI: 10.1002/anie.201709902] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Indexed: 12/19/2022]
Abstract
Reactions of a magnesium‐based pinacolatoboryl nucleophile with the electrophilic organoboranes, 9‐BBN and Ph3B, provide facile B−B′ single bond formation. Although the Ph3B derivative is thermally stable, when heated, the unsymmetrical diborane(5) anion derived from 9‐BBN is found to isomerize to two regioisomeric species via a proposed mechanism involving dehydroboration of the borabicyclo[3.3.1]nonane and syn‐diboration of the resultant alkenyl carbocycle.
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Affiliation(s)
| | - Michael S Hill
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK
| | | | - Mary F Mahon
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK
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114
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Wang B, Luo G, Nishiura M, Luo Y, Hou Z. Cooperative Trimerization of Carbon Monoxide by Lithium and Samarium Boryls. J Am Chem Soc 2017; 139:16967-16973. [DOI: 10.1021/jacs.7b10108] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Baoli Wang
- Organometallic
Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Gen Luo
- Organometallic
Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Masayoshi Nishiura
- Organometallic
Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yi Luo
- State
Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
| | - Zhaomin Hou
- Organometallic
Chemistry Laboratory and RIKEN Center for Sustainable Resource Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- State
Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
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115
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Protchenko AV, Urbano J, Abdalla JAB, Campos J, Vidovic D, Schwarz AD, Blake MP, Mountford P, Jones C, Aldridge S. Electronic Delocalization in Two and Three Dimensions: Differential Aggregation in Indium “Metalloid” Clusters. Angew Chem Int Ed Engl 2017; 56:15098-15102. [DOI: 10.1002/anie.201708496] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 09/21/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Andrey V. Protchenko
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Juan Urbano
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
- Departamento de Química; Universidad de Huelva; Campus de El Carmen 21007 Huelva Spain
| | - Joseph A. B. Abdalla
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Jesús Campos
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
- Instituto de Investigaciones Químicas (IIQ); Consejo Superior de Investigaciones Científicas (CSIC); Universidad de Sevilla; Avda. Américo Vespucio, 49 41092 Sevilla Spain
| | - Dragoslav Vidovic
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
- SPMS-CBC; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
| | - Andrew D. Schwarz
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Matthew P. Blake
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Philip Mountford
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Cameron Jones
- School of Chemistry; Monash University; PO Box 23 Melbourne VIC 3800 Australia
| | - Simon Aldridge
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
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116
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Protchenko AV, Urbano J, Abdalla JAB, Campos J, Vidovic D, Schwarz AD, Blake MP, Mountford P, Jones C, Aldridge S. Electronic Delocalization in Two and Three Dimensions: Differential Aggregation in Indium “Metalloid” Clusters. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708496] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Andrey V. Protchenko
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Juan Urbano
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
- Departamento de Química; Universidad de Huelva; Campus de El Carmen 21007 Huelva Spain
| | - Joseph A. B. Abdalla
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Jesús Campos
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
- Instituto de Investigaciones Químicas (IIQ); Consejo Superior de Investigaciones Científicas (CSIC); Universidad de Sevilla; Avda. Américo Vespucio, 49 41092 Sevilla Spain
| | - Dragoslav Vidovic
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
- SPMS-CBC; Nanyang Technological University; 21 Nanyang Link Singapore 637371 Singapore
| | - Andrew D. Schwarz
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Matthew P. Blake
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Philip Mountford
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
| | - Cameron Jones
- School of Chemistry; Monash University; PO Box 23 Melbourne VIC 3800 Australia
| | - Simon Aldridge
- Inorganic Chemistry Laboratory; Department of Chemistry; University of Oxford; South Parks Road Oxford OX1 3QR UK
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117
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Taguchi J, Ikeda T, Takahashi R, Sasaki I, Ogasawara Y, Dairi T, Kato N, Yamamoto Y, Bode JW, Ito H. Synthesis of Acylborons by Ozonolysis of Alkenylboronates: Preparation of an Enantioenriched Amino Acid Acylboronate. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707933] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jumpei Taguchi
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Toshiki Ikeda
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Rina Takahashi
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Ikuo Sasaki
- Department of Chemistry and Biological Science; College of Science and Engineering; Aoyama Gakuin University; 5-10-1, Fuchinobe Chuo-ku, Sagamihara-shi 252-5258 Japan
| | - Yasushi Ogasawara
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Tohru Dairi
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Naoya Kato
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Yasunori Yamamoto
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Jeffrey W. Bode
- Laboratorium für Organische Chemie; Department of Chemistry and Applied Bioscience; ETH Zürich; 8093 Zürich Switzerland
| | - Hajime Ito
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
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118
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Taguchi J, Ikeda T, Takahashi R, Sasaki I, Ogasawara Y, Dairi T, Kato N, Yamamoto Y, Bode JW, Ito H. Synthesis of Acylborons by Ozonolysis of Alkenylboronates: Preparation of an Enantioenriched Amino Acid Acylboronate. Angew Chem Int Ed Engl 2017; 56:13847-13851. [DOI: 10.1002/anie.201707933] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Indexed: 12/15/2022]
Affiliation(s)
- Jumpei Taguchi
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Toshiki Ikeda
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Rina Takahashi
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Ikuo Sasaki
- Department of Chemistry and Biological Science; College of Science and Engineering; Aoyama Gakuin University; 5-10-1, Fuchinobe Chuo-ku, Sagamihara-shi 252-5258 Japan
| | - Yasushi Ogasawara
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Tohru Dairi
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Naoya Kato
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Yasunori Yamamoto
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
| | - Jeffrey W. Bode
- Laboratorium für Organische Chemie; Department of Chemistry and Applied Bioscience; ETH Zürich; 8093 Zürich Switzerland
| | - Hajime Ito
- Division of Applied Chemistry and Frontier Chemistry Center; Faculty of Engineering; Hokkaido University; Kita 13 Nishi 8 Kita-ku Sapporo Hokkaido 060-8628 Japan
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119
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Schödel F, Breunig JM, Thiel V, Bolte M, Wagner M, Lerner HW. Synthesis and properties of 1,3-Bis(2,6-diisopropylphenyl)-2-(trimethylstannyl)- 2,3-dihydro-1H-1,3,2-diazaborole. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2017. [DOI: 10.1515/znb-2017-0122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The diazaborole Me3Sn–B{N(Dipp)CH}2 (1; B{N(Dipp)CH}2=N,N′-bis(2,6-diisopropylphenyl)-2,3-dihydro-1H-1,3,2-diazaborolyl) was prepared by the reaction of Me3SnCl with one equivalent of Li[B{N(Dipp)CH}2]. Single crystals of 1 were obtained from hexane (triclinic space group P1̅). The diazaborole 1 was mono-deprotonated at the heterocycle upon treatment with Li[Me] to give product 2. In contrast to Li[B{N(Dipp)CH}2] which reacted with P4 to give the tetraphosphenediide Li2[{HC(Dipp)N}2B–P(1)P(2)P(3)P(4)–B{N(Dipp)CH}2] (3; δ
P=364.5, –29.4; 1
J
P(2),P(3)=–509.8 Hz, 1
J
P(1),P(2)=–434.3 Hz, 2
J
P(1),P(3)=–3.7 Hz, 3
J
P(1),P(4)=178.9 Hz) and the triphosphenide Li[{HC(Dipp)N}2B–PPP–B{N(Dipp)CH}2] (δ
P=665.1, 175.4; 1
J
P,P=500 Hz), the stannyl derivative 1 did not activate white phosphorus. The reaction of 1 with GaCl3 yielded either Me2ClSn–B{N(Dipp)CH}2 (4) or MeCl2Sn–B{N(Dipp)CH}2 (5) depending on the molar ratio of the reactants. The monochlorinated diazaborole Me2ClSn–B{N(Dipp)CH}2 was also obtained by the reaction of 1 with AsCl3.
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Affiliation(s)
- Frauke Schödel
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt am Main , 60438 Frankfurt am Main , Germany
| | - Jens M. Breunig
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt am Main , 60438 Frankfurt am Main , Germany
| | - Vasco Thiel
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt am Main , 60438 Frankfurt am Main , Germany
| | - Michael Bolte
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt am Main , 60438 Frankfurt am Main , Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt am Main , 60438 Frankfurt am Main , Germany
| | - Hans-Wolfram Lerner
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt am Main , Max-von-Laue-Straße 7 , 60438 Frankfurt am Main , Germany , Fax: +49-69-79829260
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120
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Bonath M, Hollfelder CO, Schädle D, Maichle‐Mössmer C, Sirsch P, Anwander R. C–H Bond Activation and Isoprene Polymerization by Lutetium Alkylaluminate/gallate Complexes Bearing a Peripheral Boryl and a Bulky Hydrotris(pyrazolyl)borate Ligand. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700730] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Martin Bonath
- Institut für Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Christoph O. Hollfelder
- Institut für Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Dorothea Schädle
- Institut für Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Cäcilia Maichle‐Mössmer
- Institut für Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Peter Sirsch
- Institut für Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Reiner Anwander
- Institut für Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Germany
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121
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Böser R, Haufe LC, Freytag M, Jones PG, Hörner G, Frank R. Completing the series of boron-nucleophilic cyanoborates: boryl anions of type NHC-B(CN) 2. Chem Sci 2017; 8:6274-6280. [PMID: 28989661 PMCID: PMC5628389 DOI: 10.1039/c7sc02238g] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Accepted: 07/02/2017] [Indexed: 12/02/2022] Open
Abstract
Since the first seminal report of boron-centred nucleophiles, the area of boryl anions has developed only sporadically and requires further systematisation. The boryl anions of type NHC-B(CN)2- (NHC = N-heterocyclic carbene) described herein complete a consistent series with the known anions cAAC-B(CN)2- [cAAC = cyclic(alkyl)(amino)carbene] and B(CN)32-. A novel approach towards NHC-stabilised cyanoboranes based on alkylthio-cyano exchange at boron is presented, and in contrast to other methods affords the products in better purity and yield. Reduction of suitable NHC-dicyanoboranes gave two unprecedented examples of NHC-B(CN)2- boryl anions. The latter were shown to react as boron-centred nucleophiles with facile formation of B-E bonds, where E = C, Si, Sn, P, Au. Bonding analysis by DFT calculations suggests a systematic variation of the energy of the boron-centred HOMO depending on the carbene, which in turn can control the nucleophilic character.
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Affiliation(s)
- Richard Böser
- Technical University of Braunschweig , Department of Life Sciences , Institute of Analytical and Inorganic Chemistry , Hagenring 30 , 38106 , Braunschweig , Germany .
| | - Lisa C Haufe
- Technical University of Braunschweig , Department of Life Sciences , Institute of Analytical and Inorganic Chemistry , Hagenring 30 , 38106 , Braunschweig , Germany .
| | - Matthias Freytag
- Technical University of Braunschweig , Department of Life Sciences , Institute of Analytical and Inorganic Chemistry , Hagenring 30 , 38106 , Braunschweig , Germany .
| | - Peter G Jones
- Technical University of Braunschweig , Department of Life Sciences , Institute of Analytical and Inorganic Chemistry , Hagenring 30 , 38106 , Braunschweig , Germany .
| | - Gerald Hörner
- Technical University of Berlin , Department of Chemistry , Institute of Bioinorganic Chemistry , Strasse des 17. Juni 135 , 10623 Berlin , Germany .
| | - René Frank
- Technical University of Braunschweig , Department of Life Sciences , Institute of Analytical and Inorganic Chemistry , Hagenring 30 , 38106 , Braunschweig , Germany .
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122
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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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123
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Campos J, Nova A, Kolychev EL, Aldridge S. A Combined Experimental/Computational Study of the Mechanism of a Palladium-Catalyzed Bora-Negishi Reaction. Chemistry 2017; 23:12655-12667. [DOI: 10.1002/chem.201702703] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Indexed: 12/11/2022]
Affiliation(s)
- Jesús Campos
- Inorganic Chemistry Laboratory; South Parks Road Oxford OX1 3QR UK
- Instituto de Investigaciones Químicas (IIQ); Departamento de Química Inorgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA); Universidad de Sevilla and Consejo Superior de Investigaciones Científicas (CSIC).; Avenida Américo Vespucio 49 41092 Sevilla Spain
| | - Ainara Nova
- Centre for Theoretical and Computational Chemistry (CTCC); Department of Chemistry; University of Oslo, P. O. Box 1033 Blindern; 0315 Oslo Norway
| | | | - Simon Aldridge
- Inorganic Chemistry Laboratory; South Parks Road Oxford OX1 3QR UK
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124
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Yamamoto E, Shishido R, Seki T, Ito H. Tris(trimethylsilyl)silylboronate Esters: Novel Bulky, Air- and Moisture-Stable Silylboronate Ester Reagents for Boryl Substitution and Silaboration Reactions. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00476] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eiji Yamamoto
- Division of Applied Chemistry & Frontier Chemistry Center, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Ryosuke Shishido
- Division of Applied Chemistry & Frontier Chemistry Center, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Tomohiro Seki
- Division of Applied Chemistry & Frontier Chemistry Center, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| | - Hajime Ito
- Division of Applied Chemistry & Frontier Chemistry Center, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
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125
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Kaaz M, Bäucker C, Deimling M, König S, Schlindwein SH, Bender J, Nieger M, Gudat D. Conventional and Microwave Synthesis of 2-Fluoro-diazaborolidines and Their Reaction with Lithium Phosphanides. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700559] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Manuel Kaaz
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Christian Bäucker
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Max Deimling
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Simon König
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Simon H. Schlindwein
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Johannes Bender
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
| | - Martin Nieger
- Department of Chemistry; University of Helsinki; P. O. Box 55 00014 Helsinki Finland
| | - Dietrich Gudat
- Institut für Anorganische Chemie; University of Stuttgart; Pfaffenwaldring 55 70550 Stuttgart Germany
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126
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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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127
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Braunschweig H, Brückner T, Deißenberger A, Dewhurst RD, Gackstatter A, Gärtner A, Hofmann A, Kupfer T, Prieschl D, Thiess T, Wang SR. Reaction of Dihalodiboranes(4) with a N‐Heterocyclic Silylene: Facile Construction of 1‐Aryl‐2‐Silyl‐1,2‐Diboraindanes. Chemistry 2017; 23:9491-9494. [DOI: 10.1002/chem.201702377] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2017] [Indexed: 12/23/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Tobias Brückner
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Andrea Deißenberger
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Rian D. Dewhurst
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Annika Gackstatter
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Annalena Gärtner
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Alexander Hofmann
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Thomas Kupfer
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Dominic Prieschl
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Torsten Thiess
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Sunewang Rixin Wang
- Institut für Anorganische ChemieJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry and Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
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128
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Pécharman AF, Colebatch AL, Hill MS, McMullin CL, Mahon MF, Weetman C. Easy access to nucleophilic boron through diborane to magnesium boryl metathesis. Nat Commun 2017; 8:15022. [PMID: 28387308 PMCID: PMC5385571 DOI: 10.1038/ncomms15022] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 02/22/2017] [Indexed: 11/14/2022] Open
Abstract
Organoboranes are some of the most synthetically valuable and widely used intermediates in organic and pharmaceutical chemistry. Their synthesis, however, is limited by the behaviour of common boron starting materials as archetypal Lewis acids such that common routes to organoboranes rely on the reactivity of boron as an electrophile. While the realization of convenient sources of nucleophilic boryl anions would open up a wealth of opportunity for the development of new routes to organoboranes, the synthesis of current candidates is generally limited by a need for highly reducing reaction conditions. Here, we report a simple synthesis of a magnesium boryl through the heterolytic activation of the B–B bond of bis(pinacolato)diboron, which is achieved by treatment of an easily generated magnesium diboranate complex with 4-dimethylaminopyridine. The magnesium boryl is shown to act as an unambiguous nucleophile through its reactions with iodomethane, benzophenone and N,N′-di-isopropyl carbodiimide and by density functional theory. Organoboranes are widely employed in organic synthesis and typically are prepared using electrophilic boron sources. Here the authors report a route to nucleophilic boryl anions via organomagnesium-driven cleavage of boron-boron bonds.
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Affiliation(s)
| | - Annie L Colebatch
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Michael S Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Claire L McMullin
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Mary F Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Catherine Weetman
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
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129
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García-López D, Cid J, Marqués R, Fernández E, Carbó JJ. Quantitative Structure-Activity Relationships for the Nucleophilicity of Trivalent Boron Compounds. Chemistry 2017; 23:5066-5075. [DOI: 10.1002/chem.201605798] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Diego García-López
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Marcel⋅lí Domingo 1 43007 Tarragona Spain
| | - Jessica Cid
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Marcel⋅lí Domingo 1 43007 Tarragona Spain
| | - Ruben Marqués
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Marcel⋅lí Domingo 1 43007 Tarragona Spain
| | - Elena Fernández
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Marcel⋅lí Domingo 1 43007 Tarragona Spain
| | - Jorge J. Carbó
- Departament de Química Física i Inorgànica; Universitat Rovira i Virgili; Marcel⋅lí Domingo 1 43007 Tarragona Spain
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130
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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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131
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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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132
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Arrowsmith M, Braunschweig H, Radacki K, Thiess T, Turkin A. Facile Access to Unprecedented Electron-Precise Monohydrodiboranes(4), cis-1,2-Dihydrodiboranes(4), and a 1,1-Dihydrodiborane(5). Chemistry 2017; 23:2179-2184. [PMID: 27935652 DOI: 10.1002/chem.201605270] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Indexed: 11/07/2022]
Abstract
2,3-Bis(dimethylamino)-substituted B2 N2 C2 heterocycles underwent selective dimethylamino/hydride exchange with either one or two equivalents of BH3 ⋅SMe2 to give the corresponding cyclic monohydrido- or (cis)1,2-dihydridodiboranes(4), respectively. Upon either heating or irradiation in solution, the latter underwent ring contraction to the corresponding five-membered BN2 C2 heterocycles, whereas irradiation of the 1,2-dimethylaminoethene-supported 1,2-dihydridodiborane(4) in the presence of PEt3 gave an unprecedented unsymmetrical 1,1-dihydrodiborane(5) phosphine adduct.
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Affiliation(s)
- Merle Arrowsmith
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Holger Braunschweig
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Krzysztof Radacki
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Torsten Thiess
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Arthur Turkin
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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133
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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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134
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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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135
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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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136
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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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137
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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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138
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Jiang YY, Wang C, Liang Y, Man X, Bi S, Fu Y. A Ligand-Dissociation-Involved Mechanism in Amide Formation of Monofluoroacylboronates with Hydroxylamines. J Org Chem 2017; 82:1064-1072. [DOI: 10.1021/acs.joc.6b02642] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Yuan-Ye Jiang
- School
of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Chen Wang
- Zhejiang
Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, People’s Republic of China
| | - Yujie Liang
- School
of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Xiaoping Man
- School
of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Siwei Bi
- School
of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, People’s Republic of China
| | - Yao Fu
- Collaborative
Innovation Center of Chemistry for Energy Materials, CAS Key Laboratory
of Urban Pollutant Conversion, Department of Chemistry, University of Science and Technology of China, Hefei 230026, People’s Republic of China
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139
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Wu D, Li Y, Ganguly R, Kinjo R. A snapshot of inorganic Janovsky complex analogues featuring a nucleophilic boron center. Chem Commun (Camb) 2017; 53:12734-12737. [DOI: 10.1039/c7cc07616a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The addition of phenyl lithium (PhLi) to an aromatic 1,3,2,5-diazadiborinine (1) afforded isolable ionic species 2, which can be deemed as an inorganic analogue of a Janovsky complex.
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Affiliation(s)
- Di Wu
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Yongxin Li
- NTU-CBC Crystallography Facility
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Rakesh Ganguly
- NTU-CBC Crystallography Facility
- Nanyang Technological University
- Singapore 637371
- Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- Singapore 637371
- Singapore
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140
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Scharnagl FK, Bose SK, Marder TB. Acylboranes: synthetic strategies and applications. Org Biomol Chem 2017; 15:1738-1752. [DOI: 10.1039/c6ob02425d] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Acylboranes are an attractive class of compounds, of which the synthesis has very recently been documented as summarised in this review. Access to these compounds provides a path to study their properties and reactivity.
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Affiliation(s)
- Florian Korbinian Scharnagl
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
| | - Shubhankar Kumar Bose
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
- Centre for Nano and Material Sciences (CNMS)
| | - Todd B. Marder
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with Boron
- Julius-Maximilians-Universität Würzburg
- 97074 Würzburg
- Germany
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141
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Ito S, Kato N, Mikami K. Stable (sila)difluoromethylboranes via C–F activation of fluoroform derivatives. Chem Commun (Camb) 2017; 53:5546-5548. [DOI: 10.1039/c7cc02327h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Lithium 1,3-bis(2,6-diisopropylphenyl)-2,3-dihydro-1H-1,3,2-diazaborol-2-uide activates the C–F linkage of CF3R (R = H, SiMe3) to provide difluoromethyl-substituted boranes as air-stable compounds.
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Affiliation(s)
- Shigekazu Ito
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Meguro
- Japan
| | - Naoto Kato
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Meguro
- Japan
| | - Koichi Mikami
- Department of Chemical Science and Engineering
- School of Materials and Chemical Technology
- Tokyo Institute of Technology
- Meguro
- Japan
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142
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McLellan R, Kennedy AR, Orr SA, Robertson SD, Mulvey RE. Lithium Dihydropyridine Dehydrogenation Catalysis: A Group 1 Approach to the Cyclization of Diamine Boranes. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610905] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ross McLellan
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Alan R. Kennedy
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Samantha A. Orr
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Stuart D. Robertson
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
| | - Robert E. Mulvey
- WestCHEM, Department of Pure and Applied Chemistry; University of Strathclyde; Glasgow G1 1XL UK
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143
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Wang G, Liu L, Wang H, Ding YS, Zhou J, Mao S, Li P. N,B-Bidentate Boryl Ligand-Supported Iridium Catalyst for Efficient Functional-Group-Directed C–H Borylation. J Am Chem Soc 2016; 139:91-94. [DOI: 10.1021/jacs.6b11867] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Guanghui Wang
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Li Liu
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Hong Wang
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - You-Song Ding
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Jing Zhou
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Shuai Mao
- Department
of Medicinal Chemistry, School of Pharmacy, Xi’an Jiaotong University, Xi’an, 710061, China
| | - Pengfei Li
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
- State
Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
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144
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McLellan R, Kennedy AR, Orr SA, Robertson SD, Mulvey RE. Lithium Dihydropyridine Dehydrogenation Catalysis: A Group 1 Approach to the Cyclization of Diamine Boranes. Angew Chem Int Ed Engl 2016; 56:1036-1041. [PMID: 28000994 PMCID: PMC5396369 DOI: 10.1002/anie.201610905] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Indexed: 11/15/2022]
Abstract
In reactions restricted previously to a ruthenium catalyst, a 1‐lithium‐2‐alkyl‐1,2‐dihydropyridine complex is shown to be a competitive alternative dehydrogenation catalyst for the transformation of diamine boranes into cyclic 1,3,2‐diazaborolidines, which can in turn be smoothly arylated in good yields. This study established the conditions and solvent dependence of the catalysis through NMR monitoring, with mechanistic insight provided by NMR (including DOSY) experiments and X‐ray crystallographic studies of several model lithio intermediates.
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Affiliation(s)
- Ross McLellan
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Alan R Kennedy
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Samantha A Orr
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Stuart D Robertson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Robert E Mulvey
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
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145
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Arrowsmith M, Braunschweig H, Stennett TE. Formation and Reactivity of Electron-Precise B−B Single and Multiple Bonds. Angew Chem Int Ed Engl 2016; 56:96-115. [DOI: 10.1002/anie.201610072] [Citation(s) in RCA: 185] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Indexed: 01/25/2023]
Affiliation(s)
- Merle Arrowsmith
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
| | - Holger Braunschweig
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
| | - Tom E. Stennett
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
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146
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Synthese und Reaktivität von Verbindungen mit elektronenpräzisen B‐B‐Einfach‐ und B‐B‐Mehrfachbindungen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610072] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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147
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Hirano K. Development of Heteroatom-introducing Methodologies Based on Ate Complex Formation: Perfluoroalkylation, Borylation, Aromatic Hydroxylation, and Amination Reactions. YAKUGAKU ZASSHI 2016; 136:1455-1468. [DOI: 10.1248/yakushi.16-00171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Keiichi Hirano
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
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148
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Fischer C, Klein W, Jantke LA, Schiegerl LJ, Fässler TF. Reaction of SiCl2·dipp with K[Ge9{Si(SiMe3)3}3] - Synthesis and Characterization of [K(dipp)2][Ge9{Si(SiMe3)3}3]·tol and [dipp-H][Ge9{Si(SiMe3)3}3]·2acn [dipp = 1,3-Bis(2,6-Diisopropylphenyl)imidazol-2-ylidene]. Z Anorg Allg Chem 2016. [DOI: 10.1002/zaac.201600296] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Christina Fischer
- Lehrstuhl für Anorganische Chemie mit Schwerpunkt Neue Materialien; Fakultät für Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching Germany
| | - Wilhelm Klein
- Lehrstuhl für Anorganische Chemie mit Schwerpunkt Neue Materialien; Fakultät für Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching Germany
| | - Laura-Alice Jantke
- Lehrstuhl für Anorganische Chemie mit Schwerpunkt Neue Materialien; Fakultät für Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching Germany
| | - Lorenz J. Schiegerl
- Lehrstuhl für Anorganische Chemie mit Schwerpunkt Neue Materialien; Fakultät für Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching Germany
| | - Thomas F. Fässler
- Lehrstuhl für Anorganische Chemie mit Schwerpunkt Neue Materialien; Fakultät für Chemie; Technische Universität München; Lichtenbergstraße 4 85747 Garching Germany
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149
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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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150
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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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