1
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Shere HTW, Liu HY, Neale SE, Hill MS, Mahon MF, McMullin CL. The borylamino-diborata-allyl anion. Chem Sci 2024; 15:7999-8007. [PMID: 38817583 PMCID: PMC11134337 DOI: 10.1039/d4sc01953a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2024] [Accepted: 04/28/2024] [Indexed: 06/01/2024] Open
Abstract
Reactions of β-diketiminato alkaline earth alkyldiboranate derivatives [(BDI)Ae{pinBB(R)pin}] (BDI = HC{(Me)CNDipp}2; Dipp = 2,6-i-Pr2C6H3; Ae = Mg, R = n-Bu or Ae = Ca, R = n-hexyl) with t-BuNC provide access to the respective group 2 derivatives of unprecedented diborata-allyl, {(pinB)2CNBpin(t-Bu)}-, anions. Although the necessary mode of B-C bond cleavage implicated in these transformations could not be elucidated, further studies of the reactivity of magnesium triboranates toward isonitriles delivered a more general and rational synthetic access to analogous anionic moieties. Extending this latter reactivity to a less symmetric triboranate variant also provided an isomeric Mg-C-bonded dibora-alkyl species and sufficient experimental insight to prompt theoretical evaluation of this reactivity. DFT calculations, thus, support a reaction pathway predicated on initial RNC attack at a peripheral boron centre and the intermediacy of such dibora-alkyl intermediates.
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Affiliation(s)
- Henry T W Shere
- Department of Chemistry, University of Bath Claverton Down Bath BA2 7AY UK
| | - Han-Ying Liu
- Department of Chemistry, University of Bath Claverton Down Bath BA2 7AY UK
| | - Samuel E Neale
- 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
| | - Mary F Mahon
- 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
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2
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Wang H. Synthesis, structure and reactivity of iminoborane radicals. Chem Commun (Camb) 2024; 60:3806-3809. [PMID: 38487988 DOI: 10.1039/d4cc00720d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
The synthesis, characterization and reactivities of iminoborane radicals were reported. Both X-ray analysis and density functional theory calculations revealed that the unpaired electron delocalizes over the N(1)-C(1)-B(1)-N(2) moiety. Radical trap reactions showed that this radical species acts as a boron radical. These reactions also serve as methods for the synthesis of Lewis base-stabilized oxyl-terminated iminoboranes.
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Affiliation(s)
- Hanqiang Wang
- Department of Chemistry and Dongguan Key Laboratory for Data Science and Intelligent Medicine, Great Bay University, Dongguan 523000, China.
- Department of Materials Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen, Guangdong 518055, China
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3
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Fernández E. α-Boryl Carbanions: The Influence of Geminal Heteroatoms in C-C Bond Formation. CHEM REC 2024; 24:e202300349. [PMID: 38308376 DOI: 10.1002/tcr.202300349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 01/12/2024] [Indexed: 02/04/2024]
Abstract
The wide applications of alpha-boryl carbanions in selective coupling with organohalides, imines/carbonyls and conjugated unsaturated substrates has become an interesting tool for organic synthesis. Strategically, the inclusion of heteroatoms, such as Si, S, N, F, Cl, Br and I in the alpha position opens a new venue towards multifunctionalities in molecular design. Here, a conceptual and practical view on powerful carbanions, containing α-silicoboron, α-thioboron, α-haloboron and α-aminoboron is given, as well as a prespective on their efficient application for selective electrophilic trapping.
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Affiliation(s)
- Elena Fernández
- Dept. Química Física i Inorgànica, University Rovira i Virgili, Tarragona, Spain
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4
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Eaton M, Zhang Y, Liu SY. Borataalkenes, boraalkenes, and the η 2-B,C coordination mode in coordination chemistry and catalysis. Chem Soc Rev 2024; 53:1915-1935. [PMID: 38190152 PMCID: PMC10922737 DOI: 10.1039/d3cs00730h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2024]
Abstract
Borataalkenes and boraalkenes are the boron-containing isoelectronic analogues of alkenes and vinyl cations respectively. Compared with alkenes, the borataalkene and boraalkene ligand motifs in transition metal coordination chemistry are relatively underexplored. In this review, the synthesis of borataalkene and boraalkene complexes and other transition metal complexes featuring the η2-B,C coordination mode is described. The diversity of coordination modes and geometry in these complexes, and the spectroscopic and structural evidence supporting their assignments is disclosed as well as computational analysis of bonding. The applications of the borataalkene ligand motif in synthetic organic homogeneous catalysis, especially those involving geminal bis(pinacolatoboronates) and 1,4-azaborines, are discussed.
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Affiliation(s)
- Maxwell Eaton
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860, USA.
| | - Yuanzhe Zhang
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860, USA.
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860, USA.
- Université de Pau et des Pays de l'Adour, E2S UPPA/CNRS, Institut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux IPREM UMR 5254. Hélioparc, 2 avenue P. Angot, 64053 Pau cedex 09, France
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5
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Tortajada A, Bole LJ, Mu M, Stanford M, Peñas-Defrutos MN, García-Melchor M, Hevia E. Sodium mediated deprotonative borylation of arenes using sterically demanding B(CH 2SiMe 3) 3: unlocking polybasic behaviour and competing lateral borane sodiation. Chem Sci 2023; 14:6538-6545. [PMID: 37350840 PMCID: PMC10283504 DOI: 10.1039/d3sc01705b] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 05/04/2023] [Indexed: 06/24/2023] Open
Abstract
The deprotonative metalation of organic molecules has become a convenient route to prepare functionalised aromatic substrates. Amongst the different metallating reagents available, sodium bases have recently emerged as a more sustainable and powerful alternative to their lithium analogues. Here we report the study of the sterically demanding electrophilic trap B(CH2SiMe3)3 for the deprotonative borylation of arenes using NaTMP (TMP = 2,2,6,6-tetramethylpiperidide) in combination with tridentate Lewis donor PMDETA (PMDETA = N,N,N',N'',N''-pentamethyldiethylenetriamine). Using anisole and benzene as model substrates, unexpected polybasic behaviour has been uncovered, which enables the formal borylation of two equivalents of the relevant arene. The combination of X-ray crystallographic and NMR monitoring studies with DFT calculations has revealed that while the first B-C bond forming process takes place via a sodiation/borylation sequence to furnish [(PMDETA)NaB(Ar)(CH2SiMe3)3] species, the second borylation step is facilitated by the formation of a borata-alkene intermediate, without the need of an external base. For non-activated benzene, it has also been found that under stoichimetric conditions the lateral sodiation of B(CH2SiMe3)3 becomes a competitive reaction pathway furnishing a novel borata-alkene complex. Showing a clear alkali-metal effect, the use of the sodium base is key to access this reactivity, while the metalation/borylation of the amine donor PMDETA is observed instead when LiTMP is used.
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Affiliation(s)
- Andreu Tortajada
- Department für Chemie und Biochemie, Universität Bern Freiestrasse 3 3012 Bern Switzerland
| | - Leonie J Bole
- Department für Chemie und Biochemie, Universität Bern Freiestrasse 3 3012 Bern Switzerland
| | - Manting Mu
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin College Green Dublin 2 Ireland
| | - Martin Stanford
- Department für Chemie und Biochemie, Universität Bern Freiestrasse 3 3012 Bern Switzerland
| | - Marconi N Peñas-Defrutos
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin College Green Dublin 2 Ireland
- IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid 47071-Valladolid Spain
| | - Max García-Melchor
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin College Green Dublin 2 Ireland
| | - Eva Hevia
- Department für Chemie und Biochemie, Universität Bern Freiestrasse 3 3012 Bern Switzerland
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6
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Full F, Wölflick Q, Radacki K, Braunschweig H, Nowak‐Król A. Enhanced Optical Properties of Azaborole Helicenes by Lateral and Helical Extension. Chemistry 2022; 28:e202202280. [PMID: 35877557 PMCID: PMC9826013 DOI: 10.1002/chem.202202280] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Indexed: 01/11/2023]
Abstract
The synthesis and characterization of laterally extended azabora[5]-, -[6]- and -[7]helicenes, assembled from N-heteroaromatic and dibenzo[g,p]chrysene building blocks is described. Formally, the π-conjugated systems of the pristine azaborole helicenes were enlarged with a phenanthrene unit leading to compounds with large Stokes shifts, significantly enhanced luminescence quantum yields (Φ) and dissymmetry factors (glum ). The beneficial effect on optical properties was also observed for helical elongation. The combined contributions of lateral and helical extensions resulted in a compound showing green emission with Φ of 0.31 and |glum | of 2.2×10-3 , highest within the series of π-extended azaborahelicenes and superior to emission intensity and chiroptical response of its non-extended congener. This study shows that helical and lateral extensions of π-conjugated systems are viable strategies to improve features of azaborole helicenes. In addition, single crystal X-ray analysis of configurationally stable [6]- and -[7]helicenes was used to provide insight into their packing arrangements.
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Affiliation(s)
- Felix Full
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with BoronUniversität WürzburgAm Hubland97074WürzburgGermany,Institut für Organische Chemie and Center for Nanosystems ChemistryUniversität WürzburgAm Hubland97074WürzburgGermany
| | - Quentin Wölflick
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with BoronUniversität WürzburgAm Hubland97074WürzburgGermany,Institut für Organische Chemie and Center for Nanosystems ChemistryUniversität WürzburgAm Hubland97074WürzburgGermany
| | - Krzysztof Radacki
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with BoronUniversität WürzburgAm Hubland97074WürzburgGermany
| | - Holger Braunschweig
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with BoronUniversität WürzburgAm Hubland97074WürzburgGermany
| | - Agnieszka Nowak‐Król
- Institut für Anorganische Chemie and Institute for Sustainable Chemistry & Catalysis with BoronUniversität WürzburgAm Hubland97074WürzburgGermany,Institut für Organische Chemie and Center for Nanosystems ChemistryUniversität WürzburgAm Hubland97074WürzburgGermany
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7
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Booth AC, Vasko P, Fuentes MÁ, Cornelissen B, Faulkner S, Aldridge S. Boronic ester functionalised 1,8-diboryl-naphthalene scaffolds: fluoride versus oxide chelation. Dalton Trans 2022; 51:15783-15791. [PMID: 36189491 DOI: 10.1039/d2dt02888c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
1,8-Bis(boronic ester) derivatives of naphthalene, 1,8-C10H6{B(OR)2}2, present an attractive target as receptors for the fluoride ion via B-F-B chelation, but are synthetically challenging to access due to the competing formation of a very stable anhydride containing a B-O-B motif. By contrast, unsymmetrical systems of the type 1,8-C10H6{B(OR)2}(BR'2) can be synthesized for (OR)2 = 1,2-O2C6H4 (i.e. Cat) and R' = Mes. This system is shown to be competent for the uptake of F-, making use of a chelating mode of action and the formation of a bridging B-F-B motif between the two boron centres. However, both experimental and quantum chemical studies indicate that the μ2-F adduct is the kinetic product of fluoride uptake, with an alternative structural motif featuring a terminal B-F bond and a B-O-B bridge using one of the catechol oxygens being (marginally) more favourable thermodynamically.
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Affiliation(s)
- Anna C Booth
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
| | - Petra Vasko
- Department of Chemistry, University of Helsinki, PO Box 55, 00014, Helsinki, Finland
| | - M Ángeles Fuentes
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK.
| | - Bart Cornelissen
- Medical Research Council Oxford Institute for Radiation Oncology, Department of Oncology, University of Oxford, Oxford, UK
| | - Stephen Faulkner
- 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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8
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Güven Z, Denker L, Wullschläger D, Pablo Martínez J, Trzaskowski B, Frank R. Reductive Al-B σ-Bond Formation in Alumaboranes: Facile Scission of Polar Multiple Bonds. Angew Chem Int Ed Engl 2022; 61:e202209502. [PMID: 35947518 PMCID: PMC9826004 DOI: 10.1002/anie.202209502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Indexed: 01/11/2023]
Abstract
We present facile access to an alumaborane species with electron precise Al-B σ-bond. The reductive rearrangement of 1-(AlI2 ), 8-(BMes2 ) naphthalene (Mes=2,4,6-Me3 C6 H2 ) affords the alumaborane species cyclo-(1,8-C10 H6 )-[1-Al(Mes)(OEt2 )-8-B(Mes)] with a covalent Al-B σ-bond. The Al-B σ-bond performs the reductive scission of multiple bonds: S=C(NiPrCMe)2 affords the naphthalene bridged motif B-S-Al(NHC), NHC=N-heterocyclic carbene, while O=CPh2 is deoxygenated to afford an B-O-Al bridged species with incorporation of the remaining ≡CPh2 fragment into the naphthalene scaffold. The reaction with isonitrile Xyl-N≡C (Xyl=2,6-Me2 C6 H4 ) proceeds via a proposed (amino boryl) carbene species; which adds a second equivalent of isonitrile to ultimately form the Al-N-B bridged species cyclo-(1,8-C10 H6 )-[1-Al(Mes)-N(Xyl)-8-B{C(Mes)=C-N-Xyl}] with complete scission of the C≡N triple bond. The latter reaction is supported with isolated intermediates and by DFT calculations.
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Affiliation(s)
- Zeynep Güven
- Department of Inorganic and Analytical ChemistryTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Lars Denker
- Department of Inorganic and Analytical ChemistryTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Daniela Wullschläger
- Department of Inorganic and Analytical ChemistryTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | | | | | - René Frank
- Department of Inorganic and Analytical ChemistryTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
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9
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Güven Z, Denker L, Wullschläger D, Martínez JP, Trzaskowski B, Frank R. Reductive Al−B σ‐Bond Formation in Alumaboranes: Facile Scission of Polar Multiple Bonds. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Zeynep Güven
- Technische Universität Braunschweig Fakultät für Lebenswissenschaften: Technische Universitat Braunschweig Fakultat fur Lebenswissenschaften Anorganische und Analytische Chemie GERMANY
| | - Lars Denker
- Technische Universität Braunschweig Fakultät für Lebenswissenschaften: Technische Universitat Braunschweig Fakultat fur Lebenswissenschaften Anorganische und Analytische Chemie GERMANY
| | - Daniela Wullschläger
- Technische Universität Braunschweig Fakultät für Lebenswissenschaften: Technische Universitat Braunschweig Fakultat fur Lebenswissenschaften Anorganische und Analytische Chemie GERMANY
| | - Juan Pablo Martínez
- University of Warsaw: Uniwersytet Warszawski Center of New Technologies POLAND
| | - Bartosz Trzaskowski
- University of Warsaw: Uniwersytet Warszawski Center of New Technologies POLAND
| | - René Frank
- Technische Universität Braunschweig Fakultät für Lebenswissenschaften: Technische Universitat Braunschweig Fakultat fur Lebenswissenschaften Inorganic and Analytical Chemistry Hagenring 30 38106 Braunschweig GERMANY
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10
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Güven Z, Denker L, Dolati H, Wullschläger D, Trzaskowski B, Frank R. Reactions of a Four‐Membered Borete with Carbon, Silicon, and Gallium Donor Ligands: Fused and Spiro‐Type Boracycles. Chemistry 2022; 28:e202200673. [PMID: 35362629 PMCID: PMC9322404 DOI: 10.1002/chem.202200673] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Indexed: 12/27/2022]
Abstract
Donor‐acceptor cyclopropanes or cyclobutanes are dipolar reagents, which are widely used in the synthesis of complex organic (hetero)cycles in ring expansion reactions. Applying this concept to boron containing heterocycles, the four‐membered borete cyclo‐iPr2N‐BC10H6 reacted with the carbon donor ligands 2,6‐xylylisonitrile and the carbene IMes :C(NMesCH)2 with ring expansion and ring fusion, respectively. In particular, the tetracyclic structure formed with IMes displays zwitterionic character and absorption in the visible region. In contrast to the carbene IMes, the heavier carbenoids :Si(NDippCH)2 and :Ga(AmIm) with a two‐coordinate donor atom afford spiro‐type bicyclic compounds, which display four‐coordinate geometry at silicon or gallium. (TD‐)DFT calculations provide deeper insight into the mechanism of formation and the absorption properties of these new compounds.
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Affiliation(s)
- Zeynep Güven
- Department of Inorganic and Analytical Chemistry Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Lars Denker
- Department of Inorganic and Analytical Chemistry Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Hadi Dolati
- Department of Inorganic and Analytical Chemistry Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Daniela Wullschläger
- Department of Inorganic and Analytical Chemistry Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Bartosz Trzaskowski
- Centre of New Technologies University of Warsaw Banacha 2 C 02-097 Warszawa Poland
| | - René Frank
- Department of Inorganic and Analytical Chemistry Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
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11
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Cyraniak A, Freza S, Skurski P. An ab initio study on the stability of isolated borata-alkene synthons. Chem Phys 2022. [DOI: 10.1016/j.chemphys.2022.111543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Xiang L, Wang J, Su W, Lin Z, Ye Q. Facile access to halogenated cationic BC-centered organoborons isoelectronic with alkenyl halides. Dalton Trans 2021; 50:17491-17494. [PMID: 34806110 DOI: 10.1039/d1dt03325e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A facile strategy to prepare halogenated cationic BC-centered organoboron analogues of alkenyl halides via the reaction between carbodiphosphoranes (CDPs) and aryl dihaloboranes is reported. Structural comparison of the halogen and alkoxy derivatives, as well as detailed computational studies, corroborates the polarized double dative bonding nature of the central BC double bonds.
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Affiliation(s)
- Libo Xiang
- Department of Chemistry, Southern University of Science and Technology, 518055 Shenzhen, P. R. China. .,School of Chemistry and Chemical Engineering, Harbin Institute of Technology, 150001 Harbin, P. R. China
| | - Junyi Wang
- Department of Chemistry, Southern University of Science and Technology, 518055 Shenzhen, P. R. China. .,Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Wei Su
- Department of Chemistry, Southern University of Science and Technology, 518055 Shenzhen, P. R. China.
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Qing Ye
- Department of Chemistry, Southern University of Science and Technology, 518055 Shenzhen, P. R. China.
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13
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Dzhemilev UM, Khusainova LI, Ryazanov KS, Khafizova LO. Boron-containing small rings: synthesis, properties, and application prospects. Russ Chem Bull 2021. [DOI: 10.1007/s11172-021-3292-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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14
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Li J, Daniliuc CG, Matern J, Fernández G, Kehr G, Erker G. Multi-component synthesis of dihydro-1,3-azaborinine derived oxindole isosteres. Chem Commun (Camb) 2021; 57:7689-7692. [PMID: 34259251 DOI: 10.1039/d1cc02557k] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report on the synthesis of the first examples of 1,3-azaborinine derived oxindole systems, the BN-isosteres of the important compound class of the oxindoles. Hydroboration of terminal aryl acetylenes with FmesBH2, followed by treatment with 2 equiv. of a glycine ester derived isonitrile gave a small series of 1,3-azaborinine derived oxindoles. The new BN-oxindoles show interesting photophysical behavior.
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Affiliation(s)
- Jun Li
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Jonas Matern
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Gustavo Fernández
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Gerald Kehr
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
| | - Gerhard Erker
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraβe 40, 48149, Münster, Germany.
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15
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Bartholome TA, Martinez JJ, Kaur A, Wilson DJD, Dutton JL, Martin CD. Borataalkene Hydrofunctionalization Reactions. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00261] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tyler A. Bartholome
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Jesse J. Martinez
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Aishvaryadeep Kaur
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - David J. D. Wilson
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Jason L. Dutton
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
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16
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Phillips NA, Kong RY, White AJP, Crimmin MR. Group 11 Borataalkene Complexes: Models for Alkene Activation. Angew Chem Int Ed Engl 2021; 60:12013-12019. [PMID: 33605521 PMCID: PMC8252388 DOI: 10.1002/anie.202100919] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Indexed: 12/31/2022]
Abstract
A series of linear late transition metal (M=Cu, Ag, Au and Zn) complexes featuring a side-on [B=C]- containing ligand have been isolated and characterised. The [B=C]- moiety is isoelectronic with the C=C system of an alkene. Comparison across the series shows that in the solid-state, deviation between the η2 and η1 coordination mode occurs. A related zinc complex containing two [B=C]- ligands was prepared as a further point of comparison for the η1 coordination mode. The bonding in these new complexes has been interrogated by computational techniques (QTAIM, NBO, ETS-NOCV) and rationalised in terms of the Dewar-Chatt-Duncanson model. The combined structural and computational data provide unique insight into catalytically relevant linear d10 complexes of Cu, Ag and Au. Slippage is proposed to play a key role in catalytic reactions of alkenes through disruption and polarisation of the π-system. Through the preparation and analysis of a consistent series of group 11 complexes, we show that variation of the metal can impact the coordination mode and hence substrate activation.
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Affiliation(s)
- Nicholas A. Phillips
- Department of Chemistry, Molecular Sciences Research HubImperial College London82 Wood Lane, Shepherds BushLondonW12 0BZUK
| | - Richard Y. Kong
- Department of Chemistry, Molecular Sciences Research HubImperial College London82 Wood Lane, Shepherds BushLondonW12 0BZUK
| | - Andrew J. P. White
- Department of Chemistry, Molecular Sciences Research HubImperial College London82 Wood Lane, Shepherds BushLondonW12 0BZUK
| | - Mark R. Crimmin
- Department of Chemistry, Molecular Sciences Research HubImperial College London82 Wood Lane, Shepherds BushLondonW12 0BZUK
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17
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Phillips NA, Kong RY, White AJP, Crimmin MR. Group 11 Borataalkene Complexes: Models for Alkene Activation. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100919] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Nicholas A. Phillips
- Department of Chemistry, Molecular Sciences Research Hub Imperial College London 82 Wood Lane, Shepherds Bush London W12 0BZ UK
| | - Richard Y. Kong
- Department of Chemistry, Molecular Sciences Research Hub Imperial College London 82 Wood Lane, Shepherds Bush London W12 0BZ UK
| | - Andrew J. P. White
- Department of Chemistry, Molecular Sciences Research Hub Imperial College London 82 Wood Lane, Shepherds Bush London W12 0BZ UK
| | - Mark R. Crimmin
- Department of Chemistry, Molecular Sciences Research Hub Imperial College London 82 Wood Lane, Shepherds Bush London W12 0BZ UK
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19
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Su X, Bartholome TA, Tidwell JR, Pujol A, Yruegas S, Martinez JJ, Martin CD. 9-Borafluorenes: Synthesis, Properties, and Reactivity. Chem Rev 2021; 121:4147-4192. [DOI: 10.1021/acs.chemrev.0c01068] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Xiaojun Su
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Tyler A. Bartholome
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - John R. Tidwell
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Alba Pujol
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Sam Yruegas
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Jesse J. Martinez
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
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20
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He J, Rauch F, Finze M, Marder TB. (Hetero)arene-fused boroles: a broad spectrum of applications. Chem Sci 2020; 12:128-147. [PMID: 34163585 PMCID: PMC8178973 DOI: 10.1039/d0sc05676f] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
(Hetero)arene-fused boroles are a class of compounds containing a 5-membered boron diene-ring. Based on their molecular framework, the (hetero)arene-fused boroles can be considered as boron-doped polycyclic antiaromatic hydrocarbons and are thus of great interest. Due to the vacant pz orbital on the 3-coordinate boron atom, the antiaromaticity and strain of the 5-membered borole ring, (hetero)arene-fused boroles possess strong electron accepting abilities and Lewis acidity. By functionalization, they can be tuned to optimize different properties for specific applications. Herein, we summarize synthetic methodologies, different strategies for their functionalization, and applications of (hetero)arene-fused boroles. (Hetero)arene-fused boroles, ‘antiaromatic’ 2n-electron π-systems, more stable and more functionalizable than boroles, offer greater potential for a variety of applications.![]()
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Affiliation(s)
- Jiang He
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Florian Rauch
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Maik Finze
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Todd B Marder
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
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21
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Watanabe K, Ueno A, Tao X, Škoch K, Jie X, Vagin S, Rieger B, Daniliuc CG, Letzel MC, Kehr G, Erker G. Reactions of an anionic chelate phosphane/borata-alkene ligand with [Rh(nbd)Cl] 2, [Rh(CO) 2Cl] 2 and [Ir(cod)Cl] 2. Chem Sci 2020; 11:7349-7355. [PMID: 33209245 PMCID: PMC7654189 DOI: 10.1039/d0sc02223c] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Accepted: 06/18/2020] [Indexed: 11/21/2022] Open
Abstract
Borata-alkenes can serve as anionic olefin equivalent ligands in transition metal chemistry. A chelate ligand of this type is described and used for metal coordination. Deprotonation of the Mes2P(CH2)2B(C6F5)2 frustrated Lewis pair in the α-CH[B] position gave the methylene-bridged phosphane/borata-alkene anion. It reacted with the [Rh(nbd)Cl] or [Rh(CO)2Cl] dimers to give the respective neutral chelate [P/C[double bond, length as m-dash]B][Rh] complexes. The reaction of the [P/C[double bond, length as m-dash]B]- anion with [Ir(cod)Cl]2 proceeded similarly, only that the complex underwent a subsequent oxidative addition reaction at the mesityl substituent. Both the resulting Ir(iii)hydride complex 15 and the P/borata-alkene Rh system 12 were used as hydrogenation catalysts. The [P/C[double bond, length as m-dash]B(C6F5)2]Rh(nbd) complex 12 served as a catalyst for arylacetylene polymerization.
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Affiliation(s)
- Kohei Watanabe
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Atsushi Ueno
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Xin Tao
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Karel Škoch
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Xiaoming Jie
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Sergei Vagin
- Wacker-Lehrstuhl für Makromolekulare Chemie , Fakultät für Chemie , Technische Universität München , Lichtenbergstraße 4, 85747 Garching bei München , Germany
| | - Bernhard Rieger
- Wacker-Lehrstuhl für Makromolekulare Chemie , Fakultät für Chemie , Technische Universität München , Lichtenbergstraße 4, 85747 Garching bei München , Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Matthias C Letzel
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Gerald Kehr
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
| | - Gerhard Erker
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany .
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22
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Radtke J, Schickedanz K, Bamberg M, Menduti L, Schollmeyer D, Bolte M, Lerner HW, Wagner M. Selective access to either a doubly boron-doped tetrabenzopentacene or an oxadiborepin from the same precursor. Chem Sci 2019; 10:9017-9027. [PMID: 32874487 PMCID: PMC7442282 DOI: 10.1039/c9sc03115d] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Accepted: 07/31/2019] [Indexed: 01/05/2023] Open
Abstract
Depending on the solvent, a brominated arylborane gave the multiple helicene B2-TBPA (pyridine) or the oxadiborepin ODBE (THF) after intramolecular Yamamoto coupling.
The well-known red emitter tetrabenzo[de,hi,op,st]pentacene (TBPA) has been transformed into a bright blue emitter (B2-TBPA; λem = 472 nm; c-hexane) via substitutional doping with two boron atoms. In contrast to the electron-rich TBPA, which forms endo-peroxides with O2 under daylight, the benchtop-stable B2-TBPA is a good electron acceptor and undergoes reversible reduction at a moderate half-wave potential of E1/2 = –1.73 V (vs. FcH/FcH+; THF). Although the size of B2-TBPA falls within the nanoscale, the helically twisted compound readily dissolves in c-hexane and does not require solubilizing substituents. The synthesis of B2-TBPA is based on the nickel-mediated Yamamoto-type dehalogenation of tetrabrominated 9,10-di(naphth-1-yl)-9,10-dihydro-9,10-diboraanthracene. This intramolecular C–C heterocoupling reaction shows a remarkable solvent dependence: B2-TBPA forms only in pyridine (79% yield), whereas an oxadiborepin is obtained from THF solutions (ODBE, 81%; the reaction mixture is quenched with air in both cases). Insight into the corresponding reaction mechanism was gained from the isolation of intermediates and an investigation of their chemical properties. ODBE is an interesting blue emitter in its own right. Furthermore, it can be ring-opened with excess BBr3 at the B–O–B moiety to afford a dimeric borabenzo[de]anthracene.
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Affiliation(s)
- Julian Radtke
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Strasse 7 , D-60438 Frankfurt (Main) , Germany .
| | - Kai Schickedanz
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Strasse 7 , D-60438 Frankfurt (Main) , Germany .
| | - Marcel Bamberg
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Strasse 7 , D-60438 Frankfurt (Main) , Germany .
| | - Luigi Menduti
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Strasse 7 , D-60438 Frankfurt (Main) , Germany .
| | - Dieter Schollmeyer
- Institute of Organic Chemistry , Johannes Gutenberg University Mainz , Duesbergweg 10-14 , D-55128 Mainz , Germany
| | - Michael Bolte
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Strasse 7 , D-60438 Frankfurt (Main) , Germany .
| | - Hans-Wolfram Lerner
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Strasse 7 , D-60438 Frankfurt (Main) , Germany .
| | - Matthias Wagner
- Institut für Anorganische Chemie , Goethe-Universität Frankfurt , Max-von-Laue-Strasse 7 , D-60438 Frankfurt (Main) , Germany .
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23
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Chen CH, Gabbaï FP. Large-bite diboranes for the μ(1,2) complexation of hydrazine and cyanide. Chem Sci 2018; 9:6210-6218. [PMID: 30090308 PMCID: PMC6062845 DOI: 10.1039/c8sc01877d] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 05/27/2018] [Indexed: 01/15/2023] Open
Abstract
As part of our interest in the chemistry of polydentate Lewis acids as hosts for diatomic molecules, we have investigated the synthesis and coordination chemistry of bidentate boranes that feature a large boron-boron separation. In this paper, we describe the synthesis of a new example of such a diborane, namely 1,8-bis(dimesitylboryl)triptycene (2) and compare its properties to those of the recently reported 1,8-bis(dimesitylboryl)biphenylene (1). These comparative studies reveal that these two diboranes feature some important differences. As indicated by cyclic voltammetry, 1 is more electron deficient than 2; it also adopts a more compact and rigid structure with a boron-boron separation (4.566(5) Å) shorter by ∼1 Å than that in 2 (5.559(4) Å). These differences appear to dictate the coordination behaviour of these two compounds. While 2 remains inert toward hydrazine, we observed that 1 forms a very stable μ(1,2) hydrazine complex which can also be obtained by phase transfer upon layering a solution of 1 with a dilute aqueous hydrazine solution. The stability of this complex is further reflected by its lack of reaction with benzaldehyde at room temperature. We have also investigated the behaviour of 1 and 2 toward anions. In MeOH/CHCl3 (1/1 vol) both compounds selectively bind cyanide to form the corresponding μ(1,2) chelate complexes with a B-C[triple bond, length as m-dash]N-B bridge at their cores. Competition experiments in protic media show that the anionic cyanide complex formed by 1 is the most stable, with no evidence of decomplexation even in the presence of (C6F5)3B.
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Affiliation(s)
- Chang-Hong Chen
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , USA .
| | - François P Gabbaï
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , USA .
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24
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Blons C, Duval M, Delcroix D, Olivier‐Bourbigou H, Mallet‐Ladeira S, Sosa Carrizo ED, Miqueu K, Amgoune A, Bourissou D. Formation of a
peri
‐Bridged Phosphonio‐Naphthalene by Cu‐Mediated Phosphine–Aryl Coupling. Chemistry 2018; 24:11922-11925. [DOI: 10.1002/chem.201802579] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Indexed: 01/31/2023]
Affiliation(s)
- Charlie Blons
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
| | - Maryne Duval
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
| | - Damien Delcroix
- IFP Energies nouvellesRond-Point de l'Echangeur de Solaize BP3 69360 Solaize France
| | | | - Sonia Mallet‐Ladeira
- Institut de Chimie de Toulouse (ICT, FR 2599) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
| | - E. Daiann Sosa Carrizo
- CNRS/UNIV PAU & PAYS ADOURInstitut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM, UMR 5254) Hélioparc, 2 Avenue du Président Angot 64053 Pau Cedex 09 France
| | - Karinne Miqueu
- CNRS/UNIV PAU & PAYS ADOURInstitut des Sciences Analytiques et de Physico-Chimie pour l'Environnement et les Matériaux (IPREM, UMR 5254) Hélioparc, 2 Avenue du Président Angot 64053 Pau Cedex 09 France
| | - Abderrahmane Amgoune
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
| | - Didier Bourissou
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA, UMR 5069) 118 Route de Narbonne 31062 Toulouse Cedex 09 France
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25
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Wang T, Daniliuc CG, Mück-Lichtenfeld C, Kehr G, Erker G. Formation of Reactive π-Conjugated Frustrated N/B Pairs by Borane-Induced Propargyl Amine Rearrangement. J Am Chem Soc 2018; 140:3635-3643. [PMID: 29444567 DOI: 10.1021/jacs.7b11958] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
N-Propargyltetramethylpiperidine reacts with a series of trans-alkenyl-B(C6F5)2 compounds to give the substituted alkenyl-bridged frustrated N/B Lewis pairs 5. Their structures and spectroscopic features indicate a pronounced participation of the mesomeric s-trans-iminium/borata-alkene resonance form. The compounds are thought to be formed in a stepwise addition/rearrangement process which is initiated by a trans-1,2-amine/borane FLP addition to the carbon-carbon triple bond to generate a reactive zwitterionic aziridinium/alkenylborate intermediate. Subsequent alkenylborate attack leads to opening of the activated three-membered heterocycle with clean formation of the products 5a-c. Treatment of the propargyl-TMP substrate with B(C6F5)3 gave a stable example of such an aziridinium/borate betaine, which was isolated and amply characterized. The products 5a-c are active N/B FLPs. They split dihydrogen heterolytically under mild conditions to give the respective NH+/BH- products 9a-c. These contain Z-configurated core C═C double bonds, which indicates rotational equilibration around the central C-C bond of 5a-c during this reaction. Structural and chemical features of the 5c system were analyzed by DFT calculations.
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Affiliation(s)
- Tongdao Wang
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Christian Mück-Lichtenfeld
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut , Westfälische Wilhelms-Universität Münster , Corrensstraße 40 , 48149 Münster , Germany
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26
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Wang L, Jian Z, Daniliuc CG, Kehr G, Erker G. Formation of borata-alkene/iminium zwitterions by ynamine hydroboration. Dalton Trans 2018; 47:10853-10856. [DOI: 10.1039/c8dt02435a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ynamine TMP–CC–CH3 adds HB(C6F5)2 to give the unsaturated C2-bridged N/B FLP, which shows a marked participation of the mesomeric zwitterionic borata-alkene/iminium form.
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Affiliation(s)
- Long Wang
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Zhongbao Jian
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
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27
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Wang T, Kohrt S, Daniliuc CG, Kehr G, Erker G. Borata-Wittig olefination reactions of ketones, carboxylic esters and amides with bis(pentafluorophenyl)borata-alkene reagents. Org Biomol Chem 2017; 15:6223-6232. [DOI: 10.1039/c7ob01591g] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Borata-alkenes containing the B(C6F5)2 unit are employed in borata-Wittig olefination reactions.
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Affiliation(s)
- Tongdao Wang
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Sonja Kohrt
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- 48149 Münster
- Germany
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28
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29
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Kohrt S, Kehr G, Daniliuc CG, Rojas RS, Rieger B, Troll C, Erker G. Borata-Alkene Derived Syntheses of (F5C6)2B-Substituted Bis(indenyl) Group 4 Metal Complexes. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00427] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sonja Kohrt
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität, Corrensstraße 40, 48149 Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität, Corrensstraße 40, 48149 Münster, Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität, Corrensstraße 40, 48149 Münster, Germany
| | - René S. Rojas
- Departamento
de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
| | - Bernhard Rieger
- WACKER-Lehrstuhl
für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
| | - Carsten Troll
- WACKER-Lehrstuhl
für Makromolekulare Chemie, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
| | - Gerhard Erker
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität, Corrensstraße 40, 48149 Münster, Germany
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30
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Zheng Y, Xiong J, Sun Y, Pan X, Wu J. Stepwise Reduction of 9,10-Bis(dimesitylboryl)anthracene. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505766] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Zheng Y, Xiong J, Sun Y, Pan X, Wu J. Stepwise Reduction of 9,10‐Bis(dimesitylboryl)anthracene. Angew Chem Int Ed Engl 2015; 54:12933-6. [DOI: 10.1002/anie.201505766] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 07/22/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Yang Zheng
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (P.R. China)
| | - Jiao Xiong
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (P.R. China)
| | - Yangyang Sun
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (P.R. China)
| | - Xiaobo Pan
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (P.R. China)
| | - Jincai Wu
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000 (P.R. China)
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32
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McDonald SM, Mellerup SK, Peng J, Yang D, Li Q, Wang S. Thermal and Photolytic Transformation of NHC–B,N‐Heterocycles: Controlled Generation of Blue Fluorescent 1,3‐Azaborinine Derivatives and 1
H
‐Imidazo[1,2‐a]indoles by External Stimuli. Chemistry 2015; 21:13961-70. [DOI: 10.1002/chem.201502385] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Indexed: 01/07/2023]
Affiliation(s)
- Sean M. McDonald
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Soren K. Mellerup
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Jinbao Peng
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Dengtao Yang
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
| | - Quan‐Song Li
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion, Materials, School of Chemistry, Beijing Institute of Technology, Beijing, 100081 (P.R. China)
| | - Suning Wang
- Department of Chemistry, Queen's University, Kingston, Ontario, K7M 3N6 (Canada)
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion, Materials, School of Chemistry, Beijing Institute of Technology, Beijing, 100081 (P.R. China)
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Landmann J, Sprenger JAP, Hailmann M, Bernhardt-Pitchougina V, Willner H, Ignat'ev N, Bernhardt E, Finze M. The Hexacyanodiborane(6) Dianion [B2(CN)6]2−. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/anie.201504579] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Landmann J, Sprenger JAP, Hailmann M, Bernhardt-Pitchougina V, Willner H, Ignat'ev N, Bernhardt E, Finze M. Das Hexacyanodiboran(6)-Dianion [B2(CN)6]2−. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504579] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Tirfoin R, Abdalla JAB, Aldridge S. Bifunctional Indenyl-Derived Receptors for Fluoride Chelation and Detection. Chemistry 2015; 21:11813-24. [DOI: 10.1002/chem.201501547] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Indexed: 11/07/2022]
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Kohrt S, Dachwitz S, Daniliuc CG, Kehr G, Erker G. Stabilized borata-alkene formation: structural features, reactions and the role of the counter cation. Dalton Trans 2015; 44:21032-40. [DOI: 10.1039/c5dt04058b] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A stable borata-alkene was prepared starting from dimethylbenzofulvene and Piers' borane [HB(C6F5)2]. It undergoes a cycloaddiiton reaction with chalcone.
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Affiliation(s)
- Sonja Kohrt
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Steffen Dachwitz
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
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37
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Moquist P, Chen GQ, Mück-Lichtenfeld C, Bussmann K, Daniliuc CG, Kehr G, Erker G. α-CH acidity of alkyl-B(C 6F 5) 2 compounds - the role of stabilized borata-alkene formation in frustrated Lewis pair chemistry. Chem Sci 2014; 6:816-825. [PMID: 28936322 PMCID: PMC5592807 DOI: 10.1039/c4sc01711k] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 09/26/2014] [Indexed: 12/04/2022] Open
Abstract
Alkyl–B(C6F5)2 boranes are markedly α-CH-acidic. Using DFT we have calculated the pKa-values of a series of examples. Typically, (C6F5)2B–CH3 [pKa (calcd) = 18.3 in DMSO, 16.2 in dichloromethane] is almost as CH-acidic as cyclopentadiene.
Alkyl–B(C6F5)2 boranes are markedly α-CH-acidic. Using DFT we have calculated the pKa-values of a series of examples. Typically, (C6F5)2B–CH3 [pKa (calcd) = 18.3 in DMSO, 16.2 in dichloromethane] is almost as CH-acidic as cyclopentadiene. However, this α-CH–B(C6F5)2 acidity is in most cases not sufficient to allow for internal proton transfer in vicinal phosphane/borane frustrated Lewis pairs (FLPs). An exception is the slightly endergonic (+0.3 kcal mol–1) tautomerization of the in situ generated indane derived 1,3-P/B FLP 6 to its zwitterionic borata-alkene/phosphonium isomer 7, which was successfully trapped by Piers' borane [HB(C6F5)2] to yield the stable product 8. The pronounced α-CH[B] carbanion stabilization can be used synthetically. We have found that the dienyl borane E-H2C
Created by potrace 1.16, written by Peter Selinger 2001-2019
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C(Me)CHCHB(C6F5)2 undergoes clean, thermally induced 1,4-hydrophosphination reactions with HPR2 (R: phenyl, mesityl, or t-butyl) reagents. α-CHB(C6F5)2 carbanion (i.e. borata-alkene) stabilization in the respective intermediates probably plays a decisive role in these reactions.
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Affiliation(s)
- Philip Moquist
- Organisch-Chemisches Institut , Universität Münster , Corrensstrasse 40 , 48149 Münster , Germany .
| | - Guo-Qiang Chen
- Organisch-Chemisches Institut , Universität Münster , Corrensstrasse 40 , 48149 Münster , Germany .
| | | | - Kathrin Bussmann
- Organisch-Chemisches Institut , Universität Münster , Corrensstrasse 40 , 48149 Münster , Germany .
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut , Universität Münster , Corrensstrasse 40 , 48149 Münster , Germany .
| | - Gerald Kehr
- Organisch-Chemisches Institut , Universität Münster , Corrensstrasse 40 , 48149 Münster , Germany .
| | - Gerhard Erker
- Organisch-Chemisches Institut , Universität Münster , Corrensstrasse 40 , 48149 Münster , Germany .
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38
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Feng PY, Liu YH, Lin TS, Peng SM, Chiu CW. Redox Chemistry of a Hydroxyphenyl-Substituted Borane. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403247] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Feng PY, Liu YH, Lin TS, Peng SM, Chiu CW. Redox chemistry of a hydroxyphenyl-substituted borane. Angew Chem Int Ed Engl 2014; 53:6237-40. [PMID: 24782406 DOI: 10.1002/anie.201403247] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Indexed: 11/10/2022]
Abstract
Chemical reduction of a hydroxyphenyl-substituted borane triggers a sequential electron- and intramolecular hydrogen-atom-transfer process to afford a hydridoborate phenoxide dianion. On the other hand, hydrogen-atom abstraction of the borane leads to the isolation of a neutral borylated phenoxyl radical, which can be transformed to the corresponding benzoquinone borataalkene derivative by reduction with cobaltocene.
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Affiliation(s)
- Po-Yeng Feng
- Department of Chemistry, National Taiwan University, No.1, Sec. 4, Roosevelt Rd., Taipei, 10617 (Taiwan)
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40
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Metal-free binding and coupling of carbon monoxide at a boron–boron triple bond. Nat Chem 2013; 5:1025-8. [DOI: 10.1038/nchem.1778] [Citation(s) in RCA: 148] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2013] [Accepted: 09/05/2013] [Indexed: 01/09/2023]
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Bauer J, Braunschweig H, Hörl C, Radacki K, Wahler J. Synthesis of Zwitterionic Cobaltocenium Borate and Borata-alkene Derivatives from a Borole-Radical Anion. Chemistry 2013; 19:13396-401. [DOI: 10.1002/chem.201302201] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Indexed: 11/11/2022]
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Kushida T, Yamaguchi S. Boracyclophanes: Modulation of the σ/π Character in Boron-Benzene Interactions. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303830] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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43
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Kushida T, Yamaguchi S. Boracyclophanes: Modulation of the σ/π Character in Boron-Benzene Interactions. Angew Chem Int Ed Engl 2013; 52:8054-8. [DOI: 10.1002/anie.201303830] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Indexed: 11/10/2022]
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44
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Zhao H, Leamer LA, Gabbaï FP. Anion capture and sensing with cationic boranes: on the synergy of Coulombic effects and onium ion-centred Lewis acidity. Dalton Trans 2013; 42:8164-78. [DOI: 10.1039/c3dt50491c] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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45
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Aramaki Y, Omiya H, Yamashita M, Nakabayashi K, Ohkoshi SI, Nozaki K. Synthesis and Characterization of B-Heterocyclic π-Radical and Its Reactivity as a Boryl Radical. J Am Chem Soc 2012. [DOI: 10.1021/ja3094372] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yoshitaka Aramaki
- Department of Chemistry and
Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hideki Omiya
- Department of Chemistry and
Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Makoto Yamashita
- Department of Chemistry and
Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Koji Nakabayashi
- Department of Chemistry, School
of Science, The University of Tokyo, 7-3-1
Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shin-ichi Ohkoshi
- Department of Chemistry, School
of Science, The University of Tokyo, 7-3-1
Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kyoko Nozaki
- Department of Chemistry and
Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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46
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Melaimi M, Gabbaï FP. Synthesis and Electrochemical Behavior of Mixed Organoboron/Organomercury Compounds. Z Anorg Allg Chem 2012. [DOI: 10.1002/zaac.201200098] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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47
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Zhao H, Gabbaı̈ FP. On the Synergy of Coulombic and Chelate Effects in Bidentate Diboranes: Synthesis and Anion Binding Properties of a Cationic 1,8-Diborylnaphthalene. Organometallics 2012. [DOI: 10.1021/om2012216] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Haiyan Zhao
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - François P. Gabbaı̈
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
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Lorbach A, Hübner A, Wagner M. Aryl(hydro)boranes: versatile building blocks for boron-doped π-electron materials. Dalton Trans 2012; 41:6048-63. [DOI: 10.1039/c2dt30118k] [Citation(s) in RCA: 190] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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49
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Emslie DJH, Cowie BE, Kolpin KB. Acyclic boron-containing π-ligand complexes: η2- and η3-coordination modes. Dalton Trans 2011; 41:1101-17. [PMID: 21983808 DOI: 10.1039/c1dt11271f] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyclic boron-containing π-ligands such as boratabenzenes and borollides are well established, in particular as supporting ligands. By contrast, the chemistry of acyclic boron-containing π-ligands has remained relatively unexplored, presumably in part due to the higher reactivity of acyclic π-ligands relative to cyclic analogues. This perspective is focused on the synthesis, structures and reactivity of isolated transition metal complexes bearing η(n)-coordinated (n = 2 or 3) acyclic boron-containing ligands. Both monometallic and multimetallic compounds are included, and are discussed with an emphasis on metal-ligand and intraligand bonding and parallels with hydrocarbon π-ligand complexes.
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Affiliation(s)
- David J H Emslie
- Department of Chemistry, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada.
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Tsurusaki A, Sasamori T, Wakamiya A, Yamaguchi S, Nagura K, Irle S, Tokitoh N. Synthesis of 1-Phospha-2-boraacenaphthenes: Reductive 1,2-Aryl Migration of 1-Diarylboryl-8-dichlorophosphinonaphthalenes. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104971] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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