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Litle ED, Gabbaï FP. Metal→Carbon Dative Bonding. Angew Chem Int Ed Engl 2022; 61:e202201841. [DOI: 10.1002/anie.202201841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Indexed: 11/10/2022]
Affiliation(s)
- Elishua D. Litle
- Department of Chemistry Texas A&M University College Station TX 77843 USA
| | - François P. Gabbaï
- Department of Chemistry Texas A&M University College Station TX 77843 USA
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2
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Litle ED, Gabbaï FP. Metal→Carbon Dative Bonding. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202201841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Elishua D. Litle
- Department of Chemistry Texas A&M University College Station TX 77843 USA
| | - François P. Gabbaï
- Department of Chemistry Texas A&M University College Station TX 77843 USA
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3
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Guo R, Zhang X, Li T, Li Q, Ruiz DA, Liu LL, Tung CH, Kong L. Unraveling the reactivity of a cationic iminoborane: avenues to unusual boron cations. Chem Sci 2022; 13:2303-2309. [PMID: 35310477 PMCID: PMC8864711 DOI: 10.1039/d2sc00002d] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Accepted: 01/26/2022] [Indexed: 11/21/2022] Open
Abstract
A cationic terminal iminoborane [Mes*N
Created by potrace 1.16, written by Peter Selinger 2001-2019
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B ← IPr2Me2][AlBr4] (3+[AlBr4]−) (Mes* = 2,4,6-tri-tert-butylphenyl and IPr2Me2 = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) has been synthesized and characterized. The employment of an aryl group and N-heterocyclic carbene (NHC) ligand enables 3+[AlBr4]− to exhibit both B-centered Lewis acidity and BN multiple bond reactivities, thus allowing for the construction of tri-coordinate boron cations 5+–12+. More importantly, initial reactions involving coordination, addition, and [2 + 3] cycloadditions have been observed for the cationic iminoborane, demonstrating the potential to build numerous organoboron species via several synthetic routes. An NHC-stabilized aryliminoboryl cation exhibits both boron-centered Lewis acidity and multiple bond reactivity and could be utilized as an effective synthon for unusual cationic boron species.![]()
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Affiliation(s)
- Rui Guo
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Xin Zhang
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen 518055 P. R. China
| | - Tong Li
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Qianli Li
- School of Chemistry and Chemical Engineering, Liaocheng University Liaocheng 252059 P. R. China
| | - David A Ruiz
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen 518055 P. R. China
| | - Liu Leo Liu
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen 518055 P. R. China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Lingbing Kong
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China .,State Key Laboratory of Elemento-Organic Chemistry, Nankai University Tianjin 300071 P. R. China
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4
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Zhang X, Liu LL. A Free Aluminylene with Diverse σ‐Donating and Doubly σ/π‐Accepting Ligand Features for Transition Metals**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202111975] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Xin Zhang
- Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen 518055 China
| | - Liu Leo Liu
- Department of Chemistry and Shenzhen Grubbs Institute Southern University of Science and Technology Shenzhen 518055 China
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5
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Zhang X, Liu LL. A Free Aluminylene with Diverse σ-Donating and Doubly σ/π-Accepting Ligand Features for Transition Metals*. Angew Chem Int Ed Engl 2021; 60:27062-27069. [PMID: 34614275 DOI: 10.1002/anie.202111975] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Revised: 09/26/2021] [Indexed: 12/15/2022]
Abstract
We report herein the synthesis, characterization, and coordination chemistry of a free N-aluminylene, namely a carbazolylaluminylene 2 b. This species is prepared via a reduction reaction of the corresponding carbazolyl aluminium diiodide. The coordination behavior of 2 b towards transition metal centers (W, Cr) is shown to afford a series of novel aluminylene complexes 3-6 with diverse coordination modes. We demonstrate that the tri-active ambiphilic Al center in 2 b can behave as: 1. a σ-donating and doubly π-accepting ligand; 2. a σ-donating, σ-accepting and π-accepting ligand; and 3. a σ-donating and doubly σ-accepting ligand. Additionally, we show ligand exchange at the aluminylene center providing access to the modulation of electronic properties of transition metals without changing the coordinated atoms. Investigations of 2 b with IDippCuCl (IDipp=1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) show an unprecedented aluminylene-alumanyl transformation leading to a rare terminal Cu-alumanyl complex 8. The electronic structures of such complexes and the mechanism of the aluminylene-alumanyl transformation are investigated through density functional theory (DFT) calculations.
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Affiliation(s)
- Xin Zhang
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
| | - Liu Leo Liu
- Department of Chemistry and Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen, 518055, China
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6
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7
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Ríos P, Fernández‐de‐Córdova FJ, Borge J, Curado N, Lledós A, Conejero S. Ligand Effects in Carbon−Boron Coupling Processes Mediated by σ‐BH Platinum Complexes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Pablo Ríos
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica, CSIC and Universidad de Sevilla Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/Américo Vespucio 49 41092 Sevilla Spain
| | - Francisco José Fernández‐de‐Córdova
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica, CSIC and Universidad de Sevilla Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/Américo Vespucio 49 41092 Sevilla Spain
| | - Javier Borge
- Departamento de Quimica Física y Analítica Centro de Innovación en Química Avanzada (ORFEO-CINQA) Facultad de Química Universidad de Oviedo C/Julián Clavería 8 33006 Oviedo Spain
| | - Natalia Curado
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica, CSIC and Universidad de Sevilla Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/Américo Vespucio 49 41092 Sevilla Spain
| | - Agustí Lledós
- Departament de Química Centro de Innovación en Química Avanzada (ORFEO-CINQA) Universitat Autònoma de Barcelona Edifici Cn 08193 Cerdanyola del Vallés Spain
| | - Salvador Conejero
- Instituto de Investigaciones Químicas (IIQ) Departamento de Química Inorgánica, CSIC and Universidad de Sevilla Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/Américo Vespucio 49 41092 Sevilla Spain
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8
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Ríos P, Martín-de la Calle R, Vidossich P, Fernández-de-Córdova FJ, Lledós A, Conejero S. Reversible carbon-boron bond formation at platinum centers through σ-BH complexes. Chem Sci 2020; 12:1647-1655. [PMID: 34163924 PMCID: PMC8179255 DOI: 10.1039/d0sc05522k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A reversible carbon-boron bond formation has been observed in the reaction of the coordinatively unsaturated, cyclometalated, Pt(ii) complex [Pt(I t BuiPr')(I t BuiPr)][BArF], 1, with tricoordinated boranes HBR2. X-ray diffraction studies provided structural snapshots of the sequence of reactions involved in the process. At low temperature, we observed the initial formation of the unprecedented σ-BH complexes [Pt(HBR2)(I t BuiPr')(I t BuiPr)][BArF], one of which has been isolated. From -15 to +10 °C, the σ-BH species undergo a carbon-boron coupling process leading to the platinum hydride derivative [Pt(H)(I t BuiPr-BR2)(I t BuiPr)][BArF], 4. Surprisingly, these compounds are thermally unstable undergoing carbon-boron bond cleavage at room temperature that results in the 14-electron Pt(ii) boryl species [Pt(BR2)(I t BuiPr)2][BArF], 2. This unusual reaction process has been corroborated by computational methods, which indicate that the carbon-boron coupling products 4 are formed under kinetic control whereas the platinum boryl species 2, arising from competitive C-H bond coupling, are thermodynamically more stable. These findings provide valuable information about the factors governing productive carbon-boron coupling reactions at transition metal centers.
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Affiliation(s)
- Pablo Ríos
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Américo Vespucio 49 Sevilla 41092 Spain
| | - Rocío Martín-de la Calle
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Américo Vespucio 49 Sevilla 41092 Spain
| | - Pietro Vidossich
- Molecular Modeling & Drug Discovery Laboratory, Istituto Italiano di Tecnologia Via Morego 30 16163 Genoa Italy
| | - Francisco José Fernández-de-Córdova
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Américo Vespucio 49 Sevilla 41092 Spain
| | - Agustí Lledós
- Departament de Química, Universitat Autònoma de Barcelona, Edifici Cn Cerdanyola del Vallès 08193 Spain
| | - Salvador Conejero
- Instituto de Investigaciones Químicas (IIQ), Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Centro de Innovación en Química Avanzada (ORFEO-CINQA) C/ Américo Vespucio 49 Sevilla 41092 Spain
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9
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Brunecker C, Müssig JH, Arrowsmith M, Fantuzzi F, Stoy A, Böhnke J, Hofmann A, Bertermann R, Engels B, Braunschweig H. Boranediyl- and Diborane(4)-1,2-diyl-Bridged Platinum A-Frame Complexes. Chemistry 2020; 26:8518-8523. [PMID: 32196775 PMCID: PMC7384048 DOI: 10.1002/chem.202001168] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 03/20/2020] [Indexed: 11/06/2022]
Abstract
Diplatinum A-frame complexes with a bridging (di)boron unit in the apex position were synthesized in a single step by the double oxidative addition of dihalo(di)borane precursors at a bis(diphosphine)-bridged Pt0 2 complex. While structurally analogous to well-known μ-borylene complexes, in which delocalized dative three-center-two-electron M-B-M bonding prevails, theoretical investigations into the nature of Pt-B bonding in these A-frame complexes show them to be rare dimetalla(di)boranes displaying two electron-sharing Pt-B σ-bonds. This is experimentally reflected in the low kinetic stability of these compounds, which are prone to loss of the (di)boron bridgehead unit.
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Affiliation(s)
- Carina Brunecker
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
| | - Jonas H. Müssig
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
| | - Merle Arrowsmith
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
| | - Felipe Fantuzzi
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
- Institut für Physikalische und Theoretische ChemieJulius-Maximilians-Universität WürzburgEmil-Fischer-Straße 4297074WürzburgGermany
| | - Andreas Stoy
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
| | - Julian Böhnke
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
| | - Alexander Hofmann
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
| | - Rüdiger Bertermann
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
| | - Bernd Engels
- Institut für Physikalische und Theoretische ChemieJulius-Maximilians-Universität WürzburgEmil-Fischer-Straße 4297074WürzburgGermany
| | - Holger Braunschweig
- Institut für Anorganische Chemie andInstitute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität WüzburgAm Hubland97074WürzburgGermany
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10
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Lenczyk C, Roy DK, Nitsch J, Radacki K, Rauch F, Dewhurst RD, Bickelhaupt FM, Marder TB, Braunschweig H. Steric Effects Dictate the Formation of Terminal Arylborylene Complexes of Ruthenium from Dihydroboranes. Chemistry 2019; 25:13566-13571. [PMID: 31433081 PMCID: PMC7079023 DOI: 10.1002/chem.201902890] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Indexed: 11/08/2022]
Abstract
The steric and electronic properties of aryl substituents in monoaryl borohydrides (Li[ArBH3 ]) and dihydroboranes were systematically varied and their reactions with [Ru(PCy3 )2 HCl(H2 )] (Cy: cyclohexyl) were studied, resulting in bis(σ)-borane or terminal borylene complexes of ruthenium. These variations allowed for the investigation of the factors involved in the activation of dihydroboranes in the synthesis of terminal borylene complexes. The complexes were studied by multinuclear NMR spectroscopy, mass spectrometry, X-ray diffraction analysis, and density functional theory (DFT) calculations. The experimental and computational results suggest that the ortho-substitution of the aryl groups is necessary for the formation of terminal borylene complexes.
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Affiliation(s)
- Carsten Lenczyk
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Dipak Kumar Roy
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Discipline of Chemistry, Indian Institute of Technology Indore, Khandwa Road, Simrol, Indore, 453552, M.P., India
| | - Jörn Nitsch
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Krzysztof Radacki
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Florian Rauch
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Rian D Dewhurst
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - F Matthias Bickelhaupt
- Department of Theoretical Chemistry and Amsterdam Center for Multiscale Modeling (ACMM), Vrije Universiteit Amsterdam, De Boelelaan 1083, 1081 HV Amsterdam, (The Netherlands), and Institute for Molecules and Materials (IMM), Radboud University, Heyendaalseweg 135, 6525, AJ, Nijmegen, The Netherlands
| | - Todd B Marder
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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11
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Pranckevicius C, Herok C, Fantuzzi F, Engels B, Braunschweig H. Bindungsstärkende Rückbindung in Aminoborylen‐stabilisierten Aminoborylenen: an der Grenze zwischen Borylenen und Diborenen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Conor Pranckevicius
- Institut für anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institut für nachhaltige Chemie und Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Christoph Herok
- Institut für anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institut für nachhaltige Chemie und Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
| | - Felipe Fantuzzi
- Institut für anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institut für nachhaltige Chemie und Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institut für physikalische und theoretische Chemie Julius-Maximilians-Universität Würzburg Emil-Fischer Straße 42 97074 Würzburg Deutschland
| | - Bernd Engels
- Institut für physikalische und theoretische Chemie Julius-Maximilians-Universität Würzburg Emil-Fischer Straße 42 97074 Würzburg Deutschland
| | - Holger Braunschweig
- Institut für anorganische Chemie Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
- Institut für nachhaltige Chemie und Katalyse mit Bor Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Deutschland
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12
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Pranckevicius C, Herok C, Fantuzzi F, Engels B, Braunschweig H. Bond-Strengthening Backdonation in Aminoborylene-Stabilized Aminoborylenes: At the Intersection of Borylenes and Diborenes. Angew Chem Int Ed Engl 2019; 58:12893-12897. [PMID: 31241232 DOI: 10.1002/anie.201906671] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Indexed: 12/22/2022]
Abstract
Singly NHC-coordinated (aminoboryl)aminoborenium salts react with Na2 [Fe(CO)4 ] to yield stable coordination complexes of aminoborylene-stabilized aminoborylenes, which exhibit exceptional σ-donor properties. Upon photolytic CO extrusion from the metal center, the diboron ligand adopts a novel η3 -BBN coordination mode, where bond-strengthening backdonation from the metal center into the vacant B-B π-orbital is observed. This bonding situation can be alternatively described as a Fe-diaminodiborene complex. In a related reduction of CAAC-stabilized (aminoboryl)aminoborenium with KC8 , the reduced species can be captured with nucleophiles to form three-coordinate (diaminoboryl)borylenes, where both amino groups have migrated to the distal boron atom. Collectively, these reactions illustrate the isomeric flexibility imparted by amino groups on this reduced diboron system, thus opening multiple avenues of novel reactivity.
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Affiliation(s)
- Conor Pranckevicius
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Christoph Herok
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Felipe Fantuzzi
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Physical and Theoretical Chemistry, Julius-Maximilians-Universität Würzburg, Emil-Fischer Strasse 42, 97074, Würzburg, Germany
| | - Bernd Engels
- Institute for Physical and Theoretical Chemistry, Julius-Maximilians-Universität Würzburg, Emil-Fischer Strasse 42, 97074, Würzburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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13
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Kaneko T, Ninagawa H, Matsuoka M, Takao T. Synthesis and Properties of a Triruthenium Hydrido Complex Capped by a μ3-Oxoboryl Ligand. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takeshi Kaneko
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Hayato Ninagawa
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Moe Matsuoka
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Toshiro Takao
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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14
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Muessig JH, Prieschl D, Deißenberger A, Dewhurst RD, Dietz M, Jiménez-Halla JOC, Trumpp A, Wang SR, Brunecker C, Haefner A, Gärtner A, Thiess T, Böhnke J, Radacki K, Bertermann R, Marder TB, Braunschweig H. Reactivity of Tetrahalo- and Difluorodiboranes(4) toward Lewis Basic Platinum(0): Bis(boryl), Borylborato, and Doubly Boryl-Bridged Platinum Complexes. J Am Chem Soc 2018; 140:13056-13063. [PMID: 30222320 DOI: 10.1021/jacs.8b08428] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The reaction of the tetrahalodiboranes(4) B2F4, B2Cl4, and B2Br4 with a Lewis basic platinum(0) complex led to the isolation of the cis-bis(difluoroboryl) complex cis-[(Cy3P)2Pt(BF2)2] (1) and the novel borylborato complexes trans-[(Cy3P)2Pt{B(X)-BX3}] (2, X = Cl; 3, X = Br), respectively. The trans influence of the borylborato group was found to be one of the strongest ever observed experimentally. Furthermore, the reactivity of little-explored diaryldifluorodiboranes(4) F2B-BMes2 and the new derivative F2B-BAn2 (An = 9-anthryl) toward a range of platinum(0) complexes was investigated. Reactions with relatively nonbulky platinum(0) complexes led to the formation of unsymmetrical cis-bis(boryl) complexes cis-[(R3P)2Pt(BF2)(BMes2)] (6, R = Me; 7, R = Et) as well as the first example of a fourfold-unsymmetrical bis(boryl) complex, [(Me3P)(Cy3P)Pt(BF2)(BMes2)] (12). The use of a more bulky Pt complex provided access to the unprecedented dinuclear bis(boryl) complexes [{( iPr3P)Pt}2(μ-BF2)(μ-BAr2)] (8, Ar = Mes; 9, Ar = An), which feature two different μ2-bridging boryl ligands.
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Affiliation(s)
- Jonas H Muessig
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Dominic Prieschl
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Andrea Deißenberger
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Rian D Dewhurst
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Maximilian Dietz
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - J Oscar C Jiménez-Halla
- Departamento de Química, División de Ciencias Naturales y Exactas , Universidad de Guanajuato , Noria Alta S/N, Col. Noria Alta , 36050 Guanajuato , GTO , Mexico
| | - Alexandra Trumpp
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Sunewang R Wang
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Carina Brunecker
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Alena Haefner
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Annalena Gärtner
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Torsten Thiess
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Julian Böhnke
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Krzysztof Radacki
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Rüdiger Bertermann
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Todd B Marder
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Am Hubland , 97074 Würzburg , Germany
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15
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Riddlestone IM, Kraft A, Schaefer J, Krossing I. Die Schöne (WCA) und das (kationische) Biest: Neues aus der Chemie von und mit schwach koordinierenden Anionen. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201710782] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ian M. Riddlestone
- Institut für Anorganische und Analytische Chemie; Freiburger Materialforschungszentrum (FMF); Universität Freiburg; Albertstraße 21 79104 Freiburg Deutschland
| | - Anne Kraft
- Institut für Anorganische und Analytische Chemie; Freiburger Materialforschungszentrum (FMF); Universität Freiburg; Albertstraße 21 79104 Freiburg Deutschland
| | - Julia Schaefer
- Institut für Anorganische und Analytische Chemie; Freiburger Materialforschungszentrum (FMF); Universität Freiburg; Albertstraße 21 79104 Freiburg Deutschland
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie; Freiburger Materialforschungszentrum (FMF); Universität Freiburg; Albertstraße 21 79104 Freiburg Deutschland
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16
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Riddlestone IM, Kraft A, Schaefer J, Krossing I. Taming the Cationic Beast: Novel Developments in the Synthesis and Application of Weakly Coordinating Anions. Angew Chem Int Ed Engl 2018; 57:13982-14024. [PMID: 29266644 DOI: 10.1002/anie.201710782] [Citation(s) in RCA: 251] [Impact Index Per Article: 41.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2017] [Indexed: 12/11/2022]
Abstract
This Review gives a comprehensive overview of the most topical weakly coordinating anions (WCAs) and contains information on WCA design, stability, and applications. As an update to the 2004 review, developments in common classes of WCA are included. Methods for the incorporation of WCAs into a given system are discussed and advice given on how to best choose a method for the introduction of a particular WCA. A series of starting materials for a large number of WCA precursors and references are tabulated as a useful resource when looking for procedures to prepare WCAs. Furthermore, a collection of scales that allow the performance of a WCA, or its underlying Lewis acid, to be judged is collated with some advice on how to use them. The examples chosen to illustrate WCA developments are taken from a broad selection of topics where WCAs play a role. In addition a section focusing on transition metal and catalysis applications as well as supporting electrolytes is also included.
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Affiliation(s)
- Ian M Riddlestone
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - Anne Kraft
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - Julia Schaefer
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
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17
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Pranckevicius C, Jimenéz-Halla JOC, Kirsch M, Krummenacher I, Braunschweig H. Complexation and Release of N-Heterocyclic Carbene-Aminoborylene Ligands from Group VI and VIII Metals. J Am Chem Soc 2018; 140:10524-10529. [PMID: 30048122 DOI: 10.1021/jacs.8b05398] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The coordination chemistry and stability of aminoborylene ligands bearing different N-heterocyclic carbene (NHC) stabilizing groups has been investigated with Group VI and VIII metals. NHC-aminoborylene complexes have been accessed via reduction of NHC-dihaloaminoborane adducts with Na2[M(CO) x] species (M = Fe, Ru, Cr, W). Imidazol-2-ylidene-stabilized aminoborylene ligands were found to afford thermally robust metal-borylene complexes, which are inert to oxidation, hydrolysis, and insertion of unsaturated substrates. Such ligands have additionally been demonstrated to be significantly more electron releasing than NHCs and other carbon-based ligands by infrared spectroscopy, and can be regarded as unique examples of highly nucleophilic borylene ligands isolobal to classical NHCs. In contrast, cyclic alkylaminocarbene (CAAC)-bound dihaloaminoboranes were found to be reduced by one or two electrons upon reaction with Na2[M(CO) x] species to form either a stable borane-centered radical, or the free CAAC-aminoborylene complex, which further reacts to form a carbonyl-stabilized aminoborylene. Borylene-to-CO migration was also observed upon reaction of a ruthenium imidazol-2-ylidene aminoborylene complex with B(C6F5)3, where the product borylene remains trapped by the Ru center.
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Affiliation(s)
- Conor Pranckevicius
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany
| | - J Oscar C Jimenéz-Halla
- Department of Chemistry, Division of Natural and Exact Sciences , Universidad de Guanajuato , Noria Alta s/n , 36050 Guanajuato , Mexico
| | - Marius Kirsch
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany.,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg, Am Hubland , 97074 Würzburg , Germany
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18
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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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19
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Hui Z, Watanabe T, Tobita H. Synthesis of Base-Stabilized Hydrido(hydroborylene)tungsten Complexes and Their Reactions with Terminal Alkynes To Give η3-Boraallyl Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00723] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zeping Hui
- Department of Chemistry,
Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Takahito Watanabe
- Department of Chemistry,
Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Hiromi Tobita
- Department of Chemistry,
Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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20
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Nutz M, Borthakur B, Dewhurst RD, Deißenberger A, Dellermann T, Schäfer M, Krummenacher I, Phukan AK, Braunschweig H. Synthesis and Trapping of Iminoboranes by M=B/C=N Bond Metathesis. Angew Chem Int Ed Engl 2017; 56:7975-7979. [DOI: 10.1002/anie.201703324] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Marco Nutz
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Bitupon Borthakur
- Department of Chemical Sciences; Tezpur University; Napaam 784028 Assam India
| | - Rian D. Dewhurst
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Andrea Deißenberger
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Theresa Dellermann
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Marius Schäfer
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Ashwini K. Phukan
- Department of Chemical Sciences; Tezpur University; Napaam 784028 Assam India
| | - Holger Braunschweig
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
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21
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22
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Scherpf T, Feichtner K, Gessner VH. Using Ylide Functionalization to Stabilize Boron Cations. Angew Chem Int Ed Engl 2017; 56:3275-3279. [PMID: 28185370 PMCID: PMC5363341 DOI: 10.1002/anie.201611677] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 01/26/2017] [Indexed: 11/17/2022]
Abstract
The metalated ylide YNa [Y=(Ph3 PCSO2 Tol)- ] was employed as X,L-donor ligand for the preparation of a series of boron cations. Treatment of the bis-ylide functionalized borane Y2 BH with different trityl salts or B(C6 F5 )3 for hydride abstraction readily results in the formation of the bis-ylide functionalized boron cation [Y-B-Y]+ (2). The high donor capacity of the ylide ligands allowed the isolation of the cationic species and its characterization in solution as well as in solid state. DFT calculations demonstrate that the cation is efficiently stabilized through electrostatic effects as well as π-donation from the ylide ligands, which results in its high stability. Despite the high stability of 2 [Y-B-Y]+ serves as viable source for the preparation of further borenium cations of type Y2 B+ ←LB by addition of Lewis bases such as amines and amides. Primary and secondary amines react to tris(amino)boranes via N-H activation across the B-C bond.
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Affiliation(s)
- Thorsten Scherpf
- Chair of Inorganic Chemistry IIFaculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstraße 15044780BochumGermany
| | - Kai‐Stephan Feichtner
- Chair of Inorganic Chemistry IIFaculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstraße 15044780BochumGermany
| | - Viktoria H. Gessner
- Chair of Inorganic Chemistry IIFaculty of Chemistry and BiochemistryRuhr University BochumUniversitätsstraße 15044780BochumGermany
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23
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Scherpf T, Feichtner KS, Gessner VH. Using Ylide Functionalization to Stabilize Boron Cations. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611677] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Thorsten Scherpf
- Chair of Inorganic Chemistry II; Faculty of Chemistry and Biochemistry; Ruhr University Bochum; Universitätsstraße 150 44780 Bochum Germany
| | - Kai-Stephan Feichtner
- Chair of Inorganic Chemistry II; Faculty of Chemistry and Biochemistry; Ruhr University Bochum; Universitätsstraße 150 44780 Bochum Germany
| | - Viktoria H. Gessner
- Chair of Inorganic Chemistry II; Faculty of Chemistry and Biochemistry; Ruhr University Bochum; Universitätsstraße 150 44780 Bochum Germany
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24
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Werlé C, Dohm S, Bailly C, Karmazin L, Ricard L, Sieffert N, Pfeffer M, Hansen A, Grimme S, Djukic JP. trans–cis C–Pd–C rearrangement in hemichelates. Dalton Trans 2017; 46:8125-8137. [DOI: 10.1039/c7dt00872d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the transition state of the trans–cis isomerization process, hemichelation dynamically offers alternative coordination positions to the Pd center.
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25
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Braunschweig H, Celik MA, Dewhurst RD, Ferkinghoff K, Hermann A, Jimenez-Halla JOC, Kramer T, Radacki K, Shang R, Siedler E, Weißenberger F, Werner C. Interactions of Isonitriles with Metal-Boron Bonds: Insertions, Coupling, Ring Formation, and Liberation of Monovalent Boron. Chemistry 2016; 22:11736-44. [PMID: 27388206 DOI: 10.1002/chem.201600793] [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: 02/19/2016] [Indexed: 11/08/2022]
Abstract
Boryl, borylene, and base-stabilized borylene complexes of manganese and iron undergo a range of different reactions when treated with isonitriles including single, double, and partial isonitrile insertions into metal-boron bonds, ring formation, isonitrile coupling, and the liberation of new monovalent boron species. Two of the resulting cyclic species have also been found to react selectively with anhydrous HCl to form ring-opened products. The diverse isonitrile-promoted reactivity of transition-metal-boron compounds has been explored computationally.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.
| | - Mehmet Ali Celik
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Rian D Dewhurst
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Katharina Ferkinghoff
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Alexander Hermann
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - J Oscar C Jimenez-Halla
- Department of Chemistry (DCNE), Universidad de Guanajuato, Noria Alta s/n, 36050, Guanajuato, Mexico
| | - Thomas Kramer
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Rong Shang
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Eva Siedler
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Felix Weißenberger
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Christine Werner
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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26
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Saleh LMA, Dziedzic RM, Khan SI, Spokoyny AM. Forging Unsupported Metal–Boryl Bonds with Icosahedral Carboranes. Chemistry 2016; 22:8466-70. [DOI: 10.1002/chem.201601292] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Liban M. A. Saleh
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
| | - Rafal M. Dziedzic
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
| | - Saeed I. Khan
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
| | - Alexander M. Spokoyny
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
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27
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Riddlestone IM, McKay D, Gutmann MJ, Macgregor SA, Mahon MF, Sparkes HA, Whittlesey MK. Isolation of [Ru(IPr)2(CO)H]+ (IPr = 1,3-Bis(2,6-diisopropylphenyl)imidazol-2-ylidene) and Reactivity toward E–H (E = H, B) Bonds. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00173] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ian M. Riddlestone
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2
7AY, U.K
| | - David McKay
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | | | - Stuart A. Macgregor
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Mary F. Mahon
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2
7AY, U.K
| | - Hazel A. Sparkes
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
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28
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Troadec T, Tan SY, Wedge CJ, Rourke JP, Unwin PR, Chaplin AB. One-Electron Oxidation of [M(P(t) Bu3 )2 ] (M=Pd, Pt): Isolation of Monomeric [Pd(P(t) Bu3 )2 ](+) and Redox-Promoted C-H Bond Cyclometalation. Angew Chem Int Ed Engl 2016; 55:3754-7. [PMID: 26879233 PMCID: PMC4797707 DOI: 10.1002/anie.201511467] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Indexed: 11/25/2022]
Abstract
Oxidation of zero-valent phosphine complexes [M(P(t) Bu3 )2 ] (M=Pd, Pt) has been investigated in 1,2-difluorobenzene solution using cyclic voltammetry and subsequently using the ferrocenium cation as a chemical redox agent. In the case of palladium, a mononuclear paramagnetic Pd(I) derivative was readily isolated from solution and fully characterized (EPR, X-ray crystallography). While in situ electrochemical measurements are consistent with initial one-electron oxidation, the heavier congener undergoes C-H bond cyclometalation and ultimately affords the 14 valence-electron Pt(II) complex [Pt(κ(2) PC -P(t) Bu2 CMe2 CH2 )(P(t) Bu3 )](+) with concomitant formation of [Pt(P(t) Bu3 )2 H](+) .
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Affiliation(s)
- Thibault Troadec
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Sze-Yin Tan
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Christopher J Wedge
- Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Jonathan P Rourke
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Patrick R Unwin
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
| | - Adrian B Chaplin
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
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Engesser TA, Lichtenthaler MR, Schleep M, Krossing I. Reactive p-block cations stabilized by weakly coordinating anions. Chem Soc Rev 2016; 45:789-899. [PMID: 26612538 PMCID: PMC4758321 DOI: 10.1039/c5cs00672d] [Citation(s) in RCA: 222] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Indexed: 12/12/2022]
Abstract
The chemistry of the p-block elements is a huge playground for fundamental and applied work. With their bonding from electron deficient to hypercoordinate and formally hypervalent, the p-block elements represent an area to find terra incognita. Often, the formation of cations that contain p-block elements as central ingredient is desired, for example to make a compound more Lewis acidic for an application or simply to prove an idea. This review has collected the reactive p-block cations (rPBC) with a comprehensive focus on those that have been published since the year 2000, but including the milestones and key citations of earlier work. We include an overview on the weakly coordinating anions (WCAs) used to stabilize the rPBC and give an overview to WCA selection, ionization strategies for rPBC-formation and finally list the rPBC ordered in their respective group from 13 to 18. However, typical, often more organic ion classes that constitute for example ionic liquids (imidazolium, ammonium, etc.) were omitted, as were those that do not fulfill the - naturally subjective -"reactive"-criterion of the rPBC. As a rule, we only included rPBC with crystal structure and only rarely refer to important cations published without crystal structure. This collection is intended for those who are simply interested what has been done or what is possible, as well as those who seek advice on preparative issues, up to people having a certain application in mind, where the knowledge on the existence of a rPBC that might play a role as an intermediate or active center may be useful.
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Affiliation(s)
- Tobias A. Engesser
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) , Universität Freiburg , Albertstr. 21 , 79104 Freiburg , Germany .
| | - Martin R. Lichtenthaler
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) , Universität Freiburg , Albertstr. 21 , 79104 Freiburg , Germany .
| | - Mario Schleep
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) , Universität Freiburg , Albertstr. 21 , 79104 Freiburg , Germany .
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) , Universität Freiburg , Albertstr. 21 , 79104 Freiburg , Germany .
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30
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Troadec T, Tan SY, Wedge CJ, Rourke JP, Unwin PR, Chaplin AB. One-Electron Oxidation of [M(Pt
Bu3
)2
] (M=Pd, Pt): Isolation of Monomeric [Pd(Pt
Bu3
)2
]+
and Redox-Promoted C−H Bond Cyclometalation. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511467] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Thibault Troadec
- Department of Chemistry; University of Warwick; Gibbet Hill Road Coventry CV4 7AL UK
| | - Sze-yin Tan
- Department of Chemistry; University of Warwick; Gibbet Hill Road Coventry CV4 7AL UK
| | - Christopher J. Wedge
- Department of Physics; University of Warwick; Gibbet Hill Road Coventry CV4 7AL UK
| | - Jonathan P. Rourke
- Department of Chemistry; University of Warwick; Gibbet Hill Road Coventry CV4 7AL UK
| | - Patrick R. Unwin
- Department of Chemistry; University of Warwick; Gibbet Hill Road Coventry CV4 7AL UK
| | - Adrian B. Chaplin
- Department of Chemistry; University of Warwick; Gibbet Hill Road Coventry CV4 7AL UK
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Chapman AM, Flynn SR, Wass DF. Unexpected Formation of Early Late Heterobimetallic Complexes from Transition Metal Frustrated Lewis Pairs. Inorg Chem 2016; 55:1017-21. [DOI: 10.1021/acs.inorgchem.5b01424] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andy M. Chapman
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, United Kingdom
| | - Stephanie R. Flynn
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, United Kingdom
| | - Duncan F. Wass
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, United Kingdom
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32
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Hooper TN, Weller AS, Beattie NA, Macgregor SA. Dehydrocoupling of phosphine-boranes using the [RhCp*Me(PMe 3)(CH 2Cl 2)][BAr F4] precatalyst: stoichiometric and catalytic studies. Chem Sci 2015; 7:2414-2426. [PMID: 29997783 PMCID: PMC6003611 DOI: 10.1039/c5sc04150c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 12/19/2015] [Indexed: 01/08/2023] Open
Abstract
Detailed experimental and computational studies are reported on the fundamental B–H and P–H bond activation steps involved in the dehydrocoupling/dehydropolymerization of primary and secondary phosphine–boranes, H3B·PPhR′H (R = Ph, H), using the [RhCp*(PMe3)Me(ClCH2Cl)][BArF4] catalyst.
We report a detailed, combined experimental and computational study on the fundamental B–H and P–H bond activation steps involved in the dehydrocoupling/dehydropolymerization of primary and secondary phosphine–boranes, H3B·PPhR′H (R = Ph, H), using [RhCp*(PMe3)Me(ClCH2Cl)][BArF4], to either form polyphosphino-boranes [H2B·PPhH]n (Mn ∼ 15 000 g mol–1, PDI = 2.2) or the linear diboraphosphine H3B·PPh2BH2·PPh2H. A likely polymer-growth pathway of reversible chain transfer step-growth is suggested for H3B·PPhH2. Using secondary phosphine–boranes as model substrates a combined synthesis, structural (X-ray crystallography), labelling and computational approach reveals: initial bond activation pathways (B–H activation precedes P–H activation); key intermediates (phosphido-boranes, α-B-agostic base-stabilized boryls); and a catalytic route to the primary diboraphosphine (H3B·PPhHBH2·PPhH2). It is also shown that by changing the substituent at phosphorus (Ph or Cy versustBu) different final products result (phosphido-borane or base stabilized phosphino-borane respectively). These studies provide detailed insight into the pathways that are operating during dehydropolymerization.
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Affiliation(s)
- Thomas N Hooper
- Department of Chemistry , Chemistry Research Laboratories , University of Oxford , Mansfield Road , Oxford , OX1 3TA , UK .
| | - Andrew S Weller
- Department of Chemistry , Chemistry Research Laboratories , University of Oxford , Mansfield Road , Oxford , OX1 3TA , UK .
| | - Nicholas A Beattie
- Institute of Chemical Sciences , Heriot Watt University , Edinburgh , EH14 4AS , UK .
| | - Stuart A Macgregor
- Institute of Chemical Sciences , Heriot Watt University , Edinburgh , EH14 4AS , UK .
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Kelly CM, Kwon DH, Ferguson MJ, Bischof SM, Sydora OL, Ess DH, Stradiotto M, Turculet L. Synthesis and Reactivity of a Neutral, Three-Coordinate Platinum(II) Complex Featuring Terminal Amido Ligation. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201506871] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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Kelly CM, Kwon D, Ferguson MJ, Bischof SM, Sydora OL, Ess DH, Stradiotto M, Turculet L. Synthesis and Reactivity of a Neutral, Three‐Coordinate Platinum(II) Complex Featuring Terminal Amido Ligation. Angew Chem Int Ed Engl 2015; 54:14498-502. [DOI: 10.1002/anie.201506871] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Revised: 09/10/2015] [Indexed: 01/09/2023]
Affiliation(s)
- Colin M. Kelly
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4R2 (Canada)
| | - Doo‐Hyun Kwon
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602 (USA)
| | - Michael J. Ferguson
- X‐ray Crystallography Laboratory, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2 (Canada)
| | - Steven M. Bischof
- Research and Technology, Chevron Phillips Chemical Company LP, 1862 Kingwood Drive, Kingwood, TX 77339 (USA)
| | - Orson L. Sydora
- Research and Technology, Chevron Phillips Chemical Company LP, 1862 Kingwood Drive, Kingwood, TX 77339 (USA)
| | - Daniel H. Ess
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602 (USA)
| | - Mark Stradiotto
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4R2 (Canada)
| | - Laura Turculet
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia B3H 4R2 (Canada)
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Campos J, Ortega-Moreno L, Conejero S, Peloso R, López-Serrano J, Maya C, Carmona E. Reactivity of Cationic Agostic and Carbene Structures Derived from Platinum(II) Metallacycles. Chemistry 2015; 21:8883-96. [DOI: 10.1002/chem.201500756] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Indexed: 11/11/2022]
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Braunschweig H, Shang R. Reactivity of Transition-Metal Borylene Complexes: Recent Advances in B–C and B–B Bond Formation via Borylene Ligand Coupling. Inorg Chem 2015; 54:3099-106. [DOI: 10.1021/acs.inorgchem.5b00091] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Holger Braunschweig
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Rong Shang
- Institut für
Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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37
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Sharmila D, Mondal B, Ramalakshmi R, Kundu S, Varghese B, Ghosh S. First-Row Transition-Metal-Diborane and -Borylene Complexes. Chemistry 2015; 21:5074-83. [DOI: 10.1002/chem.201405585] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Indexed: 11/07/2022]
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38
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Braunschweig H, Celik MA, Dewhurst RD, Heid M, Hupp F, Sen SS. Stepwise isolation of low-valent, low-coordinate Sn and Pb mono- and dications in the coordination sphere of platinum. Chem Sci 2015; 6:425-435. [PMID: 28936301 PMCID: PMC5587986 DOI: 10.1039/c4sc02948h] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Accepted: 10/15/2014] [Indexed: 11/21/2022] Open
Abstract
Synthetic access to low-coordinate Pb mono- and dications is in general impeded due to their poor solubility and highly electrophilic nature. However, the electrophilicity of these cations can be tamed by attaching them to electron-rich transition metals. Following this principle we have isolated low-valent Pb mono- ([(Cy3P)2Pt-PbCl]2[AlCl4]2, 8a) and dications ([(Cy3P)2Pt(Pb)][AlCl4]2, 11) in the coordination sphere of platinum. The same approach then has been implemented for the isolation of analogous low-valent Sn mono- (7a) and dications (10). An energy decomposition analysis (EDA-NOCV) was performed to investigate the nature of Pt-Pb and Pb-Cl bonding in [(Cy3P)2Pt(PbCl2)] (2), 8a and 11. The results show that the Pt-Pb bonds in 8a and 11 are electron-sharing in nature, whereas that of the precursor 2 is a dative bond. The breakdown of attractive interactions in 2, 8a and 11 reveals that the ionic interactions in the analyzed Pt-Pb and Pb-Cl bonds are always stronger than the covalent interactions, except for the Pb-Cl bond in 8a. The calculated D3 dispersion energies show that dispersion interactions play a key role in the thermodynamic stability of 2, 8a and 11.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/ ;
| | - Mehmet Ali Celik
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/ ;
| | - Rian D Dewhurst
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/ ;
| | - Magdalena Heid
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/ ;
| | - Florian Hupp
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/ ;
| | - Sakya S Sen
- CSIR-National Chemical Laboratory , Pashan , Pune 411008 , India
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Roselló-Merino M, Rivada-Wheelaghan O, Ortuño MA, Vidossich P, Dı́ez J, Lledós A, Conejero S. Coordinatively Unsaturated T-Shaped Platinum(II) Complexes Stabilized by Small N-Heterocyclic Carbene Ligands. Synthesis and Cyclometalation. Organometallics 2014. [DOI: 10.1021/om500416n] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Marta Roselló-Merino
- Instituto de Investigaciones
Quı́micas
(IIQ), Departamento de Quı́mica Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Orestes Rivada-Wheelaghan
- Instituto de Investigaciones
Quı́micas
(IIQ), Departamento de Quı́mica Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Manuel A. Ortuño
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola
del Vallès, Spain
| | - Pietro Vidossich
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola
del Vallès, Spain
| | - Josefina Dı́ez
- Departamento de Quı́mica Orgánica
e Inorgánica, Universidad de Oviedo, C/Julián Clavería
8, 33006 Oviedo, Spain
| | - Agustı́ Lledós
- Departament de Quı́mica, Universitat Autònoma de Barcelona, 08193 Cerdanyola
del Vallès, Spain
| | - Salvador Conejero
- Instituto de Investigaciones
Quı́micas
(IIQ), Departamento de Quı́mica Inorgánica, CSIC and Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
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Rivada-Wheelaghan O, Roselló-Merino M, Ortuño MA, Vidossich P, Gutiérrez-Puebla E, Lledós A, Conejero S. Reactivity of coordinatively unsaturated bis(N-heterocyclic carbene) Pt(II) complexes toward H(2). Crystal structure of a 14-electron Pt(II) hydride complex. Inorg Chem 2014; 53:4257-68. [PMID: 24716606 DOI: 10.1021/ic500705t] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The reactivity toward H2 of coordinatively unsaturated Pt(II) complexes, stabilized by N-heterocyclic carbene (NHC) ligands, is herein analyzed. The cationic platinum complexes [Pt(NHC')(NHC)](+) (where NHC' stands for a cyclometalated NHC ligand) react very fast with H2 at room temperature, leading to hydrogenolysis of the Pt-CH2 bond and concomitant formation of hydride derivatives [PtH(NHC)2](+) or hydrido-dihydrogen complexes [PtH(H2)(NHC)2](+). The latter species release H2 when these compounds are subjected to vacuum. The X-ray structure of complex [PtH(IPr)2][SbF6] revealed its unsaturated nature, exhibiting a true T-shaped structure without stabilization by agostic interactions. Density functional theory calculations indicate that the binding and reaction of H2 in complexes [PtH(H2)(NHC)2](+) is more favored for derivatives bearing aryl-substituted NHCs (IPr, 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene and IMes = 1,3-dimesityl-1,3-dihydro-2H-imidazol-2-ylidene) than for those containing tert-butyl groups (I(t)Bu). This outcome is related to the higher close-range steric effects of the I(t)Bu ligands. Accordingly, H/D exchange reactions between hydrides [PtH(NHC)2](+) and D2 take place considerably faster for IPr and IMes* derivatives than for I(t)Bu ones. The reaction mechanisms for both H2 addition and H/D exchange processes depend on the nature of the NHC ligand, operating through oxidative addition transition states in the case of IPr and IMes* or by a σ-complex assisted-metathesis mechanism in the case of I(t)Bu.
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Affiliation(s)
- Orestes Rivada-Wheelaghan
- Departamento de Química Inorgánica, CSIC and Universidad de Sevilla, Instituto de Investigaciones Químicas (IIQ) , Avda. Américo Vespucio 49, 41092, Sevilla, Spain
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Brand J, Braunschweig H, Sen SS. B═B and B≡E (E = N and o) multiple bonds in the coordination sphere of late transition metals. Acc Chem Res 2014; 47:180-91. [PMID: 23952302 DOI: 10.1021/ar400106u] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Because of their unusual structural and bonding motifs, multiply bonded boron compounds are fundamentally important to chemists, leading to enormous research interest. To access these compounds, researchers have introduced sterically demanding ligands that provide kinetic as well as electronic stability. A conceptually different approach to the synthesis of such compounds involves the use of an electron-rich, coordinatively unsaturated transition metal fragment. To isolate the plethora of borane, boryl, and borylene complexes, chemists have also used the coordination sphere of transition metals to stabilize reactive motifs in these molecules. In this Account, we summarize our results showing that increasingly synthetically challenging targets such as iminoboryl (B≡N), oxoboryl (B≡O), and diborene (B═B) fragments can be stabilized in the coordination sphere of late transition metals. This journey began with the isolation of two new iminoboryl ligands trans-[(Cy3P)2(Br)M(B≡N(SiMe3))] (M = Pd, Pt) attached to palladium and platinum fragments. The synthesis involved oxidative addition of the B-Br bond in (Me3Si)2N═BBr2 to [M(PCy3)2] (M = Pt, Pd) and the subsequent elimination of Me3SiBr at room temperature. Variation of the metal, the metal-bound coligands, and the substituent at the nitrogen atom afforded a series of analogous iminoboryl complexes. Following the same synthetic strategy, we also synthesized the first oxoboryl complex trans-[(Cy3P)2BrPt(BO)]. The labile bromide ligand adjacent to platinum makes the complex a viable candidate for further substitution reactions, which led to a number of new oxoboryl complexes. In addition to allowing us to isolate these fundamental compounds, the synthetic strategy is very convenient and minimizes byproducts. We also discuss the reaction chemistry of these types of compounds. In addition to facilitating the isolation of compounds with B≡E (E = N, O) triple bonds, the platinum fragment can also stabilize a diborene (RB═BR) moiety, a bonding motif that thus far had only been accessible when stabilized by N-heterocyclic carbenes (NHCs). In the new π-diborene [(Et3P)2Pt(B2Dur2)] (Dur = 2,3,5,6-Me4-C6H) complex, the diborene ligand receives electron density from Pt, leading to a strong Pt-B bond and a B═B bond. We attribute this result to the very short B═B bond distance (1.51(2) Å) while coordinated to platinum. Overall, an increasing number of chemists are examining the chemistry of multiply bound boron compounds. The isolation of an oxoboryl complex is of special interest not only from a structural standpoint but also because of its orbital similarities to the ubiquitous CO ligand. Detailed computational studies of the π-diborene complex [(Et3P)2Pt(B2Dur2)] show that the bonding properties of this molecule violate the widely accepted Dewar-Chatt-Duncanson (DCD) bonding model.
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Affiliation(s)
- Johannes Brand
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Sakya S. Sen
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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Braunschweig H, Kramer T, Radacki K, Shang R, Siedler E, Werner C. Isolation of the key intermediates of base-promoted borylene–carbonyl coupling reactions. Chem Sci 2014. [DOI: 10.1039/c4sc00183d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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43
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Werlé C, Bailly C, Karmazin-Brelot L, Le Goff XF, Ricard L, Djukic JP. Hemichelation, a Way To Stabilize Electron-Unsaturated Complexes: The Case of T-Shaped Pd and Pt Metallacycles. J Am Chem Soc 2013; 135:17839-52. [DOI: 10.1021/ja4076327] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Christophe Werlé
- Institut de Chimie de Strasbourg, Université de Strasbourg, CNRS, 4 rue Blaise Pascal, F-67000 Strasbourg, France
- Département de Chimie, Ecole Polytechnique, CNRS, Route de Saclay, F-91128 Palaiseau cedex, France
| | - Corinne Bailly
- Institut de Chimie de Strasbourg, Université de Strasbourg, CNRS, 4 rue Blaise Pascal, F-67000 Strasbourg, France
- Département de Chimie, Ecole Polytechnique, CNRS, Route de Saclay, F-91128 Palaiseau cedex, France
| | - Lydia Karmazin-Brelot
- Institut de Chimie de Strasbourg, Université de Strasbourg, CNRS, 4 rue Blaise Pascal, F-67000 Strasbourg, France
- Département de Chimie, Ecole Polytechnique, CNRS, Route de Saclay, F-91128 Palaiseau cedex, France
| | - Xavier-Frédéric Le Goff
- Institut de Chimie de Strasbourg, Université de Strasbourg, CNRS, 4 rue Blaise Pascal, F-67000 Strasbourg, France
- Département de Chimie, Ecole Polytechnique, CNRS, Route de Saclay, F-91128 Palaiseau cedex, France
| | - Louis Ricard
- Institut de Chimie de Strasbourg, Université de Strasbourg, CNRS, 4 rue Blaise Pascal, F-67000 Strasbourg, France
- Département de Chimie, Ecole Polytechnique, CNRS, Route de Saclay, F-91128 Palaiseau cedex, France
| | - Jean-Pierre Djukic
- Institut de Chimie de Strasbourg, Université de Strasbourg, CNRS, 4 rue Blaise Pascal, F-67000 Strasbourg, France
- Département de Chimie, Ecole Polytechnique, CNRS, Route de Saclay, F-91128 Palaiseau cedex, France
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44
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Bissinger P, Braunschweig H, Damme A, Dewhurst RD, Kraft K, Kramer T, Radacki K. Base-Stabilized Boryl and Cationic Haloborylene Complexes of Iron. Chemistry 2013; 19:13402-7. [DOI: 10.1002/chem.201302263] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2013] [Indexed: 11/11/2022]
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45
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Braunschweig H, Brenner P, Radacki K. Wolfphos in Sheep's Clothing: The First Trinuclear Triboryl- and Other Boryl Platinum Complexes Featuring a Flexible Phosphine Ligand. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201200556] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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46
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Braunschweig H, Brenner P, Dewhurst RD, Jimenez-Halla JOC, Kupfer T, Rais D, Uttinger K. Maximierung von koordinativer und elektronischer Ungesättigtheit: dreifach koordinierte dikationische Platinkomplexe. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209717] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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47
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Braunschweig H, Brenner P, Dewhurst RD, Jimenez-Halla JOC, Kupfer T, Rais D, Uttinger K. Maximizing Coordinative and Electronic Unsaturation: Three-Coordinate Dicationic Platinum Complexes. Angew Chem Int Ed Engl 2013; 52:2981-4. [DOI: 10.1002/anie.201209717] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2012] [Indexed: 11/08/2022]
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48
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Braunschweig H, Dewhurst RD, Gessner VH. Transition metal borylene complexes. Chem Soc Rev 2013; 42:3197-208. [DOI: 10.1039/c3cs35510a] [Citation(s) in RCA: 176] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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49
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Ogawa H, Yamashita M. Platinum complexes bearing a boron-based PBP pincer ligand: synthesis, structure, and application as a catalyst for hydrosilylation of 1-decene. Dalton Trans 2013; 42:625-9. [DOI: 10.1039/c2dt31892j] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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50
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Walter MD, White PS, Brookhart M. Synthesis, structure and computational studies of a cationic T-shaped Pd-complex. NEW J CHEM 2013. [DOI: 10.1039/c3nj41145a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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