51
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Colebatch AL, McKay AI, Beattie NA, Macgregor SA, Weller AS. Fluoroarene Complexes with Small Bite Angle Bisphosphines: Routes to Amine-Borane and Aminoborylene Complexes. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700600] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Annie L. Colebatch
- Department of Chemistry; Chemistry Research Laboratory; University of Oxford; Mansfield Road OX1 3TA Oxford UK
| | - Alasdair I. McKay
- Department of Chemistry; Chemistry Research Laboratory; University of Oxford; Mansfield Road OX1 3TA Oxford UK
| | - Nicholas A. Beattie
- Institute of Chemical Sciences; Heriot Watt University; EH14 4AS Edinburgh UK
| | - Stuart A. Macgregor
- Institute of Chemical Sciences; Heriot Watt University; EH14 4AS Edinburgh UK
| | - Andrew S. Weller
- Department of Chemistry; Chemistry Research Laboratory; University of Oxford; Mansfield Road OX1 3TA Oxford UK
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52
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Less RJ, Hanf S, García-Rodríguez R, Bond AD, Wright DS. A [HN(BH═NH)2]2– Dianion, Isoelectronic with a β-Diketiminate. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00436] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert J. Less
- University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Schirin Hanf
- University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge CB2 1EW, U.K
- University of Leipzig, Department of Chemistry and Mineralogy, Institute of Inorganic Chemistry, Johannisallee 29, D-04103 Leipzig, Germany
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel, Delibes, 47011 Valladolid, Spain
| | - Andrew D. Bond
- University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Dominic S. Wright
- University of Cambridge, Department of Chemistry, Lensfield Road, Cambridge CB2 1EW, U.K
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53
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Turner JR, Resendiz-Lara DA, Jurca T, Schäfer A, Vance JR, Beckett L, Whittell GR, Musgrave RA, Sparkes HA, Manners I. Synthesis, Characterization, and Properties of Poly(aryl)phosphinoboranes Formed via Iron-Catalyzed Dehydropolymerization. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700120] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Joshua R. Turner
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | | | - Titel Jurca
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - André Schäfer
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - James R. Vance
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Laura Beckett
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - George R. Whittell
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Rebecca A. Musgrave
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Hazel A. Sparkes
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Ian Manners
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
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54
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Rossin A, Tuci G, Luconi L, Giambastiani G. Metal–Organic Frameworks as Heterogeneous Catalysts in Hydrogen Production from Lightweight Inorganic Hydrides. ACS Catal 2017. [DOI: 10.1021/acscatal.7b01495] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrea Rossin
- Istituto di Chimica dei Composti Organometallici, Consiglio Nazionale delle Ricerche (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Giulia Tuci
- Istituto di Chimica dei Composti Organometallici, Consiglio Nazionale delle Ricerche (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Lapo Luconi
- Istituto di Chimica dei Composti Organometallici, Consiglio Nazionale delle Ricerche (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
| | - Giuliano Giambastiani
- Istituto di Chimica dei Composti Organometallici, Consiglio Nazionale delle Ricerche (ICCOM-CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
- Kazan Federal University, Kremlyovskaya
Str. 18, 420008 Kazan, Russia
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55
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Erickson KA, Kiplinger JL. Catalytic Dehydrogenation of Dimethylamine Borane by Highly Active Thorium and Uranium Metallocene Complexes. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00967] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Karla A. Erickson
- Chemistry Division, Mail
Stop J514, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Jaqueline L. Kiplinger
- Chemistry Division, Mail
Stop J514, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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56
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Kwan EH, Ogawa H, Yamashita M. A Highly Active PBP–Iridium Catalyst for the Dehydrogenation of Dimethylamine–Borane: Catalytic Performance and Mechanism. ChemCatChem 2017. [DOI: 10.1002/cctc.201700384] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Enrique Huang Kwan
- Department of Applied Chemistry Faculty of Science and Engineering, Chuo University 1-13-27 Kasuga Bunkyo-ku 112-8551 Tokyo Japan
| | - Hayato Ogawa
- Department of Applied Chemistry Faculty of Science and Engineering, Chuo University 1-13-27 Kasuga Bunkyo-ku 112-8551 Tokyo Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku 464-8603 Nagoya Japan
- Research Development Initiative Chuo University 1-13-27 Kasuga Bunkyo-ku 112-8551 Tokyo Japan
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57
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Greño M, Mena M, Pérez-Redondo A, Yélamos C. Isolable zirconium hydride species in the reaction of amido complexes with amine-boranes. Dalton Trans 2017; 46:5138-5142. [PMID: 28327727 DOI: 10.1039/c7dt00857k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mono-, di- and trinuclear zirconium hydride species have been isolated in the treatment of amido complexes [Zr(η5-C5Me5)(NMe2)nCl3-n] (n = 3, 1) with amine-borane adducts NHR2BH3 (R2 = Me2, HtBu). The reactions involve the formation of amidoborane ligands with ZrH-B interactions which readily undergo β-hydride elimination to give hydride functions.
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Affiliation(s)
- Maider Greño
- Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28805 Alcalá de Henares-Madrid, Spain.
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58
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Marquardt C, Hegen O, Kahoun T, Scheer M. Oxidation of Substituted Phosphanylboranes with Chalcogens. Chemistry 2017; 23:4397-4404. [DOI: 10.1002/chem.201605625] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Christian Marquardt
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
| | - Oliver Hegen
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
| | - Tobias Kahoun
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
| | - Manfred Scheer
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
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59
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Titova EM, Osipova ES, Pavlov AA, Filippov OA, Safronov SV, Shubina ES, Belkova NV. Mechanism of Dimethylamine–Borane Dehydrogenation Catalyzed by an Iridium(III) PCP-Pincer Complex. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03207] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ekaterina M. Titova
- A. N. Nesmeyanov Institute of Organoelement
Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
| | - Elena S. Osipova
- A. N. Nesmeyanov Institute of Organoelement
Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
| | - Alexander A. Pavlov
- A. N. Nesmeyanov Institute of Organoelement
Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
| | - Oleg A. Filippov
- A. N. Nesmeyanov Institute of Organoelement
Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
| | - Sergey V. Safronov
- A. N. Nesmeyanov Institute of Organoelement
Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
| | - Elena S. Shubina
- A. N. Nesmeyanov Institute of Organoelement
Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
| | - Natalia V. Belkova
- A. N. Nesmeyanov Institute of Organoelement
Compounds, Russian Academy of Sciences, Vavilov str. 28, 119991 Moscow, Russia
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60
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Resendiz-Lara DA, Stubbs NE, Arz MI, Pridmore NE, Sparkes HA, Manners I. Boron–nitrogen main chain analogues of polystyrene: poly(B-aryl)aminoboranes via catalytic dehydrocoupling. Chem Commun (Camb) 2017; 53:11701-11704. [DOI: 10.1039/c7cc07331c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High molecular weight B-arylated polyaminoboranes are obtained via catalytic dehydropolymerisation of B-aryl amine–boranes and represent the first inorganic polystyrene analogues with a B–N main chain.
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Affiliation(s)
| | | | - Marius I. Arz
- School of Chemistry
- University of Bristol
- Bristol BS8 1TS
- UK
| | | | | | - Ian Manners
- School of Chemistry
- University of Bristol
- Bristol BS8 1TS
- UK
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61
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Brugos J, Cabeza JA, García-Álvarez P, Pérez-Carreño E, Van der Maelen JF. Octahedral manganese(i) and ruthenium(ii) complexes containing 2-(methylamido)pyridine–borane as a tripod κ3N,H,H-ligand. Dalton Trans 2017; 46:4009-4017. [DOI: 10.1039/c7dt00378a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The borane adduct of the 2-(methylamido)pyridine anion has been incorporated into octahedral metal (Mn, Ru) complexes and their bonding has been studied by theoretical methods (DFT, QTAIM).
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Affiliation(s)
- Javier Brugos
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Departamento de Química Orgánica e Inorgánica-IUQOEM
- Universidad de Oviedo-CSIC
- 33071 Oviedo
- Spain
| | - Javier A. Cabeza
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Departamento de Química Orgánica e Inorgánica-IUQOEM
- Universidad de Oviedo-CSIC
- 33071 Oviedo
- Spain
| | - Pablo García-Álvarez
- Centro de Innovación en Química Avanzada (ORFEO-CINQA)
- Departamento de Química Orgánica e Inorgánica-IUQOEM
- Universidad de Oviedo-CSIC
- 33071 Oviedo
- Spain
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62
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Drover MW, Bowes EG, Love JA, Schafer LL. Accessing δ-B–H Coordinated Complexes of Rh(I) and Ir(I) Using Mono- and Dihydroboranes: Cooperative Stabilization by a Phosphoramidate Coligand. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00784] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcus W. Drover
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Eric G. Bowes
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Jennifer A. Love
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Laurel L. Schafer
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
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63
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Arrowsmith M, Braunschweig H, Stennett TE. Formation and Reactivity of Electron-Precise B−B Single and Multiple Bonds. Angew Chem Int Ed Engl 2016; 56:96-115. [DOI: 10.1002/anie.201610072] [Citation(s) in RCA: 185] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Indexed: 01/25/2023]
Affiliation(s)
- Merle Arrowsmith
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
| | - Holger Braunschweig
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
| | - Tom E. Stennett
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
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64
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Synthese und Reaktivität von Verbindungen mit elektronenpräzisen B‐B‐Einfach‐ und B‐B‐Mehrfachbindungen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610072] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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65
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Characterization of B-H agostic compounds involved in the dehydrogenation of amine-boranes by group 4 metallocenes. J Mol Model 2016; 22:294. [PMID: 27888405 DOI: 10.1007/s00894-016-3165-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Accepted: 11/08/2016] [Indexed: 10/20/2022]
Abstract
For over a decade, amine-borane has been considered as a potential chemical hydrogen vector in the context of a search for cleaner energy sources. When catalyzed by organometallic complexes, the reaction mechanisms currently considered involve the formation of β-BH agostic intermediates. A thorough understanding of these intermediates may constitute a crucial step toward the identification of ideal catalysts. Topological approaches such as QTAIM and ELF revealed to be particularly suitable for the description of β-agostic interactions. When studying model catalysts, accurate theoretical calculations may be carried out. However, for a comparison with experimental data, calculations should also be carried out on large organo-metallic species, often including transition metals belonging to the second or the third row. In such a case, DFT methods are particularly attractive. Unfortunately, triple-ζ all electrons basis sets are not easily available for heavy transition metal elements. Thus, a subtle balance should be reached between the affordable level of calculations and the required accuracy of the electronic description of the systems. Herein we propose the use of B3LYP functional in combination with the LanL2DZ pseudopotential for the metal atom and 6-311++G(2d,2p) basis set for the other atoms, followed by a single point using the DKH2 relativistic Hamiltonian in combination with the B3LYP/DZP-DKH level, as a "minimum level of theory" leading to a consistent topological description of the interaction within the ELF and QTAIM framework, in the context of isolated (gas-phase) group 4 metallocene catalysts.
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66
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Müller F, Trincado M, Pribanic B, Vogt M, Grützmacher H. Stable BH3 adducts to rhodium amide bonds. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.05.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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67
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Li S, Li G, Meng W, Du H. A Frustrated Lewis Pair Catalyzed Asymmetric Transfer Hydrogenation of Imines Using Ammonia Borane. J Am Chem Soc 2016; 138:12956-12962. [DOI: 10.1021/jacs.6b07245] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Songlei Li
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Gen Li
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wei Meng
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Haifeng Du
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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68
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Metters OJ, Flynn SR, Dowds CK, Sparkes HA, Manners I, Wass DF. Catalytic Dehydrocoupling of Amine–Boranes using Cationic Zirconium(IV)–Phosphine Frustrated Lewis Pairs. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02211] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Owen J. Metters
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Stephanie R. Flynn
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Christiana K. Dowds
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Hazel A. Sparkes
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Ian Manners
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Duncan F. Wass
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
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69
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Brugos J, Cabeza JA, García-Álvarez P, Kennedy AR, Pérez-Carreño E, Van der Maelen JF. 2-(Methylamido)pyridine–Borane: A Tripod κ3-N,H,H Ligand in Trigonal Bipyramidal Rhodium(I) and Iridium(I) Complexes with an Asymmetric Coordination of Its BH3 Group. Inorg Chem 2016; 55:8905-12. [DOI: 10.1021/acs.inorgchem.6b01427] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Javier Brugos
- Departamento de Química Orgánica e Inorgánica-IUQOEM,
Centro de Innovación en Química Avanzada ORFEO-CINQA, Universidad de Oviedo-CSIC, E-33071 Oviedo, Spain
| | - Javier A. Cabeza
- Departamento de Química Orgánica e Inorgánica-IUQOEM,
Centro de Innovación en Química Avanzada ORFEO-CINQA, Universidad de Oviedo-CSIC, E-33071 Oviedo, Spain
| | - Pablo García-Álvarez
- Departamento de Química Orgánica e Inorgánica-IUQOEM,
Centro de Innovación en Química Avanzada ORFEO-CINQA, Universidad de Oviedo-CSIC, E-33071 Oviedo, Spain
| | - Alan R. Kennedy
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, U. K
| | - Enrique Pérez-Carreño
- Departamento de Química Física y Analítica, Universidad de Oviedo, E-33071 Oviedo, Spain
| | - Juan F. Van der Maelen
- Departamento de Química Física y Analítica, Universidad de Oviedo, E-33071 Oviedo, Spain
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70
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Kumar A, Beattie NA, Pike SD, Macgregor SA, Weller AS. The Simplest Amino-borane H2 B=NH2 Trapped on a Rhodium Dimer: Pre-Catalysts for Amine-Borane Dehydropolymerization. Angew Chem Int Ed Engl 2016; 55:6651-6. [PMID: 27100775 PMCID: PMC5074255 DOI: 10.1002/anie.201600898] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Revised: 03/22/2016] [Indexed: 11/17/2022]
Abstract
The μ-amino-borane complexes [Rh2 (L(R) )2 (μ-H)(μ-H2 B=NHR')][BAr(F) 4 ] (L(R) =R2 P(CH2 )3 PR2 ; R=Ph, (i) Pr; R'=H, Me) form by addition of H3 B⋅NMeR'H2 to [Rh(L(R) )(η(6) -C6 H5 F)][BAr(F) 4 ]. DFT calculations demonstrate that the amino-borane interacts with the Rh centers through strong Rh-H and Rh-B interactions. Mechanistic investigations show that these dimers can form by a boronium-mediated route, and are pre-catalysts for amine-borane dehydropolymerization, suggesting a possible role for bimetallic motifs in catalysis.
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Affiliation(s)
- Amit Kumar
- 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
| | - Sebastian D Pike
- Department of Chemistry, Chemistry Research Laboratories, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK
| | - Stuart A Macgregor
- Institute of Chemical Sciences, Heriot Watt University, Edinburgh, EH14 4AS, UK.
| | - Andrew S Weller
- Department of Chemistry, Chemistry Research Laboratories, University of Oxford, Mansfield Road, Oxford, OX1 3TA, UK.
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71
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Lorenz T, Lik A, Plamper FA, Helten H. Dehydrokupplungs- und Silazanspaltungsrouten zu organisch-anorganischen Hybridpolymeren mit NBN-Einheiten in der Hauptkette. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602342] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Thomas Lorenz
- Institut für Anorganische Chemie; RWTH Aachen; Landoltweg 1 52056 Aachen Deutschland
| | - Artur Lik
- Institut für Anorganische Chemie; RWTH Aachen; Landoltweg 1 52056 Aachen Deutschland
| | - Felix A. Plamper
- Institut für Physikalische Chemie; RWTH Aachen; Landoltweg 2 52056 Aachen Deutschland
| | - Holger Helten
- Institut für Anorganische Chemie; RWTH Aachen; Landoltweg 1 52056 Aachen Deutschland
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72
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Lorenz T, Lik A, Plamper FA, Helten H. Dehydrocoupling and Silazane Cleavage Routes to Organic-Inorganic Hybrid Polymers with NBN Units in the Main Chain. Angew Chem Int Ed Engl 2016; 55:7236-41. [PMID: 27151314 DOI: 10.1002/anie.201602342] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Indexed: 11/10/2022]
Abstract
Despite the great potential of both π-conjugated organoboron polymers and BN-doped polycyclic aromatic hydrocarbons in organic optoelectronics, our knowledge of conjugated polymers with B-N bonds in their main chain is currently scarce. Herein, the first examples of a new class of organic-inorganic hybrid polymers are presented, which consist of alternating NBN and para-phenylene units. Polycondensation with B-N bond formation provides facile access to soluble materials under mild conditions. The photophysical data for the polymer and molecular model systems of different chain lengths reveal a low extent of π-conjugation across the NBN units, which is supported by DFT calculations. The applicability of the new polymers as macromolecular polyligands is demonstrated by a cross-linking reaction with Zr(IV) .
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Affiliation(s)
- Thomas Lorenz
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
| | - Artur Lik
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
| | - Felix A Plamper
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056, Aachen, Germany
| | - Holger Helten
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany.
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73
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Stauber A, Jurca T, Marquardt C, Fleischmann M, Seidl M, Whittell GR, Manners I, Scheer M. A Convenient Route to Monoalkyl‐Substituted Phosphanylboranes (HRP–BH2–NMe3): Prospective Precursors to Poly[(alkylphosphino)boranes]. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600226] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andreas Stauber
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | - Titel Jurca
- School of ChemistryBristol UniversityCantock's CloseBS8 1TSBristolUK
| | - Christian Marquardt
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | - Martin Fleischmann
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | - Michael Seidl
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | | | - Ian Manners
- School of ChemistryBristol UniversityCantock's CloseBS8 1TSBristolUK
| | - Manfred Scheer
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
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74
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Kumar A, Beattie NA, Pike SD, Macgregor SA, Weller AS. The Simplest Amino-borane H2B=NH2Trapped on a Rhodium Dimer: Pre-Catalysts for Amine-Borane Dehydropolymerization. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600898] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Amit Kumar
- 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
| | - Sebastian D. Pike
- Department of Chemistry, Chemistry Research Laboratories; University of Oxford; Mansfield Road Oxford OX1 3TA UK
| | - Stuart A. Macgregor
- Institute of Chemical Sciences; Heriot Watt University; Edinburgh EH14 4AS UK
| | - Andrew S. Weller
- Department of Chemistry, Chemistry Research Laboratories; University of Oxford; Mansfield Road Oxford OX1 3TA UK
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75
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Rossin A, Peruzzini M. Ammonia–Borane and Amine–Borane Dehydrogenation Mediated by Complex Metal Hydrides. Chem Rev 2016; 116:8848-72. [DOI: 10.1021/acs.chemrev.6b00043] [Citation(s) in RCA: 305] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andrea Rossin
- Institute of Chemistry of
Organometallic Compounds, ICCOM-CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
| | - Maurizio Peruzzini
- Institute of Chemistry of
Organometallic Compounds, ICCOM-CNR, Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy
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76
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Drover MW, Bowes EG, Schafer LL, Love JA, Weller AS. Phosphoramidate-Supported Cp*IrIII
Aminoborane H2
B=NR2
Complexes: Synthesis, Structure, and Solution Dynamics. Chemistry 2016; 22:6793-7. [DOI: 10.1002/chem.201600951] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Marcus W. Drover
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Eric G. Bowes
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Laurel L. Schafer
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Jennifer A. Love
- Department of Chemistry; The University of British Columbia; Vancouver BC V6T 1Z1 Canada
| | - Andrew S. Weller
- Department of Chemistry; The University of Oxford; Chemistry Research Laboratories; Oxford OX1 3TA UK
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77
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Kumar A, Ishibashi JSA, Hooper TN, Mikulas TC, Dixon DA, Liu SY, Weller AS. The Synthesis, Characterization and Dehydrogenation of Sigma-Complexes of BN-Cyclohexanes. Chemistry 2016; 22:310-22. [PMID: 26602704 PMCID: PMC4818983 DOI: 10.1002/chem.201502986] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 11/11/2022]
Abstract
The coordination chemistry of the 1,2-BN-cyclohexanes 2,2-R2 -1,2-B,N-C4 H10 (R2 =HH, MeH, Me2 ) with Ir and Rh metal fragments has been studied. This led to the solution (NMR spectroscopy) and solid-state (X-ray diffraction) characterization of [Ir(PCy3 )2 (H)2 (η(2) η(2) -H2 BNR2 C4 H8 )][BAr(F) 4 ] (NR2 =NH2 , NMeH) and [Rh(iPr2 PCH2 CH2 CH2 PiPr2 )(η(2) η(2) -H2 BNR2 C4 H8 )][BAr(F) 4 ] (NR2 =NH2 , NMeH, NMe2 ). For NR2 =NH2 subsequent metal-promoted, dehydrocoupling shows the eventual formation of the cyclic tricyclic borazine [BNC4 H8 ]3 , via amino-borane and, tentatively characterized using DFT/GIAO chemical shift calculations, cycloborazane intermediates. For NR2 =NMeH the final product is the cyclic amino-borane HBNMeC4 H8 . The mechanism of dehydrogenation of 2,2-H,Me-1,2-B,N-C4 H10 using the {Rh(iPr2 PCH2 CH2 CH2 PiPr2 )}(+) catalyst has been probed. Catalytic experiments indicate the rapid formation of a dimeric species, [Rh2 (iPr2 PCH2 CH2 CH2 PiPr2 )2 H5 ][BAr(F) 4 ]. Using the initial rate method starting from this dimer, a first-order relationship to [amine-borane], but half-order to [Rh] is established, which is suggested to be due to a rapid dimer-monomer equilibrium operating.
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Affiliation(s)
- Amit Kumar
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA (UK)
| | - Jacob S A Ishibashi
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860 (USA)
| | - Thomas N Hooper
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA (UK)
| | - Tanya C Mikulas
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336 (USA)
| | - David A Dixon
- Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487-0336 (USA)
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860 (USA).
| | - Andrew S Weller
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA (UK).
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78
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Ramachandran PV, Kulkarni AS. The role of ammonia in promoting ammonia borane synthesis. Dalton Trans 2016; 45:16433-16440. [PMID: 27711866 DOI: 10.1039/c6dt02925f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mechanistic studies point toward added ammonia acting as a reagent while promoting the high-yielding synthesis of pure ammonia borane from sodium borohydride and ammonium salts.
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Affiliation(s)
| | - Ameya S. Kulkarni
- Herbert C. Brown Center for Borane Research
- Department of Chemistry
- Purdue University
- West Lafayette
- USA
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79
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Fernández-Millán M, Allen LK, García-Rodríguez R, Bond AD, Mosquera MEG, Wright DS. Formation of a unique ‘unsupported’ hydridic stannate(ii). Chem Commun (Camb) 2016; 52:5993-6. [DOI: 10.1039/c6cc01885h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The reaction of the amido-stannate LiSn(NMe2)3 with the phosphine–borane tBu2PHBH3 gives the SnII hydride [(Me2NH)2Li{BH3P(tBu)2}2Sn(H)] (1); the first example of a hydridic stannate(ii) that is not supported by transition metal or ligand bonding.
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Affiliation(s)
| | - Lucy K. Allen
- Chemistry Department
- Cambridge University
- Cambridge CB2 1EW
- UK
| | | | - Andrew D. Bond
- Chemistry Department
- Cambridge University
- Cambridge CB2 1EW
- UK
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80
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Stennett TE, Harder S. s-Block amidoboranes: syntheses, structures, reactivity and applications. Chem Soc Rev 2016; 45:1112-28. [DOI: 10.1039/c5cs00544b] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The highly versatile amidoborane compounds of the group 1 and 2 metals are reviewed, with an emphasis on their synthesis, structures and reactivity.
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Affiliation(s)
- Tom E. Stennett
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Inorganic and Organometallic Chemistry
- 91058 Erlangen
- Germany
| | - Sjoerd Harder
- Friedrich-Alexander-Universität Erlangen-Nürnberg
- Inorganic and Organometallic Chemistry
- 91058 Erlangen
- Germany
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81
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Lunsford AM, Blank JH, Moncho S, Haas SC, Muhammad S, Brothers EN, Darensbourg MY, Bengali AA. Catalysis and Mechanism of H2 Release from Amine-Boranes by Diiron Complexes. Inorg Chem 2015; 55:964-73. [DOI: 10.1021/acs.inorgchem.5b02601] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Allen M. Lunsford
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Jan H. Blank
- Department of Chemistry, Texas A&M University at Qatar, Doha, Qatar
| | - Salvador Moncho
- Department of Chemistry, Texas A&M University at Qatar, Doha, Qatar
| | - Steven C. Haas
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Sohail Muhammad
- Department of Chemistry, Texas A&M University at Qatar, Doha, Qatar
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82
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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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83
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Marquardt C, Jurca T, Schwan KC, Stauber A, Virovets AV, Whittell GR, Manners I, Scheer M. Metal-Free Addition/Head-to-Tail Polymerization of Transient Phosphinoboranes, RPH-BH2: A Route to Poly(alkylphosphinoboranes). Angew Chem Int Ed Engl 2015; 54:13782-6. [PMID: 26427911 PMCID: PMC4648028 DOI: 10.1002/anie.201507084] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 11/12/2022]
Abstract
Mild thermolysis of Lewis base stabilized phosphinoborane monomers R(1)R(2)P-BH2⋅NMe3 (R(1),R(2)=H, Ph, or tBu/H) at room temperature to 100 °C provides a convenient new route to oligo- and polyphosphinoboranes [R(1)R(2)P-BH2]n. The polymerization appears to proceed via the addition/head-to-tail polymerization of short-lived free phosphinoborane monomers, R(1)R(2)P-BH2. This method offers access to high molar mass materials, as exemplified by poly(tert-butylphosphinoborane), that are currently inaccessible using other routes (e.g. catalytic dehydrocoupling).
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Affiliation(s)
- Christian Marquardt
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - Titel Jurca
- School of Chemistry, Bristol UniversityCantock's Close, BS8 1TS, Bristol (UK) E-mail:
| | - Karl-Christian Schwan
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - Andreas Stauber
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - Alexander V Virovets
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - George R Whittell
- School of Chemistry, Bristol UniversityCantock's Close, BS8 1TS, Bristol (UK) E-mail:
| | - Ian Manners
- School of Chemistry, Bristol UniversityCantock's Close, BS8 1TS, Bristol (UK) E-mail:
| | - Manfred Scheer
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
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84
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Stubbs NE, Schäfer A, Robertson APM, Leitao EM, Jurca T, Sparkes HA, Woodall CH, Haddow MF, Manners I. B-Methylated Amine-Boranes: Substituent Redistribution, Catalytic Dehydrogenation, and Facile Metal-Free Hydrogen Transfer Reactions. Inorg Chem 2015; 54:10878-89. [DOI: 10.1021/acs.inorgchem.5b01946] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Naomi E. Stubbs
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | - André Schäfer
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | | | - Erin M. Leitao
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | - Titel Jurca
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | - Hazel A. Sparkes
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | | | - Mairi F. Haddow
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | - Ian Manners
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
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85
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Marquardt C, Jurca T, Schwan KC, Stauber A, Virovets AV, Whittell GR, Manners I, Scheer M. Metallfreie Additions-/Kopf-Schwanz-Polymerisation von intermediär gebildeten Phosphanylboranen, RPH-BH2: ein Weg zu Poly(alkylphosphanylboranen). Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507084] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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86
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Bellham P, Hill MS, Kociok-Köhn G. Alkali metal-mediated dehydrocoupling of Me2NH·BH3. Dalton Trans 2015; 44:12078-81. [PMID: 25789721 DOI: 10.1039/c5dt00178a] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bis(trimethylsilyl)amide derivatives of the group 1 elements (Li, Na, K) are competent pre-catalysts for the dehydrocoupling of Me2NH·BH3 via the formation of intermediates containing [H3BNMe2BH2Me2N](-) anions.
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Affiliation(s)
- Peter Bellham
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
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87
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Johnson HC, Weller AS. P-C-Activated Bimetallic Rhodium Xantphos Complexes: Formation and Catalytic Dehydrocoupling of Amine-Boranes. Angew Chem Int Ed Engl 2015; 54:10173-7. [PMID: 26140498 PMCID: PMC4557049 DOI: 10.1002/anie.201504073] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Indexed: 11/12/2022]
Abstract
{Rh(xantphos)}-based phosphido dimers form by P-C activation of xantphos (4,5-bis(diphenylphosphino)-9,9-dimethylxanthene) in the presence of amine-boranes. These dimers are active dehydrocoupling catalysts, forming polymeric [H2 BNMeH]n from H3 B⋅NMeH2 and dimeric [H2 BNMe2 ]2 from H3 B⋅NMe2 H at low catalyst loadings (0.1 mol %). Mechanistic investigations support a dimeric active species, suggesting that bimetallic catalysis may be possible in amine-borane dehydropolymerization.
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Affiliation(s)
- Heather C Johnson
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA (UK)
| | - Andrew S Weller
- Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA (UK).
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88
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Stevenson LC, Mellino S, Clot E, Mountford P. Reactions of Titanium Hydrazides with Silanes and Boranes: N-N Bond Cleavage and N Atom Functionalization. J Am Chem Soc 2015; 137:10140-3. [PMID: 26226513 DOI: 10.1021/jacs.5b06627] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Reaction of Ti(N2(iPr)N)(NNPh2)(py) with Ph(R)SiH2 (R = H, Ph) or 9-BBN gave reductive cleavage of the N(α)-N(β) bond and formation of new silyl- or boryl-amido ligands. The corresponding reactions of Cp*Ti{MeC(N(i)Pr)2}(NNR2) (R = Me or Ph) with HBPin or 9-BBN gave borylhydrazido-hydride or borylimido products, respectively. N(α) and N(β) atom transfer and dehydrogenative coupling reactions are also reported.
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Affiliation(s)
- Laura C Stevenson
- †Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Simona Mellino
- †Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Eric Clot
- ‡Institut Charles Gerhardt Montpellier, CNRS 5253, Université Montpellier, cc 1501, Place Eugène Bataillon, F-34095 Montpellier Cedex 5, France
| | - Philip Mountford
- †Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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89
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90
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PC-Activated Bimetallic Rhodium Xantphos Complexes: Formation and Catalytic Dehydrocoupling of Amine-Boranes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504073] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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91
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Leitao EM, Manners I. Rehydrogenation of Aminoboranes to Amine-Boranes Using H2O: Reaction Scope and Mechanism. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500117] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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92
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Schäfer A, Jurca T, Turner J, Vance JR, Lee K, Du VA, Haddow MF, Whittell GR, Manners I. Iron-Catalyzed Dehydropolymerization: A Convenient Route to Poly(phosphinoboranes) with Molecular-Weight Control. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411957] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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93
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Schäfer A, Jurca T, Turner J, Vance JR, Lee K, Du VA, Haddow MF, Whittell GR, Manners I. Iron-catalyzed dehydropolymerization: a convenient route to poly(phosphinoboranes) with molecular-weight control. Angew Chem Int Ed Engl 2015; 54:4836-41. [PMID: 25712707 DOI: 10.1002/anie.201411957] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 01/29/2015] [Indexed: 01/21/2023]
Abstract
The catalyst loading is the key to control the molecular weight of the polymer in the iron-catalyzed dehydropolymerization of phosphine-borane adducts. Studies showed that the reaction proceeds through a chain-growth coordination-insertion mechanism.
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Affiliation(s)
- André Schäfer
- School of Chemistry, Bristol University, Cantock's Close, BS8 1TS, Bristol (UK); Current adress: Saarland University, Department 8.1-Chemistry, 66123 Saarbrücken (Germany)
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