1
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Jurt P, Gamboa-Carballo JJ, Schweinzer C, Himmelbauer D, Thöny D, Gianetti TL, Trincado M, Grützmacher H. Selective dehydrogenation of ammonia borane to borazine and derivatives by rhodium olefin complexes. Dalton Trans 2024. [PMID: 39140315 DOI: 10.1039/d4dt01520g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2024]
Abstract
This report presents a selective synthetic approach towards borazine from ammonia borane using a dinuclear rhodium olefin homogeneous catalyst. The synthesis and spectroscopic characterization of a dirhodium ammonia borane complex as an intermediate provides insight into a possible mode of activation.
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Affiliation(s)
- Pascal Jurt
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, CH-8049 Zurich, Switzerland.
| | - Juan José Gamboa-Carballo
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, CH-8049 Zurich, Switzerland.
- Higher Institute of Technologies and Applied Sciences (InSTEC), University of Havana, Ave. S. Allende 1110, 10600 Havana, Cuba
| | - Clara Schweinzer
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, CH-8049 Zurich, Switzerland.
| | - Daniel Himmelbauer
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163, A-1060 Vienna, Austria
| | - Debora Thöny
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, CH-8049 Zurich, Switzerland.
| | - Thomas L Gianetti
- Department of Chemistry and Biochemistry, University of Arizona, University Blvd., Tucson, AZ 85719, USA.
| | - Monica Trincado
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, CH-8049 Zurich, Switzerland.
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
| | - Hansjörg Grützmacher
- Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, CH-8049 Zurich, Switzerland.
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2
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Tseng YT, Pelmenschikov V, Iffland-Mühlhaus L, Calabrese D, Chang YC, Laun K, Pao CW, Sergueev I, Yoda Y, Liaw WF, Chen CH, Hsu IJ, Apfel UP, Caserta G, Lauterbach L, Lu TT. Substrate-Gated Transformation of a Pre-Catalyst into an Iron-Hydride Intermediate [(NO) 2(CO)Fe(μ-H)Fe(CO)(NO) 2] - for Catalytic Dehydrogenation of Dimethylamine Borane. Inorg Chem 2023; 62:769-781. [PMID: 36580657 DOI: 10.1021/acs.inorgchem.2c03278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Continued efforts are made on the development of earth-abundant metal catalysts for dehydrogenation/hydrolysis of amine boranes. In this study, complex [K-18-crown-6-ether][(NO)2Fe(μ-MePyr)(μ-CO)Fe(NO)2] (3-K-crown, MePyr = 3-methylpyrazolate) was explored as a pre-catalyst for the dehydrogenation of dimethylamine borane (DMAB). Upon evolution of H2(g) from DMAB triggered by 3-K-crown, parallel conversion of 3-K-crown into [(NO)2Fe(N,N'-MePyrBH2NMe2)]- (5) and an iron-hydride intermediate [(NO)2(CO)Fe(μ-H)Fe(CO)(NO)2]- (A) was evidenced by X-ray diffraction/nuclear magnetic resonance/infrared/nuclear resonance vibrational spectroscopy experiments and supported by density functional theory calculations. Subsequent transformation of A into complex [(NO)2Fe(μ-CO)2Fe(NO)2]- (6) is synchronized with the deactivated generation of H2(g). Through reaction of complex [Na-18-crown-6-ether][(NO)2Fe(η2-BH4)] (4-Na-crown) with CO(g) as an alternative synthetic route, isolated intermediate [Na-18-crown-6-ether][(NO)2(CO)Fe(μ-H)Fe(CO)(NO)2] (A-Na-crown) featuring catalytic reactivity toward dehydrogenation of DMAB supports a substrate-gated transformation of a pre-catalyst [(NO)2Fe(μ-MePyr)(μ-CO)Fe(NO)2]- (3) into the iron-hydride species A as an intermediate during the generation of H2(g).
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Affiliation(s)
- Yu-Ting Tseng
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan.,Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | | | - Linda Iffland-Mühlhaus
- Department of Chemistry and Biochemistry, Inorganic Chemistry Ι, Ruhr-Universität Bochum, Bochum 44801, Germany
| | - Donato Calabrese
- Institute of Applied Microbiology, RWTH Aachen University, Aachen 52074, Germany
| | - Yu-Che Chang
- Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Konstantin Laun
- Institut für Chemie, Technische Universität Berlin, Berlin 10623, Germany
| | - Chih-Wen Pao
- National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan
| | - Ilya Sergueev
- Deutsches Elektronen-Synchrotron DESY, Hamburg D-22607, Germany
| | | | - Wen-Feng Liaw
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chien-Hong Chen
- Department of Medical Applied Chemistry, Chung Shan Medical University and Department of Medical Education, Chung Shan Medical University Hospital, Taichung 40201, Taiwan
| | - I-Jui Hsu
- Department of Molecular Science and Engineering, Research and Development Center of Smart Textile Technology, National Taipei University of Technology, Taipei 10608, Taiwan
| | - Ulf-Peter Apfel
- Department of Chemistry and Biochemistry, Inorganic Chemistry Ι, Ruhr-Universität Bochum, Bochum 44801, Germany.,Department for Electrosynthesis, Fraunhofer UMSICHT, Oberhausen 46047, Germany
| | - Giorgio Caserta
- Institut für Chemie, Technische Universität Berlin, Berlin 10623, Germany
| | - Lars Lauterbach
- Institute of Applied Microbiology, RWTH Aachen University, Aachen 52074, Germany
| | - Tsai-Te Lu
- Department of Chemistry, National Tsing Hua University, Hsinchu 30013, Taiwan.,Institute of Biomedical Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
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3
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Saha S, Haridas A, Assanar F, Bansal C, Sudhadevi Antharjanam PK, Ghosh S. Cooperative B-H activation by Cp* based κ 2- N, S-chelated Ru(II) and Mo(II) complexes (Cp* = η 5-C 5Me 5). Dalton Trans 2022; 51:4806-4813. [PMID: 35254378 DOI: 10.1039/d2dt00242f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The chemistry of the Cp* based κ2-N,S-chelated ruthenium complex, [Cp*RuPPh3(κ2-N,S-(NC7H4S2)], 1 with different boranes has been explored. The room temperature reaction of 1 with BH3·THF and bulky boranes, such as MesBH2 and H2BArF, led to the formation of different dihydridoborate complexes, [{κ3-S,H,H-(NBH2R)(S2H4C7)}RuCp*], 2-4 (2: R = H, 3: R = Mes, and 4: R = ArF; Mes = 2,4,6-trimethylphenyl, and ArF = 3,5-bistrifluoromethyl-benzene). In contrast, the Cp* based κ2-N,S-chelated molybdenum complex, [Cp*Mo(CO)2{κ2-N,S-(NC7H4S2)}], 5, yielded the agostic borate species, [Cp*Mo(CO)2{κ2-S,H-(NBH2R) (NC7H4S2)}], 6 and 7 (6: R = Mes and 7: R = ArF) at elevated temperatures.
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Affiliation(s)
- Suvam Saha
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Anagha Haridas
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Faneesha Assanar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Charu Bansal
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | | | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
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4
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Joseph B, Gomosta S, Prakash R, Roisnel T, Phukan AK, Ghosh S. Chalcogen Stabilized bis‐Hydridoborate Complexes of Cobalt: Analogues of Tetracyclo[4.3.0.0
2,4
.0
3,5
]nonane. Chemistry 2020; 26:16824-16832. [DOI: 10.1002/chem.202003152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Indexed: 11/05/2022]
Affiliation(s)
- Benson Joseph
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Suman Gomosta
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Rini Prakash
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
| | - Thierry Roisnel
- Institut des Sciences Chimiques de Rennes Université de Rennes, CNRS UMR 6226 35000 Rennes France
| | - Ashwini K. Phukan
- Department of Chemical Sciences Tezpur University Napaam 784028 Assam India
| | - Sundargopal Ghosh
- Department of Chemistry Indian Institute of Technology Madras Chennai 600036 India
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5
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Abstract
Our planet urgently needs sustainable solutions to alleviate the anthropogenic global warming and climate change. Homogeneous catalysis has the potential to play a fundamental role in this process, providing novel, efficient, and at the same time eco-friendly routes for both chemicals and energy production. In particular, pincer-type ligation shows promising properties in terms of long-term stability and selectivity, as well as allowing for mild reaction conditions and low catalyst loading. Indeed, pincer complexes have been applied to a plethora of sustainable chemical processes, such as hydrogen release, CO2 capture and conversion, N2 fixation, and biomass valorization for the synthesis of high-value chemicals and fuels. In this work, we show the main advances of the last five years in the use of pincer transition metal complexes in key catalytic processes aiming for a more sustainable chemical and energy production.
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6
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Shiekh BA. Hierarchy of Commonly Used DFT Methods for Predicting the Thermochemistry of Rh-Mediated Chemical Transformations. ACS OMEGA 2019; 4:15435-15443. [PMID: 31572844 PMCID: PMC6761679 DOI: 10.1021/acsomega.9b01563] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 09/04/2019] [Indexed: 06/10/2023]
Abstract
The accuracy and reliability of 17 commonly used density functionals in conjunction with Poisson-Boltzmann finite solvation model were gauged for predicting the free energy of Rh(I)- and Rh(III)-mediated chemical transformations such as ligand exchange, hydride elimination, dihydrogen elimination, chloride affinity, and silyl hydride bond activation reactions. In total, six Rh-mediated reactions were examined, and the computed density functional theory results were then subjected to comparison with the experimentally reported values. For reaction A, involving replacement of N2 with η2-H2 over Rh(I), MPWB1K-D3, B3PW91, B3LYP, and BHandHYLP emerged to be the best functionals of all the tested methods in terms of their deviations ≤2 kcal mol-1 from experimental data. For reaction B, in which exchange of η2-C2H4 with N2 over Rh(I) takes place, MPWB1K-D3 and M06-2X-D3 functionals performed the best, while as for reaction C (hydride elimination reaction in Rh(III) complex), it is PBE functional that showed impressive performance. Similarly, for reaction D (H2 elimination reaction in Rh(III) complex), PBE0-D3 and PBE-D3 showed exceptional results compared to other functionals. For reaction E (H2O/Cl- exchange), the PBE0 again shows impressive performance as compared to other functionals. For reaction F (Si-H activation), M06-2X-D3, PBE0-D3, and MPWB1K-D3 functionals are undoubtedly the best functionals. Overall, PBE0-D3 and MPWB1K-D3 functionals were impressive in all cases with lowest mean unsigned errors (3.2 and 3.4 kcal mol-1, respectively) with respect to experimental Gibbs free energies. Thus, these two functionals are recommended for studying Rh-mediated chemical transformations.
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7
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Gorgas N, Stöger B, Veiros LF, Kirchner K. Access to Fe
II
Bis(σ‐B−H) Aminoborane Complexes through Protonation of a Borohydride Complex and Dehydrogenation of Amine‐Boranes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Nikolaus Gorgas
- Institute of Applied Synthetic ChemistryVienna University of Technology Getreidemarkt 9/163-AC 1060 Wien Austria
| | - Berthold Stöger
- X-Ray CenterVienna University of Technology Getreidemarkt 9 A-1060 Wien Austria
| | - Luis F. Veiros
- Centro de Química EstruturalInstituto Superior TécnicoUniversidade de Lisboa Av. Rovisco Pais No. 1 1049-001 Lisboa Portugal
| | - Karl Kirchner
- Institute of Applied Synthetic ChemistryVienna University of Technology Getreidemarkt 9/163-AC 1060 Wien Austria
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8
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Gorgas N, Stöger B, Veiros LF, Kirchner K. Access to Fe
II
Bis(σ‐B−H) Aminoborane Complexes through Protonation of a Borohydride Complex and Dehydrogenation of Amine‐Boranes. Angew Chem Int Ed Engl 2019; 58:13874-13879. [DOI: 10.1002/anie.201906971] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Revised: 06/30/2019] [Indexed: 11/07/2022]
Affiliation(s)
- Nikolaus Gorgas
- Institute of Applied Synthetic ChemistryVienna University of Technology Getreidemarkt 9/163-AC 1060 Wien Austria
| | - Berthold Stöger
- X-Ray CenterVienna University of Technology Getreidemarkt 9 A-1060 Wien Austria
| | - Luis F. Veiros
- Centro de Química EstruturalInstituto Superior TécnicoUniversidade de Lisboa Av. Rovisco Pais No. 1 1049-001 Lisboa Portugal
| | - Karl Kirchner
- Institute of Applied Synthetic ChemistryVienna University of Technology Getreidemarkt 9/163-AC 1060 Wien Austria
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9
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Lenczyk C, Roy DK, Ghosh B, Schwarzmann J, Phukan AK, Braunschweig H. First Bis(σ)‐borane Complexes of Group 6 Transition Metals: Experimental and Theoretical Studies. Chemistry 2019; 25:8585-8589. [DOI: 10.1002/chem.201901075] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Carsten Lenczyk
- Institute for Inorganic ChemistryInstitute for Sustainable Chemistry, & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Dipak Kumar Roy
- Institute for Inorganic ChemistryInstitute for Sustainable Chemistry, & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Bijoy Ghosh
- Department of Chemical SciencesTezpur University Napaam 784028 India
| | - Johannes Schwarzmann
- Institute for Inorganic ChemistryInstitute for Sustainable Chemistry, & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Ashwini K. Phukan
- Department of Chemical SciencesTezpur University Napaam 784028 India
| | - Holger Braunschweig
- Institute for Inorganic ChemistryInstitute for Sustainable Chemistry, & Catalysis with BoronJulius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
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10
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Burkhardt L, Mueller C, Groß OA, Sun Y, Sitzmann H, Bauer M. The Bonding Situation in the Dinuclear Tetra-Hydrido Complex [{ 5CpFe} 2(μ-H) 4] Revisited by Hard X-Ray Spectroscopy. Inorg Chem 2019; 58:6609-6618. [PMID: 30596494 DOI: 10.1021/acs.inorgchem.8b03032] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
High energy resolution fluorescence detected XANES (HERFD-XANES) and valence-to-core X-ray emission spectroscopy (VtC-XES) are introduced as powerful tools to investigate hydride-iron interaction, the possible iron-iron bond, and iron spin state of the dinuclear tetra-hydrido complex [{5CpFe}2(μ-H)4] (1H, 5Cp = η5-C5 iPr5) by thoroughly accessing the geometric and electronic structure of this complex in comparison to the nonhydride reference [5CpCpFe] (1, Cp = C5H5). The so far observed most intense hydride induced signals in the pre-edge feature of the HERFD-XANES and in the VtC-XES spectra at the iron K-edge allow a precise analysis of the LUMO and HOMO states, respectively, by application of time-dependent density function theory (TD-DFT) and density functional theory (DFT) calculations. The results of these calculations are further employed to understand the oxidation state, spin states, and potential Fe-Fe bonds in this complex.
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Affiliation(s)
- Lukas Burkhardt
- Faculty of Science , Paderborn University , Warburger Straße 100 , 33098 Paderborn , Germany
| | - Carsten Mueller
- Department of Chemistry , University of Kaiserslautern , Erwin-Schrödinger-Straße 54 , 67663 Kaiserslautern , Germany
| | - Oliver A Groß
- Faculty of Science , Paderborn University , Warburger Straße 100 , 33098 Paderborn , Germany
| | - Yu Sun
- Department of Chemistry , University of Kaiserslautern , Erwin-Schrödinger-Straße 54 , 67663 Kaiserslautern , Germany
| | - Helmut Sitzmann
- Department of Chemistry , University of Kaiserslautern , Erwin-Schrödinger-Straße 54 , 67663 Kaiserslautern , Germany
| | - Matthias Bauer
- Faculty of Science , Paderborn University , Warburger Straße 100 , 33098 Paderborn , Germany.,Center for Sustainable Systems Design (CSSD) , Paderborn University , Warburger Straße 100 , 33098 Paderborn , Germany
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11
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Adams GM, Ryan DE, Beattie NA, McKay AI, Lloyd-Jones GC, Weller AS. Dehydropolymerization of H 3B·NMeH 2 Using a [Rh(DPEphos)] + Catalyst: The Promoting Effect of NMeH 2. ACS Catal 2019; 9:3657-3666. [PMID: 30984472 PMCID: PMC6454579 DOI: 10.1021/acscatal.9b00081] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2019] [Revised: 03/02/2019] [Indexed: 01/01/2023]
Abstract
![]()
[Rh(κ2-PP-DPEphos){η2η2-H2B(NMe3)(CH2)2tBu}][BArF4]
acts as an effective precatalyst
for the dehydropolymerization of H3B·NMeH2 to form N-methylpolyaminoborane (H2BNMeH)n. Control of polymer molecular weight is
achieved by variation of precatalyst loading (0.1–1 mol %,
an inverse relationship) and use of the chain-modifying agent H2: with Mn ranging between 5 500
and 34 900 g/mol and Đ between 1.5 and
1.8. H2 evolution studies (1,2-F2C6H4 solvent) reveal an induction period that gets longer
with higher precatalyst loading and complex kinetics with a noninteger
order in [Rh]TOTAL. Speciation studies at 10 mol % indicate
the initial formation of the amino–borane bridged dimer, [Rh2(κ2-PP-DPEphos)2(μ-H)(μ-H2BN=HMe)][BArF4], followed by the crystallographically
characterized amidodiboryl complex [Rh2(cis-κ2-PP-DPEphos)2(σ,μ-(H2B)2NHMe)][BArF4]. Adding
∼2 equiv of NMeH2 in tetrahydrofuran (THF) solution
to the precatalyst removes this induction period, pseudo-first-order
kinetics are observed, a half-order relationship to [Rh]TOTAL is revealed with regard to dehydrogenation, and polymer molecular
weights are increased (e.g., Mn = 40 000
g/mol). Speciation studies suggest that NMeH2 acts to form
the precatalysts [Rh(κ2-DPEphos)(NMeH2)2][BArF4] and [Rh(κ2-DPEphos)(H)2(NMeH2)2][BArF4], which were independently synthesized and shown to
follow very similar dehydrogenation kinetics, and produce polymers
of molecular weight comparable with [Rh(κ2-PP-DPEphos){η2-H2B(NMe3)(CH2)2tBu}][BArF4], which has been doped
with amine. This promoting effect of added amine in situ is shown
to be general in other cationic Rh-based systems, and possible mechanistic
scenarios are discussed.
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Affiliation(s)
- Gemma M. Adams
- Chemistry Research Laboratories, Mansfield Road, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - David E. Ryan
- Chemistry Research Laboratories, Mansfield Road, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Nicholas A. Beattie
- Institute of Chemical Sciences, Heriot Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Alasdair I. McKay
- Chemistry Research Laboratories, Mansfield Road, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Guy C. Lloyd-Jones
- School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, United Kingdom
| | - Andrew S. Weller
- Chemistry Research Laboratories, Mansfield Road, University of Oxford, Oxford OX1 3TA, United Kingdom
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12
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Swamy VSVSN, Raj KV, Vanka K, Sen SS, Roesky HW. Silylene induced cooperative B–H bond activation and unprecedented aldehyde C–H bond splitting with amidinate ring expansion. Chem Commun (Camb) 2019; 55:3536-3539. [DOI: 10.1039/c9cc00296k] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Silylene mediated B–H and aldehyde C–H bond splitting were realized under ambient conditions.
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Affiliation(s)
- V. S. V. S. N. Swamy
- Inorganic Chemistry and Catalysis Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - K. Vipin Raj
- Academy of Scientific and Innovative Research (AcSIR)
- Ghaziabad-201002
- India
- Physical and Material Chemistry Division
- CSIR-National Chemical Laboratory
| | - Kumar Vanka
- Academy of Scientific and Innovative Research (AcSIR)
- Ghaziabad-201002
- India
- Physical and Material Chemistry Division
- CSIR-National Chemical Laboratory
| | - Sakya S. Sen
- Inorganic Chemistry and Catalysis Division
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Herbert W. Roesky
- Institute of Inorganic Chemistry
- Georg-August University
- Göttingen
- Germany
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13
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Trose M, Reiß M, Reiß F, Anke F, Spannenberg A, Boye S, Lederer A, Arndt P, Beweries T. Dehydropolymerisation of methylamine borane using a dinuclear 1,3-allenediyl bridged zirconocene complex. Dalton Trans 2018; 47:12858-12862. [PMID: 30156242 DOI: 10.1039/c8dt03311k] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dinuclear zirconocene chloride complex 1 is a highly active precatalyst for the dehydropolymerisation of methylamine borane. Comparison with mononuclear Zr chlorides and related dinuclear complexes suggests that the nature of the bridging motif is essential for the unique reactivity of 1.
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Affiliation(s)
- M Trose
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.
| | - M Reiß
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.
| | - F Reiß
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.
| | - F Anke
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.
| | - A Spannenberg
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.
| | - S Boye
- Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, 01069 Dresden, Germany
| | - A Lederer
- Leibniz-Institut für Polymerforschung Dresden, Hohe Str. 6, 01069 Dresden, Germany and Technische Universität Dresden, 01062 Dresden, Germany
| | - P Arndt
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.
| | - T Beweries
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, Albert-Einstein-Str. 29a, 18059 Rostock, Germany.
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14
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Turner J, Chilton NF, Kumar A, Colebatch AL, Whittell GR, Sparkes HA, Weller AS, Manners I. Iron Precatalysts with Bulky Tri(tert-butyl)cyclopentadienyl Ligands for the Dehydrocoupling of Dimethylamine-Borane. Chemistry 2018; 24:14127-14136. [PMID: 29573487 DOI: 10.1002/chem.201705316] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 03/07/2018] [Indexed: 11/11/2022]
Abstract
In an attempt to prepare new Fe catalysts for the dehydrocoupling of amine-boranes and to provide mechanistic insight, the paramagnetic FeII dimeric complex [Cp'FeI]2 (1) (Cp'=η5 -((1,2,4-tBu)3 C5 H2 )) was used as a precursor to a series of cyclopentadienyl FeII and FeIII mononuclear species. The complexes prepared were [Cp'Fe(η6 -Tol)][Cp'FeI2 ] (2) (Tol=C6 H5 Me), [Cp'Fe(η6 -Tol)][BArF4 ] (3) (BArF4 =[B(C6 H3 (m-CF3 )2 )4 ]- ), [N(nBu)4 ][Cp'FeI2 ] (4), Cp'FeI2 (5), and [Cp'Fe(MeCN)3 ][BArF4 ] (6). The electronic structure of the [Cp'FeI2 ]- anion in 2 and 4 was investigated by SQUID magnetometry, EPR spectroscopy and ab initio Complete Active Space Self Consistent Field-Spin Orbit (CASSCF-SO) calculations, and the studies revealed a strongly anisotropic S=2 ground state. Complexes 1-6 were investigated as catalysts for the dehydrocoupling of Me2 NH⋅BH3 (I) in THF at 20 °C to yield the cyclodiborazane product [Me2 N-BH2 ]2 (IV). Complexes 1-4 and 6 were active dehydrocoupling catalysts towards I (5 mol % loading), however 5 was inactive, and ultra-violet (UV) irradiation was required for the reaction mediated by 3. Complex 6 was found to be the most active precatalyst, reaching 80 % conversion to IV after 19 h at 22 °C. Dehydrocoupling of I by 1-4 proceeded via formation of the aminoborane Me2 N=BH2 (II) as the major intermediate, whereas for 6 the linear diborazane Me2 NH-BH2 -NMe2 -BH3 (III) could be detected, together with trace amounts of II. Reactions of 1 and 6 with Me3 N⋅BH3 were investigated in an attempt to identify Fe-based intermediates in the catalytic reactions. The σ-complex [Cp'Fe(MeCN)(κ2 -H2 BH⋅NMe2 H][BArF4 ] was proposed to initially form in dehydrocoupling reactions involving 6 based on ESI-MS (ESI=Electrospray Ionisation Mass Spectroscopy) and NMR spectroscopic evidence. The latter also suggests that these complexes function as precursors to iron hydrides which may be the true catalytic species.
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Affiliation(s)
- Joshua Turner
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Nicholas F Chilton
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Amit Kumar
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | | | - George R Whittell
- 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
| | - Andrew S Weller
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Ian Manners
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
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15
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Vondung L, Alig L, Ballmann M, Langer R. Umpolung at Boron: Ancillary-Ligand-Induced Formation of Boron-Based Donor Ligands from Phosphine-Boranes. Chemistry 2018; 24:12346-12353. [DOI: 10.1002/chem.201705847] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Lisa Vondung
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
| | - Lukas Alig
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
| | - Monika Ballmann
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
| | - Robert Langer
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
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16
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Pal S, Kusumoto S, Nozaki K. Dehydrogenation of Dimethylamine–Borane Catalyzed by Half-Sandwich Ir and Rh Complexes: Mechanism and the Role of Cp* Noninnocence. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00889] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shrinwantu Pal
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Shuhei Kusumoto
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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17
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Scharf LT, Weismann J, Feichtner KS, Lindl F, Gessner VH. Versatile Modes of Cooperative B−H Bond Activation Reactions in Ruthenium-Carbene Complexes: Addition, Ring-Opening and Insertion. Chemistry 2018; 24:3439-3443. [DOI: 10.1002/chem.201800248] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Indexed: 12/30/2022]
Affiliation(s)
- Lennart T. Scharf
- Chair of Inorganic Chemistry II, Faculty of Chemistry and Biochemistry; Ruhr University Bochum; Universitätsstrasse 150 44780 Bochum Germany
| | - Julia Weismann
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Kai-Stephan Feichtner
- Chair of Inorganic Chemistry II, Faculty of Chemistry and Biochemistry; Ruhr University Bochum; Universitätsstrasse 150 44780 Bochum Germany
| | - Felix Lindl
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg 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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18
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Feichtner KS, Gessner VH. Cooperative bond activation reactions with carbene complexes. Chem Commun (Camb) 2018; 54:6540-6553. [DOI: 10.1039/c8cc02198h] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This review highlights the recent advances in the application of carbene complexes in bond activation reactions via metal–ligand cooperation.
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Affiliation(s)
- Kai-Stephan Feichtner
- Inorganic Chemistry II
- Faculty of Chemistry and Biochemistry
- Ruhr University Bochum
- 44801 Bochum
- Germany
| | - Viktoria H. Gessner
- Inorganic Chemistry II
- Faculty of Chemistry and Biochemistry
- Ruhr University Bochum
- 44801 Bochum
- Germany
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19
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Burkhardt L, Holzwarth M, Plietker B, Bauer M. Detection and Characterization of Hydride Ligands in Iron Complexes by High-Resolution Hard X-ray Spectroscopy and Implications for Catalytic Processes. Inorg Chem 2017; 56:13300-13310. [PMID: 29058447 DOI: 10.1021/acs.inorgchem.7b02063] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Two hydride catalysts [Fe(CO)(dppp)H(NO)] (dppp = 1,3-bis(diphenylphosphino)propane) and [Fe(CO)H(NO)(PPh3)2] in comparison with nonhydride analogues [Fe(dppe)(NO)2] (dppe = 1,3-bis(diphenylphosphino)ethane) and [Fe(NO)2(PPh3)2] are investigated with a combination of valence-to-core X-ray emission spectroscopy (VtC-XES) and high-energy resolution fluorescence detected X-ray absorption near-edge structure (HERFD-XANES). To fully understand the experiments and to obtain precise information about molecular levels being involved in the spectral signals, time-dependent density functional theory (TD-DFT) calculations and ground state density functional theory (DFT) calculations are necessary. An excellent agreement between experiment and theory allows the identification of particular spectral signals of the Fe-H group. Antibonding Fe-H interactions clearly contribute to pre-edge signals in HERFD-XANES spectra, while bonding Fe-H interactions cause characteristic signatures in the VtC-XES spectra. The sensitivity of both methods with respect to the Fe-H distance is demonstrated by a scanning simulation approach. The results open the way to study metal hydride complexes in situ, their formation, and their fate during catalytic reactions, using high-resolution XANES and valence-to-core X-ray emission spectroscopy.
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Affiliation(s)
- Lukas Burkhardt
- Department Chemie, Universität Paderborn , Warburger Straße 100, D-33098 Paderborn, Germany
| | - Michael Holzwarth
- Institut für Organische Chemie, Universität Stuttgart , Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Bernd Plietker
- Institut für Organische Chemie, Universität Stuttgart , Pfaffenwaldring 55, D-70569 Stuttgart, Germany
| | - Matthias Bauer
- Department Chemie, Universität Paderborn , Warburger Straße 100, D-33098 Paderborn, Germany
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20
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Ramaraj A, Reddy KHK, Keil H, Herbst-Irmer R, Stalke D, Jemmis ED, Jagirdar BR. Approaches to Sigma Complexes via Displacement of Agostic Interactions: An Experimental and Theoretical Investigation. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00210] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. Ramaraj
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - K. Hari Krishna Reddy
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - Helena Keil
- Institut
für Anorganische Chemie, Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Regine Herbst-Irmer
- Institut
für Anorganische Chemie, Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Dietmar Stalke
- Institut
für Anorganische Chemie, Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Eluvathingal D. Jemmis
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - Balaji R. Jagirdar
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India
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21
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Lin YC, Hatzakis E, McCarthy SM, Reichl KD, Lai TY, Yennawar HP, Radosevich AT. P-N Cooperative Borane Activation and Catalytic Hydroboration by a Distorted Phosphorous Triamide Platform. J Am Chem Soc 2017; 139:6008-6016. [PMID: 28398750 DOI: 10.1021/jacs.7b02512] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Studies of the stoichiometric and catalytic reactivity of a geometrically constrained phosphorous triamide 1 with pinacolborane (HBpin) are reported. The addition of HBpin to phosphorous triamide 1 results in cleavage of the B-H bond of pinacolborane through addition across the electrophilic phosphorus and nucleophilic N-methylanilide sites in a cooperative fashion. The kinetics of this process of were investigated by NMR spectroscopy, with the determined overall second-order empirical rate law given by ν = -k[1][HBpin], where k = 4.76 × 10-5 M-1 s-1 at 25 °C. The B-H bond activation process produces P-hydrido-1,3,2-diazaphospholene intermediate 2, which exhibits hydridic reactivity capable of reacting with imines to give phosphorous triamide intermediates, as confirmed by independent synthesis. These phosphorous triamide intermediates are typically short lived, evolving with elimination of the N-borylamine product of imine hydroboration with regeneration of the deformed phosphorous triamide 1. The kinetics of this latter process are shown to be first-order, indicative of a unimolecular mechanism. Consequently, catalytic hydroboration of a variety of imine substrates can be realized with 1 as the catalyst and HBpin as the terminal reagent. A mechanistic proposal implicating a P-N cooperative mechanism for catalysis that incorporates the various independently verified stoichiometric steps is presented, and a comparison to related phosphorus-based systems is offered.
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Affiliation(s)
- Yi-Chun Lin
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Emmanuel Hatzakis
- Department of Food Science and Technology, The Ohio State University , Columbus, Ohio 43210, United States
| | | | | | | | | | - Alexander T Radosevich
- Department of Chemistry, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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22
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Todisco S, Luconi L, Giambastiani G, Rossin A, Peruzzini M, Golub IE, Filippov OA, Belkova NV, Shubina ES. Ammonia Borane Dehydrogenation Catalyzed by (κ4-EP3)Co(H) [EP3 = E(CH2CH2PPh2)3; E = N, P] and H2 Evolution from Their Interaction with NH Acids. Inorg Chem 2017; 56:4296-4307. [DOI: 10.1021/acs.inorgchem.6b02673] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stefano Todisco
- 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
Street 18, 420008 Kazan, Russia
| | - Andrea Rossin
- Istituto di Chimica dei Composti Organometallici−Consiglio Nazionale delle Ricerche (ICCOM - CNR), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy
| | - Maurizio Peruzzini
- Istituto di Chimica dei Composti Organometallici−Consiglio Nazionale delle Ricerche (ICCOM - CNR), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy
| | - Igor E. Golub
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Street 28, 119991 Moscow, Russia
- People’s Friendship University of Russia (RUDN
University), 6 Miklukho-Maklay St., 117198 Moscow, Russia
| | - Oleg A. Filippov
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Street 28, 119991 Moscow, Russia
| | - Natalia V. Belkova
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Street 28, 119991 Moscow, Russia
| | - Elena S. Shubina
- A.N.
Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Street 28, 119991 Moscow, Russia
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23
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Transfer hydrogenation of ketones catalyzed by complexes of ruthenium(II) with the heterotridentate [P,N,O] ligands (S)-2-[{2-(diphenylphosphanyl)benzylidene}amino]propan-1-ol, (S)-2-[{2-(diphenylphosphanyl)benzyl}amino]propan-1-ol or the [P,N,S] ligand (S)-2-(dimethylamino)-1-(diphenylphosphino)-3-(methylthio)propane. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2016.12.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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24
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Vondung L, Frank N, Fritz M, Alig L, Langer R. Phosphine-Stabilized Borylenes and Boryl Anions as Ligands? Redox Reactivity in Boron-Based Pincer Complexes. Angew Chem Int Ed Engl 2016; 55:14450-14454. [DOI: 10.1002/anie.201605838] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/12/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Lisa Vondung
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Nicolas Frank
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Maximilian Fritz
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Lukas Alig
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Robert Langer
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
- Lehn Institute of Functional Material (LIFM); Sun Yat-Sen University Guangzhou (SYSU); Xingang Road West Guangzhou 510275 PR China
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25
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Vondung L, Frank N, Fritz M, Alig L, Langer R. Phosphan-stabilisierte Borylene und Boryl-Anionen als Liganden? Redoxaktivität in Bor-basierten Pinzetten-Komplexen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605838] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lisa Vondung
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Nicolas Frank
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Maximilian Fritz
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Lukas Alig
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Robert Langer
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
- Lehn Institute of Functional Material (LIFM); Sun Yat-Sen University Guangzhou (SYSU); Xingang Road West Guangzhou 510275 PR China
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26
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Eleazer B, Smith MD, Popov AA, Peryshkov DV. (BB)-Carboryne Complex of Ruthenium: Synthesis by Double B-H Activation at a Single Metal Center. J Am Chem Soc 2016; 138:10531-8. [PMID: 27526855 PMCID: PMC4999960 DOI: 10.1021/jacs.6b05172] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Indexed: 12/22/2022]
Abstract
The first example of a transition metal (BB)-carboryne complex containing two boron atoms of the icosahedral cage connected to a single exohedral metal center (POBBOP)Ru(CO)2 (POBBOP = 1,7-OP(i-Pr)2-2,6-dehydro-m-carborane) was synthesized by double B-H activation within the strained m-carboranyl pincer framework. Theoretical calculations revealed that the unique three-membered (BB)>Ru metalacycle is formed by two bent B-Ru σ-bonds with the concomitant increase of the bond order between the two metalated boron atoms. The reactivity of the highly strained electron-rich (BB)-carboryne fragment with small molecules was probed by reactions with electrophiles. The carboryne-carboranyl transformations reported herein represent a new mode of cooperative metal-ligand reactivity of boron-based complexes.
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Affiliation(s)
- Bennett
J. Eleazer
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
| | - Alexey A. Popov
- Leibniz
Institute for Solid State and Materials Research, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Dmitry V. Peryshkov
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
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27
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Esteruelas MA, López AM, Oliván M. Polyhydrides of Platinum Group Metals: Nonclassical Interactions and σ-Bond Activation Reactions. Chem Rev 2016; 116:8770-847. [DOI: 10.1021/acs.chemrev.6b00080] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Miguel A. Esteruelas
- Departamento de
Química
Inorgánica, Instituto de Síntesis Química
y Catálisis Homogénea (ISQCH), Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Universidad de Zaragoza−CSIC, 50009 Zaragoza, Spain
| | - Ana M. López
- Departamento de
Química
Inorgánica, Instituto de Síntesis Química
y Catálisis Homogénea (ISQCH), Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Universidad de Zaragoza−CSIC, 50009 Zaragoza, Spain
| | - Montserrat Oliván
- Departamento de
Química
Inorgánica, Instituto de Síntesis Química
y Catálisis Homogénea (ISQCH), Centro de Innovación
en Química Avanzada (ORFEO−CINQA), Universidad de Zaragoza−CSIC, 50009 Zaragoza, Spain
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28
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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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29
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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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30
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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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31
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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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32
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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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33
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Drover MW, Schafer LL, Love JA. Capturing HBCy2
: Using N,O-Chelated Complexes of Rhodium(I) and Iridium(I) for Chemoselective Hydroboration. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511448] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Marcus W. Drover
- 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
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34
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Drover MW, Schafer LL, Love JA. Capturing HBCy2: Using N,O-Chelated Complexes of Rhodium(I) and Iridium(I) for Chemoselective Hydroboration. Angew Chem Int Ed Engl 2016; 55:3181-6. [PMID: 26847809 DOI: 10.1002/anie.201511448] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2015] [Indexed: 01/12/2023]
Abstract
1,3-N,O-chelated complexes of Rh(I) and Ir(I) cooperatively and reversibly stabilized the B-H bond of HBCy2 to afford six-membered metallaheterocycles (M=Rh (7) or Ir (8)) having a δ-[M]⋅⋅⋅H-B agostic interaction. Treatment of these Shimoi-type borane adducts 7 or 8 with both an aldehyde and an alkene resulted in chemoselective aldehyde hydroboration and reformation of the 1,3-N,O-chelated starting material. The observed chemoselectivity is inverted from that of free HBCy2 , which is selective for alkene hydroboration.
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Affiliation(s)
- Marcus W Drover
- 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.
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35
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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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36
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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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37
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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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38
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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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39
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Ganguly G, Malakar T, Paul A. Theoretical Studies on the Mechanism of Homogeneous Catalytic Olefin Hydrogenation and Amine–Borane Dehydrogenation by a Versatile Boryl-Ligand-Based Cobalt Catalyst. ACS Catal 2015. [DOI: 10.1021/cs501359n] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Gaurab Ganguly
- Raman Center
for Atomic,
Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Tanmay Malakar
- Raman Center
for Atomic,
Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Ankan Paul
- Raman Center
for Atomic,
Molecular and Optical Sciences, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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40
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Hu X, Soleilhavoup M, Melaimi M, Chu J, Bertrand G. Air‐Stable (CAAC)CuCl and (CAAC)CuBH
4
Complexes as Catalysts for the Hydrolytic Dehydrogenation of BH
3
NH
3. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500224] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Xingbang Hu
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (P.R. China)
| | - Michèle Soleilhavoup
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
| | - Mohand Melaimi
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
| | - Jiaxiang Chu
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
| | - Guy Bertrand
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
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41
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Hu X, Soleilhavoup M, Melaimi M, Chu J, Bertrand G. Air‐Stable (CAAC)CuCl and (CAAC)CuBH
4
Complexes as Catalysts for the Hydrolytic Dehydrogenation of BH
3
NH
3. Angew Chem Int Ed Engl 2015; 54:6008-11. [DOI: 10.1002/anie.201500224] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Indexed: 02/01/2023]
Affiliation(s)
- Xingbang Hu
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093 (P.R. China)
| | - Michèle Soleilhavoup
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
| | - Mohand Melaimi
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
| | - Jiaxiang Chu
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
| | - Guy Bertrand
- UCSD‐CNRS Joint Research Chemistry Laboratory (UMI 3555), Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093‐0343 (USA)
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42
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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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43
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44
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Nako AE, White AJP, Crimmin MR. Bis(σ-B–H) complexes of copper(i): precursors to a heterogeneous amine–borane dehydrogenation catalyst. Dalton Trans 2015; 44:12530-4. [DOI: 10.1039/c5dt02144h] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of bis(σ-B–H) complexes of copper(i) have been prepared by displacement of arene solvent from a β-diketiminate copper(i) complex by four-coordinate boranes, H3B–L (L = NMe3, lutidine).
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Affiliation(s)
- Adi E. Nako
- Department of Chemistry
- Imperial College London
- London SW7 2AZ
- UK
| | | | - Mark R. Crimmin
- Department of Chemistry
- Imperial College London
- London SW7 2AZ
- UK
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45
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Calvo B, Roy B, Macías R, Artigas MJ, Lahoz FJ, Oro LA. NH3-promoted ligand lability in eleven-vertex rhodathiaboranes. Inorg Chem 2014; 53:12428-36. [PMID: 25382790 DOI: 10.1021/ic501779n] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The reaction of the 11-vertex rhodathiaborane, [8,8-(PPh3)2-nido-8,7-RhSB9H10] (1), with NH3 affords inmediately the adduct, [8,8,8-(NH3)(PPh3)2-nido-8,7-RhSB9H10] (4). The NH3-Rh interaction induces the labilization of the PPh3 ligands leading to the dissociation product, [8,8-(NH3)(PPh3)-nido-8,7-RhSB9H10] (5), which can then react with another molecule of NH3 to give [8,8,8-(NH3)2(PPh3)-nido-8,7-RhSB9H10] (6). These clusters have been characterized in situ by multielement NMR spectroscopy at different temeperatures. The variable temperature behavior of the system demonstrates that the intermediates 4-6 are in equilibrium, involving ligand exchange processes. On the basis of low intensity signals present in the (1)H NMR spectra of the reaction mixture, some species are tentatively proposed to be the bis- and tris-NH3 ligated clusters, [8,8-(NH3)2-nido-8,7-RhSB9H10] (7) and [8,8,8-(NH3)3-nido-8,7-RhSB9H10] (8). After evaporation of the solvent and the excess of NH3, the system containing species 4-8 regenerates the starting reactant, 1, thus closing a stoichiometric cycle of ammonia addition and loss. After 40 h at room temperature, the reaction of 1 with NH3 gives the hydridorhodathiaborane, [8,8,8-(H)(PPh3)2-nido-8,7-RhSB9H9] (2), as a single product. The reported rhodathiaboranes show reversible H3N-promoted ligand lability, which implies weak Rh-N interactions, leading to a rare case of metal complexes that circumvent "classical" Werner chemistry.
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Affiliation(s)
- Beatriz Calvo
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea, Universidad de Zaragoza-CSIC , 50009-Zaragoza, Spain
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46
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Rossin A, Rossi A, Peruzzini M, Zanobini F. Chemical Hydrogen Storage: Ammonia Borane Dehydrogenation Catalyzed by NP3Ruthenium Hydrides (NP3=N(CH2CH2PPh2)3). Chempluschem 2014. [DOI: 10.1002/cplu.201402108] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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47
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Bellham P, Hill MS, Kociok-Köhn G. Stoichiometric and Catalytic Reactivity of tert-Butylamine–Borane with Calcium Silylamides. Organometallics 2014. [DOI: 10.1021/om500467b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Peter Bellham
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, U.K
| | - Michael S. Hill
- Department of Chemistry, University of Bath, Claverton
Down, Bath BA2 7AY, U.K
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48
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Johnson HC, Leitao EM, Whittell GR, Manners I, Lloyd-Jones GC, Weller AS. Mechanistic Studies of the Dehydrocoupling and Dehydropolymerization of Amine–Boranes Using a [Rh(Xantphos)]+ Catalyst. J Am Chem Soc 2014; 136:9078-93. [DOI: 10.1021/ja503335g] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Heather C. Johnson
- Department
of Chemistry, Chemistry Research Laboratories, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Erin M. Leitao
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - George R. Whittell
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Ian Manners
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Guy C. Lloyd-Jones
- School
of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Andrew S. Weller
- Department
of Chemistry, Chemistry Research Laboratories, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
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49
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Wang Q, Motika SE, Akhmedov NG, Petersen JL, Shi X. Synthesis of Cyclic Amine Boranes through Triazole-Gold(I)-Catalyzed Alkyne Hydroboration. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402614] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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Wang Q, Motika SE, Akhmedov NG, Petersen JL, Shi X. Synthesis of Cyclic Amine Boranes through Triazole-Gold(I)-Catalyzed Alkyne Hydroboration. Angew Chem Int Ed Engl 2014; 53:5418-22. [DOI: 10.1002/anie.201402614] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Indexed: 11/09/2022]
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