1
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Zhang C, Jiang X, Jing Y, Zhang N, Wang P, Wang H, Jiang K, Chen XM, Chen X. Synthesis, Structures, and Reactivities of BCN-Heterocyclic B-N Chains. Inorg Chem 2024; 63:10519-10526. [PMID: 38804144 DOI: 10.1021/acs.inorgchem.4c00772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
The BCN-heterocyclic B-N chain compounds, the sodium and potassium salts of 3 and 4 anions (Na3, Na4, and K4), were synthesized by reactions of ethane 1,2-diamineborane (BH3NH2CH2CH2NH2BH3, 1) and propane 1,2-diamineborane (BH3NH2CH2CH2CH2NH2BH3, 2) with MH (M = Na and K). Then, the neutral B-N chain compounds 5 and 6 were prepared with dehydrogenation of [NH4]3 and [NH4]4, formed by metathesis reactions of Na3 and Na4 with NH4Cl or NH4SCN, respectively. Compounds 7 and 8, analog 5, were also prepared using pyridine and 4-methoxypyridine instead of NH3 in 5. These synthesized compounds were characterized spectroscopically, and the singe-crystal structures of the Na3·18-crown-6 and K4·18-crown-6 adducts were determined. Furthermore, the reactions of Na3 and Na4 with cationic B-N chain compounds, [NH3BH2NH3]Cl and [NH3BH2NH2BH2NH3]Cl, could not form longer BCN-heterocyclic B-N chain. The solubility of metal hydrides, the ability for proton abstracting, the basicity of Lewis bases, and the chelate effect may influence these reactions even though the reaction mechanism is not fully understood.
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Affiliation(s)
- Chen Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xin Jiang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yi Jing
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
| | - Na Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Peng Wang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Hongju Wang
- School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
| | - Kai Jiang
- School of Environment, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xi-Meng Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Materials, Henan Normal University, Xinxiang, Henan 453007, China
- College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
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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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Peng C, Liu W, Wang Y. Mechanistic insights into H 3B·NMeH 2 dehydrogenation by Co-based complexes: a DFT perspective. NEW J CHEM 2023. [DOI: 10.1039/d2nj06155d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
Abstract
Mechanistic insights into Co-catalyzed H3B·NMeH2 dehydrogenation and polyaminoborane formation are carefully investigated using density functional theory.
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Affiliation(s)
- Cheng Peng
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Wei Liu
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Yong Wang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
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4
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Brodie CN, Sotorrios L, Boyd TM, Macgregor SA, Weller AS. Dehydropolymerization of H 3B·NMeH 2 Mediated by Cationic Iridium(III) Precatalysts Bearing κ 3- iPr-PN RP Pincer Ligands ( R = H, Me): An Unexpected Inner-Sphere Mechanism. ACS Catal 2022; 12:13050-13064. [PMID: 36313521 PMCID: PMC9594342 DOI: 10.1021/acscatal.2c03778] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/27/2022] [Indexed: 11/30/2022]
Abstract
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The dehydropolymerization of H3B·NMeH2 to form N-methylpolyaminoborane using neutral
and
cationic catalysts based on the {Ir(iPr-PNHP)} fragment [iPr-PNHP = κ3-(CH2CH2PiPr2)2NH] is reported. Neutral
Ir(iPr-PNHP)H3 or
Ir(iPr-PNHP)H2Cl
precatalysts show no, or poor and unselective, activity respectively
at 298 K in 1,2-F2C6H4 solution.
In contrast, addition of [NMeH3][BArF4] (ArF = 3,5-(CF3)2C6H3) to Ir(iPr-PNHP)H3 immediately starts catalysis, suggesting that a cationic
catalytic manifold operates. Consistent with this, independently synthesized
cationic precatalysts are active (tested between 0.5 and 2.0 mol %
loading) producing poly(N-methylaminoborane) with Mn ∼ 40,000 g/mol, Đ ∼1.5, i.e., dihydrogen/dihydride, [Ir(iPr-PNHP)(H)2(H2)][BArF4]; σ-amine-borane [Ir(iPr-PNHP)(H)2(H3B·NMe3)][BArF4]; and [Ir(iPr-PNHP)(H)2(NMeH2)][BArF4]. Density functional theory (DFT) calculations
probe hydride exchange processes in two of these complexes and also
show that the barrier to amine-borane dehydrogenation is lower (22.5
kcal/mol) for the cationic system compared with the neutral system
(24.3 kcal/mol). The calculations show that the dehydrogenation proceeds
via an inner-sphere process without metal–ligand cooperativity,
and this is supported experimentally by N–Me substituted [Ir(iPr-PNMeP)(H)2(H3B·NMe3)][BArF4] being
an active catalyst. Key to the lower barrier calculated for the cationic
system is the outer-sphere coordination of an additional H3B·NMeH2 with the N–H group of the ligand.
Experimentally, kinetic studies indicate a complex reaction manifold
that shows pronounced deceleratory temporal profiles. As supported
by speciation and DFT studies, a key observation is that deprotonation
of [Ir(iPr-NHP)(H)2(H2)][BArF4], formed upon amine-borane
dehydrogenation, by the slow in situ formation of NMeH2 (via B–N bond cleavage), results in the formation of essentially
inactive Ir(iPr-PNHP)H3, with a coproduct of [NMeH3]+/[H2B(NMeH2)2]+. While reprotonation
of Ir(iPr-PNHP)H3 results in a return to the cationic cycle, it is proposed, supported
by doping experiments, that reprotonation is attenuated by entrainment
of the [NMeH3]+/[H2B(NMeH2)2]+/catalyst in insoluble polyaminoborane.
The role of [NMeH3]+/[H2B(NMeH2)]+ as chain control agents is also noted.
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Affiliation(s)
| | - Lia Sotorrios
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Timothy M. Boyd
- Department of Chemistry, University of York, York YO10 5DD, U.K
- Chemistry Research Laboratories, University of Oxford, Oxford OX1 3TA, U.K
| | - Stuart A. Macgregor
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
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5
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Bhattacharjee I, Sultana M, Bhunya S, Paul A. The curious saga of dehydrogenation/hydrogenation for chemical hydrogen storage: a mechanistic perspective. Chem Commun (Camb) 2022; 58:1672-1684. [PMID: 35024699 DOI: 10.1039/d1cc06238g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydrogen storage is an indispensable component of hydrogen-based fuel economy. Chemical hydrogen storage relies on the development of lightweight compounds which can deliver high weight percentage of H2 at moderate temperatures through dehydrogenation and can be recovered from the dehydrogenated mass by hydrogenation for reuse. In this feature article we primarily discuss the mechanistic underpinnings of the catalytic dehydrogenation of ammonia-borane, a potential candidate for hydrogen storage and the challenges associated with its regeneration from the dehydrogenated mass. Moreover, we highlight the mechanistic intricacies, viability, sustainability and unresolved issues of allied chemical hydrogen storage avenues such as the CH3OH-CO2 cycle.
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Affiliation(s)
| | - Munia Sultana
- Indian Association for the Cultivation of Science, Kolkata, India.
| | - Sourav Bhunya
- Indian Association for the Cultivation of Science, Kolkata, India.
| | - Ankan Paul
- Indian Association for the Cultivation of Science, Kolkata, India.
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6
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Brodie CN, Boyd TM, Sotorríos L, Ryan DE, Magee E, Huband S, Town JS, Lloyd-Jones GC, Haddleton DM, Macgregor SA, Weller AS. Controlled Synthesis of Well-Defined Polyaminoboranes on Scale Using a Robust and Efficient Catalyst. J Am Chem Soc 2021; 143:21010-21023. [PMID: 34846131 DOI: 10.1021/jacs.1c10888] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The air tolerant precatalyst, [Rh(L)(NBD)]Cl ([1]Cl) [L = κ3-(iPr2PCH2CH2)2NH, NBD = norbornadiene], mediates the selective synthesis of N-methylpolyaminoborane, (H2BNMeH)n, by dehydropolymerization of H3B·NMeH2. Kinetic, speciation, and DFT studies show an induction period in which the active catalyst, Rh(L)H3 (3), forms, which sits as an outer-sphere adduct 3·H3BNMeH2 as the resting state. At the end of catalysis, dormant Rh(L)H2Cl (2) is formed. Reaction of 2 with H3B·NMeH2 returns 3, alongside the proposed formation of boronium [H2B(NMeH2)2]Cl. Aided by isotopic labeling, Eyring analysis, and DFT calculations, a mechanism is proposed in which the cooperative "PNHP" ligand templates dehydrogenation, releasing H2B═NMeH (ΔG‡calc = 19.6 kcal mol-1). H2B═NMeH is proposed to undergo rapid, low barrier, head-to-tail chain propagation for which 3 is the catalyst/initiator. A high molecular weight polymer is formed that is relatively insensitive to catalyst loading (Mn ∼71 000 g mol-1; Đ, of ∼ 1.6). The molecular weight can be controlled using [H2B(NMe2H)2]Cl as a chain transfer agent, Mn = 37 900-78 100 g mol-1. This polymerization is suggested to arise from an ensemble of processes (catalyst speciation, dehydrogenation, propagation, chain transfer) that are geared around the concentration of H3B·NMeH2. TGA and DSC thermal analysis of polymer produced on scale (10 g, 0.01 mol % [1]Cl) show a processing window that allows for melt extrusion of polyaminoborane strands, as well as hot pressing, drop casting, and electrospray deposition. By variation of conditions in the latter, smooth or porous microstructured films or spherical polyaminoboranes beads (∼100 nm) result.
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Affiliation(s)
- Claire N Brodie
- Department of Chemistry, University of York, Heslington, York YO31 1ES, U.K
| | - Timothy M Boyd
- Department of Chemistry, University of York, Heslington, York YO31 1ES, U.K.,Department of Chemistry, University of Oxford, Oxford OX1 3TA, U.K
| | - Lia Sotorríos
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - David E Ryan
- Department of Chemistry, University of York, Heslington, York YO31 1ES, U.K.,Department of Chemistry, University of Oxford, Oxford OX1 3TA, U.K
| | - Eimear Magee
- International Institute for Nanocomposites Manufacturing, WMG, University of Warwick, Coventry CV4 7AL, U.K
| | - Steven Huband
- Department of Physics, University of Warwick, Coventry CV4 7AL, U.K
| | - James S Town
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
| | - Guy C Lloyd-Jones
- School of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, Scotland, U.K
| | - David M Haddleton
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, U.K
| | - Stuart A Macgregor
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K
| | - Andrew S Weller
- Department of Chemistry, University of York, Heslington, York YO31 1ES, U.K
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7
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Siewert JE, Schumann A, Hering-Junghans C. Phosphine-catalysed reductive coupling of dihalophosphanes. Dalton Trans 2021; 50:15111-15117. [PMID: 34611690 DOI: 10.1039/d1dt03095g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Classically tetraaryl diphosphanes have been synthesized through Wurtz-type reductive coupling of halophosphanes R2PX or more recently, through the dehydrocoupling of phosphines R2PH. Catalytic variants of the dehydrocoupling reaction have been reported, but are limited to R2PH compounds. Using PEt3 as a catalyst, we now show that TipPBr2 (Tip = 2,4,6-iPr3C6H2) is selectively coupled to give the dibromodiphosphane (TipPBr)2 (1), a compound not accessible using classic Mg reduction. Surprisingly, when using DipPBr2 (Dip = 2,6-iPr3C6H3) in the PEt3 catalysed reductive coupling the diphosphene (PDip)2 (2) with a PP double was formed selectively. In benzene solutions (PDip)2 has a half life time of ca. 28 days and can be utilized with NHCs to access NHC-phosphinidene adducts. To show that this protocol is more widely applicable, we show that Ph2PCl and Mes2PX (X = Cl, Br) are efficiently coupled using 10 mol% of PEt3 to give (Ph2P)2 and (Mes2P)2, respectively. Control experiments show that [BrPEt3]Br is a potential oxidation product in the catalytic cycle, which can be debrominated by Zn dust as a sacrificial reductant.
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Affiliation(s)
- Jan-Erik Siewert
- Leibniz Institut für Katalyse e.V. (LIKAT), A.-Einstein-Str. 29a, 18059 Rostock, Germany.
| | - André Schumann
- Leibniz Institut für Katalyse e.V. (LIKAT), A.-Einstein-Str. 29a, 18059 Rostock, Germany.
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8
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Zhang S, Zhai X, Song Y, Feng L, Tung CH, Wang W. Insertion of BH3 into a Cobalt–Aryl Bond: Synthetic Routes to Arylborohydride and Borane-Amino Hydride Complexes. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shengnan Zhang
- School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan, 250100, People’s Republic of China
| | - Xiaofang Zhai
- School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan, 250100, People’s Republic of China
| | - Yike Song
- School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan, 250100, People’s Republic of China
| | - Lei Feng
- School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan, 250100, People’s Republic of China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan, 250100, People’s Republic of China
| | - Wenguang Wang
- School of Chemistry and Chemical Engineering, Shandong University, No. 27 South Shanda Road, Jinan, 250100, People’s Republic of China
- College of Chemistry, Beijing Normal University, No. 19 Xinjiekouwai Street, Haidian District, Beijing, 100875, People’s Republic of China
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9
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Demirci UB. Mechanistic insights into the thermal decomposition of ammonia borane, a material studied for chemical hydrogen storage. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01366h] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We have now a better understanding of the mechanisms of thermal decomposition of ammonia borane, a widely studied hydrogen storage material.
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Affiliation(s)
- Umit B. Demirci
- Institut Européen des Membranes
- IEM – UMR 5635
- ENSCM
- CNRS
- Univ Montpellier
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10
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Nugent JW, García-Melchor M, Fout AR. Cobalt-Catalyzed Ammonia Borane Dehydrogenation: Mechanistic Insight and Isolation of a Cobalt Hydride-Amidoborane Complex. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00459] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Joseph W. Nugent
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
| | - Max García-Melchor
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin, College Green, Dublin 2, Ireland
| | - Alison R. Fout
- School of Chemical Sciences, University of Illinois at Urbana−Champaign, 600 South Matthews Avenue, Urbana, Illinois 61801, United States
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11
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Spearing-Ewyn EAK, Beattie NA, Colebatch AL, Martinez-Martinez AJ, Docker A, Boyd TM, Baillie G, Reed R, Macgregor SA, Weller AS. The role of neutral Rh(PONOP)H, free NMe 2H, boronium and ammonium salts in the dehydrocoupling of dimethylamine-borane using the cationic pincer [Rh(PONOP)(η 2-H 2)] + catalyst. Dalton Trans 2019; 48:14724-14736. [PMID: 31538996 DOI: 10.1039/c9dt03358k] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The σ-amine-borane pincer complex [Rh(PONOP)(η1-H3B·NMe3)][BArF4] [2, PONOP = κ3-NC5H3-2,6-(OPtBu2)2] is prepared by addition of H3B·NMe3 to the dihydrogen precursor [Rh(PONOP)(η2-H2)][BArF4], 1. In a similar way the related H3B·NMe2H complex [Rh(PONOP)(η1-H3B·NMe2H)][BArF4], 3, can be made in situ, but this undergoes dehydrocoupling to reform 1 and give the aminoborane dimer [H2BNMe2]2. NMR studies on this system reveal an intermediate neutral hydride forms, Rh(PONOP)H, 4, that has been prepared independently. 1 is a competent catalyst (2 mol%, ∼30 min) for the dehydrocoupling of H3B·Me2H. Kinetic, mechanistic and computational studies point to the role of NMe2H in both forming the neutral hydride, via deprotonation of a σ-amine-borane complex and formation of aminoborane, and closing the catalytic cycle by reprotonation of the hydride by the thus-formed dimethyl ammonium [NMe2H2]+. Competitive processes involving the generation of boronium [H2B(NMe2H)2]+ are also discussed, but shown to be higher in energy. Off-cycle adducts between [NMe2H2]+ or [H2B(NMe2H)2]+ and amine-boranes are also discussed that act to modify the kinetics of dehydrocoupling.
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12
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Brosge F, Lorenz T, Helten H, Bolm C. BN- and BO-Doped Inorganic-Organic Hybrid Polymers with Sulfoximine Core Units. Chemistry 2019; 25:12708-12711. [PMID: 31433083 PMCID: PMC6790941 DOI: 10.1002/chem.201903289] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 08/20/2019] [Indexed: 01/19/2023]
Abstract
While polysulfones constitute a class of well-established, highly valuable applied materials, knowledge about polymers based on the related sulfoximine group is very limited. We have employed functionalized diaryl sulfoximines and a p-phenylene bisborane as building blocks for unprecedented BN- and BO-doped alternating inorganic-organic hybrid copolymers. While the former were accessed by a facile silicon/boron exchange protocol, the synthesis of polymers with main-chain B-O linkages was achieved by salt elimination.
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Affiliation(s)
- Felix Brosge
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Thomas Lorenz
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.,Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Holger Helten
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany.,Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Carsten Bolm
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
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13
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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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14
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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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15
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Homo- and heterodehydrocoupling of phosphines mediated by alkali metal catalysts. Nat Commun 2019; 10:2786. [PMID: 31243267 PMCID: PMC6594957 DOI: 10.1038/s41467-019-09832-4] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 03/21/2019] [Indexed: 12/24/2022] Open
Abstract
Catalytic chemistry that involves the activation and transformation of main group substrates is relatively undeveloped and current examples are generally mediated by expensive transition metal species. Herein, we describe the use of inexpensive and readily available tBuOK as a catalyst for P-P and P-E (E = O, S, or N) bond formation. Catalytic quantities of tBuOK in the presence of imine, azobenzene hydrogen acceptors, or a stoichiometric amount of tBuOK with hydrazobenzene, allow efficient homodehydrocoupling of phosphines under mild conditions (e.g. 25 °C and < 5 min). Further studies demonstrate that the hydrogen acceptors play an intimate mechanistic role. We also show that our tBuOK catalysed methodology is general for the heterodehydrocoupling of phosphines with alcohols, thiols and amines to generate a range of potentially useful products containing P-O, P-S, or P-N bonds.
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16
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Bai H, Zhang H, Zhang X, Wang L, Li S, Wei D, Zhu Y, Zhang W. Unravelling the Origins of Hydroboration Chemoselectivity Inversion Using an N,O-Chelated Ir(I) Complex: A Computational Study. J Org Chem 2019; 84:6709-6718. [DOI: 10.1021/acs.joc.9b00329] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Huining Bai
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
| | - Huimin Zhang
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
| | - Xinchao Zhang
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
| | - Lidong Wang
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
| | - Shijun Li
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
| | - Donghui Wei
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
| | - Yanyan Zhu
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
| | - Wenjing Zhang
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, Henan Province 450001, P.R. China
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17
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Osipova ES, Filippov OA, Shubina ES, Belkova NV. Non-covalent interactions in stoichiometric and catalytic reactions of iridium pincer complexes. MENDELEEV COMMUNICATIONS 2019. [DOI: 10.1016/j.mencom.2019.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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18
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Han D, Anke F, Trose M, Beweries T. Recent advances in transition metal catalysed dehydropolymerisation of amine boranes and phosphine boranes. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.09.016] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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19
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Colebatch AL, Weller AS. Amine-Borane Dehydropolymerization: Challenges and Opportunities. Chemistry 2019; 25:1379-1390. [PMID: 30338876 PMCID: PMC6391989 DOI: 10.1002/chem.201804592] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Indexed: 11/23/2022]
Abstract
The dehydropolymerization of amine-boranes, exemplified as H2 RB⋅NR'H2 , to produce polyaminoboranes (HRBNR'H)n that are inorganic analogues of polyolefins with alternating main-chain B-N units, is an area with significant potential, stemming from both fundamental (mechanism, catalyst development, main-group hetero-cross-coupling) and technological (new polymeric materials) opportunities. This Concept article outlines recent advances in the field, covering catalyst development and performance, current mechanistic models, and alternative non-catalytic routes for polymer production. The substrate scope, polymer properties and applications of these exciting materials are also outlined. Challenges and opportunities in the field are suggested, as a way of providing focus for future investigations.
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Affiliation(s)
- Annie L. Colebatch
- Department of ChemistryUniversity of CambridgeLensfield RoadCambridgeCB2 1EWUK
- Department of ChemistryUniversity of OxfordMansfield RoadOxfordOX1 3TAUK
| | - Andrew S. Weller
- Department of ChemistryUniversity of OxfordMansfield RoadOxfordOX1 3TAUK
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20
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Zafar M, Rongala R, Pradhan AN, Pathak K, Roisnel T, Halet JF, Ghosh S. Mercapto-benzothiazolyl based ruthenium(ii) borate complexes: synthesis and reactivity towards various phosphines. Dalton Trans 2019; 48:7413-7424. [DOI: 10.1039/c9dt00498j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Ruthenium complexes featuring phosphinate and dual Ru⋯H–B interactions between Ru and B–H bonds of borate ligands supported by mercapto-benzothiazolyl heterocycles have been synthesized.
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Affiliation(s)
- Mohammad Zafar
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Ramalakshmi Rongala
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Alaka Nanda Pradhan
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Kriti Pathak
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
| | - Thierry Roisnel
- Univ Rennes
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes
| | - Jean-François Halet
- Univ Rennes
- CNRS
- Institut des Sciences Chimiques de Rennes
- UMR 6226
- F-35042 Rennes
| | - Sundargopal Ghosh
- Department of Chemistry
- Indian Institute of Technology Madras
- Chennai 600036
- India
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21
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Zheng X, Huang J, Yao Y, Xu X. Stoichiometric reactions and catalytic dehydrogenations of amine–boranes with calcium aryloxide. Chem Commun (Camb) 2019; 55:9152-9155. [DOI: 10.1039/c9cc04698d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A calcium aryloxide complex reacts with amine–boranes to give unprecedented amine–borane coordinated complexes through Ca⋯H interactions, which serve as active species for catalytic dehydrogenation reactions.
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Affiliation(s)
- Xizhou Zheng
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Jiasu Huang
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Yingming Yao
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Xin Xu
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
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22
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23
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Luconi L, Osipova ES, Giambastiani G, Peruzzini M, Rossin A, Belkova NV, Filippov OA, Titova EM, Pavlov AA, Shubina ES. Amine Boranes Dehydrogenation Mediated by an Unsymmetrical Iridium Pincer Hydride: (PCN) vs (PCP) Improved Catalytic Performance. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00488] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Lapo Luconi
- Istituto di Chimica dei Composti Organometallici − Consiglio Nazionale delle Ricerche (ICCOM - CNR), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy
| | - Elena S. Osipova
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, 119991 Moscow, Russia
| | - Giuliano Giambastiani
- Istituto di Chimica dei Composti Organometallici − Consiglio Nazionale delle Ricerche (ICCOM - CNR), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy
- Institute of Chemistry and Processes for Energy, Environment and Health (ICPEES), UMR 7515 CNRS - University of Strasbourg (UdS), 25, rue Becquerel, 67087 Strasbourg Cedex
02, France
- Kazan Federal University, Kremlyovskaya Str. 18, 420008 Kazan, Russia
| | - Maurizio Peruzzini
- Istituto di Chimica dei Composti Organometallici − Consiglio Nazionale delle Ricerche (ICCOM - CNR), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy
| | - Andrea Rossin
- Istituto di Chimica dei Composti Organometallici − Consiglio Nazionale delle Ricerche (ICCOM - CNR), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy
| | - Natalia V. Belkova
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, 119991 Moscow, Russia
| | - Oleg A. Filippov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, 119991 Moscow, Russia
| | - Ekaterina M. Titova
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, 119991 Moscow, Russia
- Peoples’ Friendship University of Russia (RUDN University), 6 Miklukho-Maklay St, 117198 Moscow, Russia
| | - Alexander A. Pavlov
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, 119991 Moscow, Russia
| | - Elena S. Shubina
- A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences (INEOS RAS), Vavilova Str. 28, 119991 Moscow, Russia
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24
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Ayhan O, Riensch NA, Glasmacher C, Helten H. Cyclolinear Oligo- and Poly(iminoborane)s: The Missing Link in Inorganic Main-Group Macromolecular Chemistry. Chemistry 2018; 24:5883-5894. [DOI: 10.1002/chem.201705913] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Ozan Ayhan
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
| | - Nicolas A. Riensch
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
| | - Clemens Glasmacher
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
| | - Holger Helten
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
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25
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Adams GM, Colebatch AL, Skornia JT, McKay AI, Johnson HC, Lloyd−Jones GC, Macgregor SA, Beattie NA, Weller AS. Dehydropolymerization of H3B·NMeH2 To Form Polyaminoboranes Using [Rh(Xantphos-alkyl)] Catalysts. J Am Chem Soc 2018; 140:1481-1495. [DOI: 10.1021/jacs.7b11975] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Gemma M. Adams
- Chemistry Research Laboratories, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Annie L. Colebatch
- Chemistry Research Laboratories, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Joseph T. Skornia
- Chemistry Research Laboratories, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Alasdair I. McKay
- Chemistry Research Laboratories, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Heather C. Johnson
- Chemistry Research Laboratories, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Guy C. Lloyd−Jones
- School
of Chemistry, University of Edinburgh, Edinburgh EH9 3FJ, United Kingdom
| | - Stuart A. Macgregor
- Institute
of Chemical Sciences, Heriot Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Nicholas A. Beattie
- Institute
of Chemical Sciences, Heriot Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Andrew S. Weller
- Chemistry Research Laboratories, Mansfield Road, Oxford OX1 3TA, United Kingdom
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26
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Telleria A, Vicent C, San Nacianceno V, Garralda MA, Freixa Z. Experimental Evidence Supporting Related Mechanisms for Ru(II)-Catalyzed Dehydrocoupling and Hydrolysis of Amine-Boranes. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02958] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ainara Telleria
- Department
of Applied Chemistry, Faculty of Chemistry, University of the Basque Country (UPV-EHU), San Sebastián, 20018, Spain
| | - Cristian Vicent
- Serveis
Centrals d’Instrumentació Científica, Universidad Jaume I, Castelló, 12071, Spain
| | - Virginia San Nacianceno
- Department
of Applied Chemistry, Faculty of Chemistry, University of the Basque Country (UPV-EHU), San Sebastián, 20018, Spain
| | - María A. Garralda
- Department
of Applied Chemistry, Faculty of Chemistry, University of the Basque Country (UPV-EHU), San Sebastián, 20018, Spain
| | - Zoraida Freixa
- Department
of Applied Chemistry, Faculty of Chemistry, University of the Basque Country (UPV-EHU), San Sebastián, 20018, Spain
- IKERBASQUE, Basque
Foundation for Science, Bilbao, 48013, Spain
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27
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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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28
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Wang X, Hooper TN, Kumar A, Priest IK, Sheng Y, Samuels TOM, Wang S, Robertson AW, Pacios M, Bhaskaran H, Weller AS, Warner JH. Oligomeric aminoborane precursors for the chemical vapour deposition growth of few-layer hexagonal boron nitride. CrystEngComm 2017. [DOI: 10.1039/c6ce02006b] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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29
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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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30
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Bhunya S, Malakar T, Ganguly G, Paul A. Combining Protons and Hydrides by Homogeneous Catalysis for Controlling the Release of Hydrogen from Ammonia–Borane: Present Status and Challenges. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01704] [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)
- Sourav Bhunya
- Raman Centre for Atomic,
Molecular and
Optical Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Tanmay Malakar
- Raman Centre for Atomic,
Molecular and
Optical Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Gaurab Ganguly
- Raman Centre for Atomic,
Molecular and
Optical Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Ankan Paul
- Raman Centre for Atomic,
Molecular and
Optical Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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31
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Roy DK, Borthakur R, De A, Varghese B, Phukan AK, Ghosh S. Synthesis and Characterization of Bis(sigma)borate and Bis-zwitterionic Complexes of Rhodium and Iridium. ChemistrySelect 2016. [DOI: 10.1002/slct.201600980] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dipak Kumar Roy
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Rosmita Borthakur
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Anangsha De
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Babu Varghese
- SAIF; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Ashwini K. Phukan
- Department of Chemical Sciences; Tezpur University; Tezpur 784 028 India
| | - Sundargopal Ghosh
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
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32
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Esteruelas MA, Nolis P, Oliván M, Oñate E, Vallribera A, Vélez A. Ammonia Borane Dehydrogenation Promoted by a Pincer-Square-Planar Rhodium(I) Monohydride: A Stepwise Hydrogen Transfer from the Substrate to the Catalyst. Inorg Chem 2016; 55:7176-81. [DOI: 10.1021/acs.inorgchem.6b01216] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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
| | | | - 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
| | - Enrique Oñate
- 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
| | | | - Andrea Vélez
- 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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33
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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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34
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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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35
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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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36
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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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37
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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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38
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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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39
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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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40
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Iacobucci C, Reale S, De Angelis F. Elusive Reaction Intermediates in Solution Explored by ESI-MS: Reverse Periscope for Mechanistic Investigations. Angew Chem Int Ed Engl 2016; 55:2980-93. [DOI: 10.1002/anie.201507088] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 09/18/2015] [Indexed: 01/02/2023]
Affiliation(s)
- Claudio Iacobucci
- Dipartimento di Scienze Fisiche e Chimiche; Università dell'Aquila; Via Vetoio, Coppito 67100 L'Aquila Italy
| | - Samantha Reale
- Dipartimento di Scienze Fisiche e Chimiche; Università dell'Aquila; Via Vetoio, Coppito 67100 L'Aquila Italy
| | - Francesco De Angelis
- Dipartimento di Scienze Fisiche e Chimiche; Università dell'Aquila; Via Vetoio, Coppito 67100 L'Aquila Italy
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41
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Iacobucci C, Reale S, De Angelis F. Elektrospray-Massenspektrometrie: ein umgekehrtes Periskop zur Erforschung von Reaktionsmechanismen in Lösung. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201507088] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Claudio Iacobucci
- Dipartimento di Scienze Fisiche e Chimiche; Università dell'Aquila; Via Vetoio, Coppito 67100 L'Aquila Italien
| | - Samantha Reale
- Dipartimento di Scienze Fisiche e Chimiche; Università dell'Aquila; Via Vetoio, Coppito 67100 L'Aquila Italien
| | - Francesco De Angelis
- Dipartimento di Scienze Fisiche e Chimiche; Università dell'Aquila; Via Vetoio, Coppito 67100 L'Aquila Italien
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42
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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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43
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Kumar A, Priest IK, Hooper TN, Weller AS. Variable coordination modes and catalytic dehydrogenation of B-phenyl amine–boranes. Dalton Trans 2016; 45:6183-95. [DOI: 10.1039/c6dt00197a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The binding mode ofB-aryl substituted amine–boranes at {Rh(bisphoshine)}+fragments can manipulated by variation of the P–Rh–P bite-angle.
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Affiliation(s)
- Amit Kumar
- Department of Chemistry
- University of Oxford
- Oxford
- UK
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44
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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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45
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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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46
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Drover MW, Johnson HC, Schafer LL, Love JA, Weller AS. Reactivity of an Unsaturated Iridium(III) Phosphoramidate Complex, [Cp*Ir{κ2-N,O}][BArF4]. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00397] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Marcus W. Drover
- Department
of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
- Chemistry Research
Laboratories, Department of Chemistry, The University of Oxford, Mansfield Road, Oxford, U.K. OX1 3TA
| | - Heather C. Johnson
- Chemistry Research
Laboratories, Department of Chemistry, The University of Oxford, Mansfield Road, Oxford, U.K. OX1 3TA
| | - Laurel L. Schafer
- 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
| | - Andrew S. Weller
- Chemistry Research
Laboratories, Department of Chemistry, The University of Oxford, Mansfield Road, Oxford, U.K. OX1 3TA
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47
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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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48
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Bhunya S, Zimmerman PM, Paul A. Unraveling the Crucial Role of Metal-Free Catalysis in Borazine and Polyborazylene Formation in Transition-Metal-Catalyzed Ammonia–Borane Dehydrogenation. ACS Catal 2015. [DOI: 10.1021/cs502129m] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sourav Bhunya
- Raman
Centre for Atomic, Molecular and Optical Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India
| | - Paul M. Zimmerman
- Department
of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States
| | - Ankan Paul
- Raman
Centre for Atomic, Molecular and Optical Science, Indian Association for the Cultivation of Science, Kolkata 700 032, India
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49
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Malakar T, Bhunya S, Paul A. Theoretical Investigation on the Chemistry of Entrapment of the Elusive Aminoborane (H2NBH2) Molecule. Chemistry 2015; 21:6340-5. [DOI: 10.1002/chem.201405543] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Indexed: 11/08/2022]
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50
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Kalviri HA, Gärtner F, Ye G, Korobkov I, Baker RT. Probing the second dehydrogenation step in ammonia-borane dehydrocoupling: characterization and reactivity of the key intermediate, B-(cyclotriborazanyl)amine-borane. Chem Sci 2015; 6:618-624. [PMID: 28706630 PMCID: PMC5491959 DOI: 10.1039/c4sc02710h] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Accepted: 10/30/2014] [Indexed: 01/16/2023] Open
Abstract
While thermolysis of ammonia-borane (AB) affords a mixture of aminoborane- and iminoborane oligomers, the most selective metal-based catalysts afford exclusively cyclic iminoborane trimer (borazine) and its B-N cross-linked oligomers (polyborazylene). This catalysed dehydrogenation sequence proceeds through a branched cyclic aminoborane oligomer assigned previously as trimeric B-(cyclodiborazanyl)amine-borane (BCDB). Herein we utilize multinuclear NMR spectroscopy and X-ray crystallography to show instead that this key intermediate is actually tetrameric B-(cyclotriborazanyl)amine-borane (BCTB) and a method is presented for its selective synthesis from AB. The reactivity of BCTB upon thermal treatment as well as catalytic dehydrogenation is studied and discussed with regard to facilitating the second dehydrogenation step in AB dehydrocoupling.
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Affiliation(s)
- Hassan A Kalviri
- Department of Chemistry and Centre for Catalysis Research and Innovation (CCRI) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ; ; Tel: +1 613 5625698
| | - Felix Gärtner
- Department of Chemistry and Centre for Catalysis Research and Innovation (CCRI) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ; ; Tel: +1 613 5625698
- Leibniz-Institut für Katalyse (LIKAT) , Albert-Einstein Straβe 29a , 18059 Rostock , Germany
| | - Gang Ye
- Department of Chemistry and Centre for Catalysis Research and Innovation (CCRI) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ; ; Tel: +1 613 5625698
| | - Ilia Korobkov
- Department of Chemistry and Centre for Catalysis Research and Innovation (CCRI) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ; ; Tel: +1 613 5625698
| | - R Tom Baker
- Department of Chemistry and Centre for Catalysis Research and Innovation (CCRI) , University of Ottawa , 10 Marie Curie , Ottawa , Ontario K1N 6N5 , Canada . ; ; Tel: +1 613 5625698
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