1
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Cross MJ, Brodie CN, Crivoi DG, Goodall JC, Ryan DE, Martínez‐Martínez AJ, Johnson A, Weller AS. Dehydropolymerization of Amine-Boranes using Bis(imino)pyridine Rhodium Pre-Catalysis: σ-Amine-Borane Complexes, Nanoparticles, and Low Residual-Metal BN-Polymers that can be Chemically Repurposed. Chemistry 2023; 29:e202302110. [PMID: 37530441 PMCID: PMC10947130 DOI: 10.1002/chem.202302110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Revised: 07/31/2023] [Accepted: 08/02/2023] [Indexed: 08/03/2023]
Abstract
The sigma amine-borane complexes [Rh(L1)(η2 :η2 -H3 B⋅NRH2 )][OTf] (L1=2,6-bis-[1-(2,6-diisopropylphenylimino)ethyl]pyridine, R=Me, Et, n Pr) are described, alongside [Rh(L1)(NMeH2 )][OTf]. Using R=Me as a pre-catalyst (1 mol %) the dehydropolymerization of H3 B ⋅ NMeH2 gives [H2 BNMeH]n selectively. Added NMeH2 , or the direct use of [Rh(L1)(NMeH2 )][OTf], is required for initiation of catalysis, which is suggested to operate through the formation of a neutral hydride complex, Rh(L1)H. The formation of small (1-5 nm) nanoparticles is observed at the end of catalysis, but studies are ambiguous as to whether the catalysis is solely nanoparticle promoted or if there is a molecular homogeneous component. [Rh(L1)(NMeH2 )][OTf] is shown to operate at 0.025 mol % loadings on a 2 g scale of H3 B ⋅ NMeH2 to give polyaminoborane [H2 BNMeH]n [Mn =30,900 g/mol, Ð=1.8] that can be purified to a low residual [Rh] (6 μg/g). Addition of Na[N(SiMe3 )2 ] to [H2 BNMeH]n results in selective depolymerization to form the eee-isomer of N,N,N-trimethylcyclotriborazane [H2 BNMeH]3 : the chemical repurposing of a main-group polymer.
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Affiliation(s)
| | | | - Dana G. Crivoi
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
| | | | - David E. Ryan
- Department of ChemistryUniversity of YorkYorkYO10 5DDUK
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
| | - Antonio J. Martínez‐Martínez
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
- Supramolecular Organometallic and Main Group Chemistry Laboratory CIQSO-Center for Research in Sustainable Chemistry and Department of ChemistryUniversity of HuelvaCampus El Carmen21007HuelvaSpain
| | - Alice Johnson
- Department of ChemistryUniversity of OxfordOxfordOX1 3TAUK
- Department of Biosciences and ChemistrySheffield Hallam UniversityHoward StSheffieldS1 1WBUK
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2
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Ramachandran PV, Hamann HJ, Lin R, Singh A. Scalable, Green Synthesis of Heteroaromatic Amine-boranes. Org Process Res Dev 2023. [DOI: 10.1021/acs.oprd.3c00031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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3
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Pal S. Cp* non-innocence and the implications of (η 4-Cp*H)Rh intermediates in the hydrogenation of CO 2, NAD +, amino-borane, and the Cp* framework - a computational study. Dalton Trans 2023; 52:1182-1187. [PMID: 36648493 DOI: 10.1039/d2dt03611h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In hydrogenation mediated by half-sandwich complexes of Rh, Cp*Rh(III)-H intermediates are critical hydride-delivery agents. For bipyridine-supported complexes, a unique transformation named 'Cp* non-innocence' leads to the appearance of (Cp*H)Rh(I) intermediates, which are purported to exhibit enhanced hydride-delivery capabilities. In this work, DFT calculations performed to compare the role of these complexes in hydrogenation reveal that (Cp*H)Rh(I) intermediates do not compete with the conventional pathway (involving Cp*Rh(III)-H); instead they can lead to sequential hydrogenation of the Cp* framework, and potentially, catalyst degradation. Thus, caution is warranted when invoking the truly homogeneous nature of hydrogenation catalysis mediated by this popular class of complexes.
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Affiliation(s)
- Shrinwantu Pal
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology, 1919-1 Tancha, Onna-son, Okinawa, 904-0495, Japan.
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4
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Wiebe MA, Kundu S, LaPierre EA, Patrick BO, Manners I. Transition-Metal-Free Dehydropolymerization of Phosphine-Boranes at Ambient Temperature. Chemistry 2023; 29:e202202897. [PMID: 36196020 DOI: 10.1002/chem.202202897] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Indexed: 11/16/2022]
Abstract
Stoichiometric reaction of phosphine-borane adducts RR'PH⋅BH3 (R=Ph, R'=H, Ph, Et, and R=R'=t Bu) with the strong acid HNTf2 (Tf=SO2 CF3 ) leads to H2 elimination and the formation of the triflimido derivatives, RR'PH⋅BH2 (NTf2 ). Subsequent deprotonation by using bases, such as diisopropylethylamine or the carbene IPr (IPr=N,N'-bis(2,6-diisopropylphenyl)imidazol-2-ylidene), led to the formation of P-mono- or -disubstituted polyphosphinoboranes [RR'P-BH2 ]n . Evidence for the intermediacy of transient phosphinoborane monomers, RR'PBH2 , was provided by trapping reactions.
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Affiliation(s)
- Matthew A Wiebe
- Department of Chemistry, University of Victoria, 3800 Finnerty Rd, Victoria, British Columbia, V8P 5 C2, Canada
| | - Subrata Kundu
- Department of Chemistry, University of Victoria, 3800 Finnerty Rd, Victoria, British Columbia, V8P 5 C2, Canada.,Department of Chemistry, Indian Institute of Technology Delhi Hauz Khas, New Delhi, 110016, India
| | - Etienne A LaPierre
- Department of Chemistry, University of Victoria, 3800 Finnerty Rd, Victoria, British Columbia, V8P 5 C2, Canada
| | - Brian O Patrick
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, V6T 1Z1, Canada
| | - Ian Manners
- Department of Chemistry, University of Victoria, 3800 Finnerty Rd, Victoria, British Columbia, V8P 5 C2, Canada
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5
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Oldroyd NL, Chitnis SS, LaPierre EA, Annibale VT, Walsgrove HTG, Gates DP, Manners I. Ambient Temperature Carbene-Mediated Depolymerization: Stoichiometric and Catalytic Reactions of N-Heterocyclic- and Cyclic(Alkyl)Amino Carbenes with Poly( N-Methylaminoborane) [MeNH–BH 2] n. J Am Chem Soc 2022; 144:23179-23190. [DOI: 10.1021/jacs.2c10931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Nicola L. Oldroyd
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- Department of Chemistry, University of Victoria, Victoria BC V8W 3V6, Canada
| | - Saurabh S. Chitnis
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Etienne A. LaPierre
- Department of Chemistry, University of Victoria, Victoria BC V8W 3V6, Canada
| | - Vincent T. Annibale
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- Department of Chemistry, University of Victoria, Victoria BC V8W 3V6, Canada
| | - Henry T. G. Walsgrove
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Derek P. Gates
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Ian Manners
- Department of Chemistry, University of Victoria, Victoria BC V8W 3V6, Canada
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6
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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
![]()
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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7
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Zhai S, Forsyth C, Liu Z, Vidović D. Synthesis of Mono- and Acyclic Bis-aminoboranes via Controlled Hydroboration of Imines. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00283] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Siyuan Zhai
- School of Chemistry, Faculty of Sciences, Monash University, 3800 Clayton, Australia
| | - Craig Forsyth
- School of Chemistry, Faculty of Sciences, Monash University, 3800 Clayton, Australia
| | - Zhizhou Liu
- School of Chemistry, Faculty of Sciences, Monash University, 3800 Clayton, Australia
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
| | - Dragoslav Vidović
- School of Chemistry, Faculty of Sciences, Monash University, 3800 Clayton, Australia
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8
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Ramachandran PV, Hamann HJ, Mishra S. Aminoboranes via Tandem Iodination/Dehydroiodination for One-Pot Borylation. ACS OMEGA 2022; 7:14377-14389. [PMID: 35573212 PMCID: PMC9089688 DOI: 10.1021/acsomega.2c01461] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Accepted: 03/31/2022] [Indexed: 06/15/2023]
Abstract
A rapid synthesis of aminoboranes from amine-boranes utilizing an iodination/dehydroiodination sequence is described. Monomeric aminoboranes are generated exclusively from several substrate adducts, following an E2-type elimination, with the added base playing a critical role in monomer vs dimer formation. Diisopropylaminoborane formed using this methodology has been applied to a one-pot palladium-catalyzed conversion of iodo- and bromoarenes to the corresponding boronates. Additionally, modification of the workup allows for isolation of the boronic acid and recovery of the utilized amine.
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Affiliation(s)
| | - Henry J. Hamann
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United
States
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9
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Kuehn L, Zapf L, Werner L, Stang M, Würtemberger-Pietsch S, Krummenacher I, Braunschweig H, Lacôte E, Marder TB, Radius U. NHC induced radical formation via homolytic cleavage of B–B bonds and its role in organic reactions. Chem Sci 2022; 13:8321-8333. [PMID: 35919710 PMCID: PMC9297536 DOI: 10.1039/d2sc02096c] [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: 04/12/2022] [Accepted: 06/07/2022] [Indexed: 11/21/2022] Open
Abstract
New borylation methodologies have been reported recently, wherein diboron(4) compounds apparently participate in free radical couplings via the homolytic cleavage of the B–B bond. We report herein that bis-NHC adducts of the type (NHC)2·B2(OR)4, which are thermally unstable and undergo intramolecular ring expansion reactions (RER), are sources of boryl radicals of the type NHC–BR2˙, exemplified by Me2ImMe·Bneop˙ 1a (Me2ImMe = 1,3,4,5-tetramethyl-imidazolin-2-ylidene, neop = neopentylglycolato), which are formed by homolytic B–B bond cleavage. Attempts to apply the boryl moiety 1a in a metal-free borylation reaction by suppressing the RER failed. However, based on these findings, a protocol was developed using Me2ImMe·B2pin23 for the transition metal- and additive-free boryl transfer to substituted aryl iodides and bromides giving aryl boronate esters in good yields. Analysis of the side products and further studies concerning the reaction mechanism revealed that radicals are likely involved. An aryl radical was trapped by TEMPO, an EPR resonance, which was suggestive of a boron-based radical, was detected in situ, and running the reaction in styrene led to the formation of polystyrene. The isolation of a boronium cation side product, [(Me2ImMe)2·Bpin]+I−7, demonstrated the fate of the second boryl moiety of B2pin2. Interestingly, Me2ImMe NHC reacts with aryl iodides and bromides generating radicals. A mechanism for the boryl radical transfer from Me2ImMe·B2pin23 to aryl iodides and bromides is proposed based on these experimental observations. Bis-NHC adducts of the type (NHC)2·B2(OR)4 are sources of boryl radicals of the type NHC–BR2˙, which are formed by homolytic B–B bond cleavage.![]()
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Affiliation(s)
- Laura Kuehn
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Ludwig Zapf
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Luis Werner
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Martin Stang
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Sabrina Würtemberger-Pietsch
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Emmanuel Lacôte
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, CNES, ArianeGroup, LHCEP, Bât. Raulin, 2 rue Victor Grignard, F-69622 Villeurbanne, France
| | - Todd B. Marder
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Udo Radius
- Institute for Inorganic Chemistry, Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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10
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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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11
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Borthakur R, Chandrasekhar V. Boron-heteroelement (B–E; E = Al, C, Si, Ge, N, P, As, Bi, O, S, Se, Te) multiply bonded compounds: Recent advances. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213647] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Devillard M, De Albuquerque Pinheiro CA, Caytan E, Roiland C, Dinoi C, Del Rosal I, Alcaraz G. Uncatalyzed Formation of Polyaminoboranes from Diisopropylaminoborane and Primary Amines: a Kinetically Controlled Polymerization Reaction. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001458] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Marc Devillard
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes) 35000 Rennes France
| | | | - Elsa Caytan
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes) 35000 Rennes France
| | - Claire Roiland
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes) 35000 Rennes France
| | - Chiara Dinoi
- LPCNO CNRS & INSA Universitć de Toulouse 135 avenue de Rangueil 31077 Toulouse France
| | - Iker Del Rosal
- LPCNO CNRS & INSA Universitć de Toulouse 135 avenue de Rangueil 31077 Toulouse France
| | - Gilles Alcaraz
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes) 35000 Rennes France
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13
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Li H, Li Y, Kang J, Fan L, Yang Q, Li S, Rahman A, Chen D. Reactivity and mechanisms of hydridic hydrogen of B–H in ammonia borane towards acetic acids: the ammonia B-monoacyloxy boranes. NEW J CHEM 2021. [DOI: 10.1039/d1nj01727f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
B-monoacyloxy boranes are first obtained by moderate reactions of ammonia borane with acetic acids.
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Affiliation(s)
- Huizhen Li
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
| | - Yunhui Li
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
| | - Jiaxin Kang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Lin Fan
- Beijing Normal University Publishing Group
- College of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Qiuyu Yang
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Shujun Li
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Abdul Rahman
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou 510006
- P. R. China
| | - Daqi Chen
- School of Mechanical and Electrical Engineering
- Guangzhou University
- Guangzhou
- P. R. China
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14
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Hasche P, Haak J, Anke F, Kubis C, Baumann W, Drexler HJ, Jiao H, Beweries T. Dehydropolymerisation of methylamine borane using highly active rhodium(iii) bis(thiophosphinite) pincer complexes: catalytic and mechanistic insights. Catal Sci Technol 2021. [DOI: 10.1039/d1cy00124h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The bis(thiophosphinite) pincer complexes [(RPSCSPR)Rh(py)(H)(Cl)] (RPSCSPR = C6H4–2,6-(SPR2)2 with R = iPr, 2a and R = Ph, 2b) are highly active precatalysts for the dehydropolymerisation of methylamine borane.
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Affiliation(s)
- Patrick Hasche
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | - Julia Haak
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | - Felix Anke
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | - Christoph Kubis
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
| | | | | | - Haijun Jiao
- Leibniz-Institut für Katalyse e.V. (LIKAT)
- 18059 Rostock
- Germany
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15
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Wang J, Ju MY, Chen XM, Chen X. A general method for the synthesis of covalent and ionic amine borane complexes containing trinitromethyl fragments. RSC Adv 2021; 11:9740-9745. [PMID: 35423463 PMCID: PMC8695509 DOI: 10.1039/d1ra00440a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 02/24/2021] [Indexed: 12/24/2022] Open
Abstract
A general approach for the synthesis of covalent and ionic amine borane complexes containing trinitromethyl fragments has been developed through metathesis reactions between amine chloroborane complexes and potassium salt of trinitromethyl (K[C(NO2)3]). Five covalent and ionic trinitromethyl amine borane complexes have been synthesized in good yields with high purity and it is found that the ionic complex, [H2B(NH3)2][C(NO2)3], might be a promising energetic material on the basis of the investigation of its thermal decomposition behaviour. A general approach has been developed through which five covalent and ionic amine borane complexes containing trinitromethyl fragments were synthesized.![]()
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Affiliation(s)
- Jin Wang
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- Henan Normal University
- Xinxiang
- China
| | - Ming-Yue Ju
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- Henan Normal University
- Xinxiang
- China
| | - Xi-Meng Chen
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- Henan Normal University
- Xinxiang
- China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials
- Henan Normal University
- Xinxiang
- China
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16
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Spielvogel KD, Luna JA, Loria SM, Weisburn LP, Stumme NC, Ringenberg MR, Durgaprasad G, Keith JM, Shaw SK, Daly SR. Influence of Multisite Metal-Ligand Cooperativity on the Redox Activity of Noninnocent N 2S 2 Ligands. Inorg Chem 2020; 59:10845-10853. [PMID: 32639726 DOI: 10.1021/acs.inorgchem.0c01353] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Metal-ligand cooperativity (MLC) relies on chemically reactive ligands to assist metals with small-molecule binding and activation, and it has facilitated unprecedented examples of catalysis with metal complexes. Despite growing interest in combining ligand-centered chemical and redox reactions for chemical transformations, there are few studies demonstrating how chemically engaging redox active ligands in MLC affects their electrochemical properties when bound to metals. Here we report stepwise changes in the redox activity of model Ru complexes as zero, one, and two BH3 molecules undergo MLC binding with a triaryl noninnocent N2S2 ligand derived from o-phenylenediamine (L1). A similar series of Ru complexes with a diaryl N2S2 ligand with ethylene substituted in place of phenylene (L2) is also described to evaluate the influence of the o-phenylenediamine subunit on redox activity and MLC. Cyclic voltammetry (CV) studies and density functional theory (DFT) calculations show that MLC attenuates ligand-centered redox activity in both series of complexes, but electron transfer is still achieved when only one of the two redox-active sites on the ligands is chemically engaged. The results demonstrate how incorporating more than one multifunctional reactive site could be an effective strategy for maintaining redox noninnocence in ligands that are also chemically reactive and competent for MLC.
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Affiliation(s)
- Kyle D Spielvogel
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Javier A Luna
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Sydney M Loria
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Leah P Weisburn
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Nathan C Stumme
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Mark R Ringenberg
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Gummadi Durgaprasad
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Jason M Keith
- Department of Chemistry, Colgate University, 13 Oak Drive, Hamilton, New York 13346, United States
| | - Scott K Shaw
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
| | - Scott R Daly
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, United States
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17
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Anke F, Boye S, Spannenberg A, Lederer A, Heller D, Beweries T. Dehydropolymerisation of Methylamine Borane and an N-Substituted Primary Amine Borane Using a PNP Fe Catalyst. Chemistry 2020; 26:7889-7899. [PMID: 32118328 PMCID: PMC7383739 DOI: 10.1002/chem.202000809] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Indexed: 01/30/2023]
Abstract
Dehydropolymerisation of methylamine borane (H3 B⋅NMeH2 ) using the well-known iron amido complex [(PNP)Fe(H)(CO)] (PNP=N(CH2 CH2 PiPr2 )2 ) (1) gives poly(aminoborane)s by a chain-growth mechanism. In toluene, rapid dehydrogenation of H3 B⋅NMeH2 following first-order behaviour as a limiting case of a more general underlying Michaelis-Menten kinetics is observed, forming aminoborane H2 B=NMeH, which selectively couples to give high-molecular-weight poly(aminoborane)s (H2 BNMeH)n and only traces of borazine (HBNMe)3 by depolymerisation after full conversion. Based on a series of comparative experiments using structurally related Fe catalysts and dimethylamine borane (H3 B⋅NMe2 H) polymer formation is proposed to occur by nucleophilic chain growth as reported earlier computationally and experimentally. A silyl functionalised primary borane H3 B⋅N(CH2 SiMe3 )H2 was studied in homo- and co-dehydropolymerisation reactions to give the first examples for Si containing poly(aminoborane)s.
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Affiliation(s)
- Felix Anke
- Leibniz-Institut für Katalyse e.V.Albert-Einstein-Str. 29a18059RostockGermany
| | - Susanne Boye
- Leibniz-Institut für Polymerforschung DresdenHohe Str. 601069DresdenGermany
| | - Anke Spannenberg
- Leibniz-Institut für Katalyse e.V.Albert-Einstein-Str. 29a18059RostockGermany
| | - Albena Lederer
- Leibniz-Institut für Polymerforschung DresdenHohe Str. 601069DresdenGermany
- Technische Universität Dresden01062DresdenGermany
| | - Detlef Heller
- Leibniz-Institut für Katalyse e.V.Albert-Einstein-Str. 29a18059RostockGermany
| | - Torsten Beweries
- Leibniz-Institut für Katalyse e.V.Albert-Einstein-Str. 29a18059RostockGermany
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18
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Ryan DE, Andrea KA, Race JJ, Boyd TM, Lloyd-Jones GC, Weller AS. Amine–Borane Dehydropolymerization Using Rh-Based Precatalysts: Resting State, Chain Control, and Efficient Polymer Synthesis. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02211] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- David E. Ryan
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
- Department of Chemistry, Chemical Research Laboratories, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Kori A. Andrea
- Department of Chemistry, Memorial University of Newfoundland, St. John’s, Newfoundland A1B 3X7, Canada
| | - James J. Race
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
- Department of Chemistry, Chemical Research Laboratories, University of Oxford, Oxford OX1 3TA, United Kingdom
| | - Timothy M. Boyd
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
- Department of Chemistry, Chemical Research Laboratories, 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
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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19
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Weinhart MAK, Lisovenko AS, Timoshkin AY, Scheer M. Nur durch eine Lewis‐Base stabilisierte Phosphanylalane und ‐gallane. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914046] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Anna S. Lisovenko
- Institut für Chemie Staatliche Universität St. Petersburg Universitetskaya emb. 7/9 199034 St. Petersburg Russland
| | - Alexey Y. Timoshkin
- Institut für Chemie Staatliche Universität St. Petersburg Universitetskaya emb. 7/9 199034 St. Petersburg Russland
| | - Manfred Scheer
- Institut für Anorganische Chemie Universität Regensburg 93040 Regensburg Deutschland
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20
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Weinhart MAK, Lisovenko AS, Timoshkin AY, Scheer M. Phosphanylalanes and Phosphanylgallanes Stabilized only by a Lewis Base. Angew Chem Int Ed Engl 2020; 59:5541-5545. [PMID: 31815355 PMCID: PMC7155101 DOI: 10.1002/anie.201914046] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Indexed: 11/23/2022]
Abstract
The synthesis and characterization of the first parent phosphanylalane and phosphanylgallane stabilized only by a Lewis base (LB) are reported. The corresponding substituted compounds, such as IDipp⋅GaH2 PCy2 (1) (IDipp=1,3-bis(2,6-diisopropylphenyl)-imidazolin-2-ylidene) were obtained by the reaction of LiPCy2 with IDipp⋅GaH2 Cl. However, the LB-stabilized parent compounds IDipp⋅GaH2 PH2 (3) and IDipp⋅AlH2 PH2 (4) were prepared via a salt metathesis of LiPH2 ⋅DME with IDipp⋅E'H2 Cl (E'=Ga, Al) or by H2 -elimination reactions of IDipp⋅E'H3 (E'=Ga, Al) and PH3 , respectively. The compounds could be isolated as crystalline solids and completely characterized. Supporting DFT computations gave insight into the reaction pathways as well as into the stability of these compounds with respect to their decomposition behavior.
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Affiliation(s)
| | - Anna S. Lisovenko
- Institute of ChemistrySaint Petersburg State UniversityUniversitetskaya emb. 7/9199034St. PetersburgRussia
| | - Alexey Y. Timoshkin
- Institute of ChemistrySaint Petersburg State UniversityUniversitetskaya emb. 7/9199034St. PetersburgRussia
| | - Manfred Scheer
- Institut für Anorganische ChemieUniversität Regensburg93040RegensburgGermany
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21
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Boyd TM, Andrea KA, Baston K, Johnson A, Ryan DE, Weller AS. A simple cobalt-based catalyst system for the controlled dehydropolymerisation of H3B·NMeH2 on the gram-scale. Chem Commun (Camb) 2020; 56:482-485. [DOI: 10.1039/c9cc08864d] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A simple Co-based catalyst system promotes the efficient and controlled dehydropolymerisation of amine–boranes on scale.
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Affiliation(s)
- Timothy M. Boyd
- Department of Chemistry
- Chemistry Research Laboratories
- University of Oxford
- Oxford
- UK
| | - Kori A. Andrea
- Department of Chemistry
- Chemistry Research Laboratories
- University of Oxford
- Oxford
- UK
| | - Katherine Baston
- Department of Chemistry
- Chemistry Research Laboratories
- University of Oxford
- Oxford
- UK
| | - Alice Johnson
- Department of Chemistry
- Chemistry Research Laboratories
- University of Oxford
- Oxford
- UK
| | - David E. Ryan
- Department of Chemistry
- Chemistry Research Laboratories
- University of Oxford
- Oxford
- UK
| | - Andrew S. Weller
- Department of Chemistry
- Chemistry Research Laboratories
- University of Oxford
- Oxford
- UK
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22
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LaPierre EA, Patrick BO, Manners I. Trivalent Titanocene Alkyls and Hydrides as Well-Defined, Highly Active, and Broad Scope Precatalysts for Dehydropolymerization of Amine-Boranes. J Am Chem Soc 2019; 141:20009-20015. [DOI: 10.1021/jacs.9b11112] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Etienne A. LaPierre
- Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
| | - Ian Manners
- Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada
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23
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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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24
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Resendiz-Lara DA, Whittell GR, Leitao EM, Manners I. Catalytic Synthesis, Characterization, and Properties of Polyaminoborane Homopolymers and Random Copolymers. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01139] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | - George R. Whittell
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | - Erin M. Leitao
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
| | - Ian Manners
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol, BS8 1TS, U.K
- Department of Chemistry, University of Victoria, Victoria, BC V8W 3V6, Canada
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25
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Zhdanov AP, Voinova VV, Klyukin IN, Kubasov AS, Zhizhin KY, Kuznetsov NT. New Synthesis Method of N-Monosubstituted Ammonium-closo-Decaborates. J CLUST SCI 2019. [DOI: 10.1007/s10876-019-01628-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Boom DHA, Jupp AR, Slootweg JC. Dehydrogenation of Amine-Boranes Using p-Block Compounds. Chemistry 2019; 25:9133-9152. [PMID: 30964220 PMCID: PMC6771515 DOI: 10.1002/chem.201900679] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Indexed: 01/11/2023]
Abstract
Amine-boranes have gained a lot of attention due to their potential as hydrogen storage materials and their capacity to act as precursors for transfer hydrogenation. Therefore, a lot of effort has gone into the development of suitable transition- and main-group metal catalysts for the dehydrogenation of amine-boranes. During the past decade, new systems started to emerge solely based on p-block elements that promote the dehydrogenation of amine-boranes through hydrogen-transfer reactions, polymerization initiation, and main-group catalysis. In this review, we highlight the development of these p-block based systems for stoichiometric and catalytic amine-borane dehydrogenation and discuss the underlying mechanisms.
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Affiliation(s)
- Devin H. A. Boom
- Van 't Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041090 GDAmsterdamThe Netherlands
| | - Andrew R. Jupp
- Van 't Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041090 GDAmsterdamThe Netherlands
| | - J. Chris Slootweg
- Van 't Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041090 GDAmsterdamThe Netherlands
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27
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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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28
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Oldroyd NL, Chitnis SS, Annibale VT, Arz MI, Sparkes HA, Manners I. Metal-free dehydropolymerisation of phosphine-boranes using cyclic (alkyl)(amino)carbenes as hydrogen acceptors. Nat Commun 2019; 10:1370. [PMID: 30914640 PMCID: PMC6435733 DOI: 10.1038/s41467-019-08967-8] [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: 10/02/2018] [Accepted: 02/05/2019] [Indexed: 11/08/2022] Open
Abstract
The divalent carbene carbon centre in cyclic (alkyl)(amino)carbenes (CAACs) is known to exhibit transition-metal-like insertion into E-H σ-bonds (E = H, N, Si, B, P, C, O) with formation of new, strong C-E and C-H bonds. Although subsequent transformations of the products represent an attractive strategy for metal-free synthesis, few examples have been reported. Herein we describe the dehydrogenation of phosphine-boranes, RR'PH·BH3, using a CAAC, which behaves as a stoichiometric hydrogen acceptor to release monomeric phosphinoboranes, [RR'PBH2], under mild conditions. The latter species are transient intermediates that either polymerise to the corresponding polyphosphinoboranes, [RR'PBH2]n (R = Ph; R' = H, Ph or Et), or are trapped in the form of CAAC-phosphinoborane adducts, CAAC·H2BPRR' (R = R' = tBu; R = R' = Mes). In contrast to previously established methods such as transition metal-catalysed dehydrocoupling, which only yield P-monosubstituted polymers, [RHPBH2]n, the CAAC-mediated route also provides access to P-disubstituted polymers, [RR'PBH2]n (R = Ph; R' = Ph or Et).
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Affiliation(s)
- Nicola L Oldroyd
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Saurabh S Chitnis
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. 15000, Halifax, NS, B3H 4R2, Canada
| | - Vincent T Annibale
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Marius I Arz
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Hazel A Sparkes
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Ian Manners
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
- Department of Chemistry, University of Victoria, Victoria, BC, V8W 3V6, Canada.
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29
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Vidal F, Jäkle F. Functional Polymeric Materials Based on Main‐Group Elements. Angew Chem Int Ed Engl 2019; 58:5846-5870. [DOI: 10.1002/anie.201810611] [Citation(s) in RCA: 129] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Indexed: 12/11/2022]
Affiliation(s)
- Fernando Vidal
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
| | - Frieder Jäkle
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
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30
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Vidal F, Jäkle F. Funktionelle polymere Materialien auf der Basis von Hauptgruppen‐Elementen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201810611] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Fernando Vidal
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
| | - Frieder Jäkle
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
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31
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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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32
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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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33
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Farhadpour B, Guo J, Hairsine DW, Gilroy JB, Baines KM. On the primary structure of polysilenes and polygermenes. Polym Chem 2019. [DOI: 10.1039/c9py00781d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Materials derived from the anionic polymerization of a silene or a germene have a regular, alternating structure without any significant rearrangement taking place during polymerization.
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Affiliation(s)
- Bahareh Farhadpour
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research (CAMBR)
- University of Western Ontario
- London
- Canada
| | - Jiacheng Guo
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research (CAMBR)
- University of Western Ontario
- London
- Canada
| | - Douglas W. Hairsine
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research (CAMBR)
- University of Western Ontario
- London
- Canada
| | - Joe B. Gilroy
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research (CAMBR)
- University of Western Ontario
- London
- Canada
| | - Kim M. Baines
- Department of Chemistry and Centre for Advanced Materials and Biomaterials Research (CAMBR)
- University of Western Ontario
- London
- Canada
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34
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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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35
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Jurca T, Dellermann T, Stubbs NE, Resendiz-Lara DA, Whittell GR, Manners I. Step-growth titanium-catalysed dehydropolymerisation of amine-boranes. Chem Sci 2018; 9:3360-3366. [PMID: 29780466 PMCID: PMC5933219 DOI: 10.1039/c7sc05395a] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 02/05/2018] [Indexed: 11/21/2022] Open
Abstract
Precatalysts active for the dehydropolymerisation of primary amine-boranes are generally based on mid or late transition metal. We have found that the activity of the precatalyst system formed from CpR2TiCl2 and 2nBuLi towards the dehydrogenation of the secondary amine-borane Me2NH·BH3, to yield the cyclic diborazane [Me2N-BH2]2, increases dramatically with increasing electron-donating character of the cyclopentadienyl rings (CpR). Application of the most active precatalyst system (CpR = η-C5Me5) to the primary amine-borane MeNH2·BH3 enabled the first synthesis of high molar mass poly(N-methylaminoborane), [MeNH-BH2] n , the BN analogue of polypropylene, by an early transition metal such as catalyst. Significantly, unlike other dehydropolymerization precatalysts for MeNH2·BH3 such as [Ir(POCOP)H2], skeletal nickel, and [Rh(COD)Cl]2, the Ti precatalyst system was also active towards a range of substrates including BzNH2·BH3 (Bz = benzyl) yielding high molar mass polymer. Moreover, in contrast to the late transition metal catalysed dehydropolymerisation of MeNH2·BH3 and also the Ziegler-Natta polymerisation of olefins, studies indicate that the Ti-catalyzed dehydropolymerization reactions proceed by a step-growth rather than a chain-growth mechanism.
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Affiliation(s)
- Titel Jurca
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK .
| | - Theresa Dellermann
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK .
| | - Naomi E Stubbs
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK .
| | - Diego A Resendiz-Lara
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK .
| | - George R Whittell
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK .
| | - Ian Manners
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK .
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36
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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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37
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De Albuquerque Pinheiro CA, Roiland C, Jehan P, Alcaraz G. Solventless and Metal-Free Synthesis of High-Molecular-Mass Polyaminoboranes from Diisopropylaminoborane and Primary Amines. Angew Chem Int Ed Engl 2018; 57:1519-1522. [DOI: 10.1002/anie.201710293] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Indexed: 11/10/2022]
Affiliation(s)
| | - Claire Roiland
- Institut des Sciences Chimiques de Rennes (ISCR), UMR-CNRS 6226; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Philippe Jehan
- ScanMAT-CRMPO, UMS-CNRS 2001; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Gilles Alcaraz
- Institut des Sciences Chimiques de Rennes (ISCR), UMR-CNRS 6226; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
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38
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De Albuquerque Pinheiro CA, Roiland C, Jehan P, Alcaraz G. Solventless and Metal-Free Synthesis of High-Molecular-Mass Polyaminoboranes from Diisopropylaminoborane and Primary Amines. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201710293] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Claire Roiland
- Institut des Sciences Chimiques de Rennes (ISCR), UMR-CNRS 6226; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Philippe Jehan
- ScanMAT-CRMPO, UMS-CNRS 2001; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
| | - Gilles Alcaraz
- Institut des Sciences Chimiques de Rennes (ISCR), UMR-CNRS 6226; Université de Rennes 1; 263 avenue du Général Leclerc 35042 Rennes cedex France
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39
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Barman S, Remhof A, Koitz R, Iannuzzi M, Blacque O, Yan Y, Fox T, Hutter J, Züttel A, Berke H. Post-Synthesis Amine Borane Functionalization of a Metal-Organic Framework and Its Unusual Chemical Hydrogen Release Phenomenon. Chemistry 2017; 23:8823-8828. [DOI: 10.1002/chem.201702013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Samir Barman
- Chemisches Institut; Universität Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
- Present address: Physical Sciences and Engineering; KAUST Catalysis Center; King Abdullah University of Science and Technology (KAUST); Thuwal 23955-6900 Saudi Arabia
| | - Arndt Remhof
- Empa, Materials Sciences and Technology Department of Mobility; Environment and Energy Division “Hydrogen and Energy''; Überlandstrasse 129 8600 Dübendorf Switzerland
| | - Ralph Koitz
- Chemisches Institut; Universität Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Marcella Iannuzzi
- Chemisches Institut; Universität Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Olivier Blacque
- Chemisches Institut; Universität Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Yigang Yan
- Empa, Materials Sciences and Technology Department of Mobility; Environment and Energy Division “Hydrogen and Energy''; Überlandstrasse 129 8600 Dübendorf Switzerland
- Present address: Interdisciplinary Nanoscience Center (iNANO); Aarhus University; 8000 Aarhus C Denmark
| | - Thomas Fox
- Chemisches Institut; Universität Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Jürg Hutter
- Chemisches Institut; Universität Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
| | - Andreas Züttel
- Empa, Materials Sciences and Technology Department of Mobility; Environment and Energy Division “Hydrogen and Energy''; Überlandstrasse 129 8600 Dübendorf Switzerland
- Present address: EPFL Valais Wallis; EPFL SB ISIC LMER; Rue de l'Industrie 17 1951 Sion Switzerland
| | - Heinz Berke
- Chemisches Institut; Universität Zurich; Winterthurerstrasse 190 8057 Zurich Switzerland
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40
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Gillon BH, Gates DP, Henderson MA, Janusson E, McIndoe JS. Mass spectrometric characterization of oligomeric phosphaalkenes. CAN J CHEM 2017. [DOI: 10.1139/cjc-2016-0206] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Oligomeric phosphaalkenes are readily characterized using electrospray ionization mass spectrometry (ESI-MS). The high affinity of phosphines for silver ions permits the detection of the unadulterated polymer as [M + xAg]x+ions (x = 2–3). When the oligomers are oxidized using H2O2, the resulting phosphine oxide polymer may be treated with sodium ions to produce [M + xNa]x+ions (x = 2–3). Both methods predict a similar distribution of oligomers: Mnvalues of 3450 ± 100 Da and a PDI of 1.09 ± 0.01 cover both analyses. This distribution represents oligomers of the general formula Me(PMesCPh2)nH from n = 4–20, maximizing at ∼n = 10.
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Affiliation(s)
- Bronwyn H. Gillon
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Derek P. Gates
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
| | - Matthew A. Henderson
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC V8W 3V6, Canada
| | - Eric Janusson
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC V8W 3V6, Canada
| | - J. Scott McIndoe
- Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC V8W 3V6, Canada
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41
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Anke F, Han D, Klahn M, Spannenberg A, Beweries T. Formation of high-molecular weight polyaminoborane by Fe hydride catalysed dehydrocoupling of methylamine borane. Dalton Trans 2017; 46:6843-6847. [DOI: 10.1039/c7dt01487b] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The complex [(PNHP)Fe(H)(CO)(HBH3)] (PNHP = HN(CH2CH2Pi-Pr2)2) serves as a catalyst precursor for the selective dehydrocoupling of methylamine borane at room temperature, tentatively via an off-metal polymerisation pathway.
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Affiliation(s)
- F. Anke
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - D. Han
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - M. Klahn
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - A. Spannenberg
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
| | - T. Beweries
- Leibniz-Institut für Katalyse an der Universität Rostock e.V
- 18059 Rostock
- Germany
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42
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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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43
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Metters OJ, Flynn SR, Dowds CK, Sparkes HA, Manners I, Wass DF. Catalytic Dehydrocoupling of Amine–Boranes using Cationic Zirconium(IV)–Phosphine Frustrated Lewis Pairs. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02211] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Owen J. Metters
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Stephanie R. Flynn
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Christiana K. Dowds
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Hazel A. Sparkes
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Ian Manners
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Duncan F. Wass
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
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44
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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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45
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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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46
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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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47
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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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48
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Devillard M, Mallet-Ladeira S, Bouhadir G, Bourissou D. Diverse reactivity of borenium cations with >N–H compounds. Chem Commun (Camb) 2016; 52:8877-80. [DOI: 10.1039/c6cc03183h] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The P-stabilized borenium 1 displays rich reactivity towards >N–H compounds: substitution reaction at a borenium center with Ph2NH, Lewis adduct formation and subsequent deprotonation with NH3, B–Mes cleavage and formation of a dicationic species with HNTf2.
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Affiliation(s)
| | - Sonia Mallet-Ladeira
- Université Paul Sabatier
- Institut de Chimie de Toulouse (FR 2599)
- 31062 Toulouse cedex 9
- France
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49
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Less RJ, García-Rodríguez R, Simmonds HR, Allen LK, Bond AD, Wright DS. Use of crown ethers to isolate intermediates in ammonia-borane dehydrocoupling reactions. Chem Commun (Camb) 2016; 52:3650-2. [DOI: 10.1039/c6cc00088f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The presence of 18-crown-6 in the Lewis acid-promoted dehydrocoupling reaction of ammonia borane permits isolation of [(THF)BH2NH3]+ cation.
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50
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Abstract
A survey of the state-of-the-art in the development of synthetic methods to incorporate p-block elements into polymers is given. The incorporation of main group elements (groups 13-16) into long chains provides access to materials with fascinating chemical and physical properties imparted by the presence of inorganic groups. Perhaps the greatest impedance to the widespread academic and commercial use of p-block element-containing macromolecules is the synthetic challenge associated with linking inorganic elements into long chains. In recent years, creative methodologies have been developed to incorporate heteroatoms into polymeric structures, with perhaps the greatest advances occurring with hybrid organic-inorganic polymers composed of boron, silicon, phosphorus and sulfur. With these developments, materials are currently being realized that possess exciting chemical, photophysical and thermal properties that are not possible for conventional organic polymers. This review focuses on highlighting the most significant recent advances whilst giving an appropriate background for the general reader. Of particular focus will be advances made over the last two decades, with emphasis on the novel synthetic methodologies employed.
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Affiliation(s)
- Andrew M Priegert
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouer, British Columbia, CanadaV6T 1Z1.
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