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Le Moigne L, Posenato T, Gajan D, Lesage de la Haye J, Raynaud J, Lacôte E. Catalyst-Free Transfer Hydrogenation from Amine-Borane Small Oligomers. Chemistry 2024; 30:e202300145. [PMID: 37814903 DOI: 10.1002/chem.202300145] [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: 01/16/2023] [Revised: 10/09/2023] [Accepted: 10/10/2023] [Indexed: 10/11/2023]
Abstract
Amine-borane dimers and oligomers with varied steric and electronic profiles were prepared via capping agent-controlled AA/BB polycondensations. They were used for transfer hydrogenations to aldehydes, ketones, imines as well as electron-poor alkene/alkyne moieties. The amine-borane Lewis-paired oligomers and the congested bis(amine-borane)s provided the highest yields. This was likely helped by facilitated dissociation (oligomers) or H-bond assistance. In the case of the oligomers, the second equivalent of H2 present was also engaged in the reaction. Solid-state NMR characterization provides evidence that the boron-containing materials obtained after transfer dehydrogenation are highly similar to those obtained from thermal dehydrogenation. The oligomers bridge the gap between simple amine-borane molecular reductants and the poly-amine-boranes and provide a full picture of the reactivity changes at the different scales.
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Affiliation(s)
- Louis Le Moigne
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, CNES, ArianeGroup, LHCEP, UMR 5278, Bât. Raulin, 2 rue Victor Grignard, 69622, Villeurbanne, France
| | - Tommaso Posenato
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, CPE Lyon, CP2 M -, UMR 5128, PolyCatMat, 43 Bd du 11 novembre 1918, 69616, Villeurbanne, France
| | - David Gajan
- Univ Lyon, CNRS, ENS de Lyon, Université Claude Bernard Lyon 1, Centre de RMN à Très Hauts Champs de Lyon, UMR5082, 5 Rue de la Doua, 69100, Villeurbanne, France
| | - Jennifer Lesage de la Haye
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, CNES, ArianeGroup, LHCEP, UMR 5278, Bât. Raulin, 2 rue Victor Grignard, 69622, Villeurbanne, France
| | - Jean Raynaud
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, CPE Lyon, CP2 M -, UMR 5128, PolyCatMat, 43 Bd du 11 novembre 1918, 69616, Villeurbanne, France
| | - Emmanuel Lacôte
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, CNES, ArianeGroup, LHCEP, UMR 5278, Bât. Raulin, 2 rue Victor Grignard, 69622, Villeurbanne, France
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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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Karacan YÖ, Karaboga S, Morkan İ. Cu
0
/TiO
2
Nanoparticles as Active Catalyst for H
2
Production from Dimethylamine Borane. ChemistrySelect 2021. [DOI: 10.1002/slct.202101405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Seda Karaboga
- Department of Chemistry Bolu Abant İzzet Baysal University 14280 Bolu Turkey
| | - İzzet Morkan
- Department of Chemistry Bolu Abant İzzet Baysal University 14280 Bolu Turkey
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Wang C, Astruc D. Recent developments of nanocatalyzed liquid-phase hydrogen generation. Chem Soc Rev 2021; 50:3437-3484. [PMID: 33492311 DOI: 10.1039/d0cs00515k] [Citation(s) in RCA: 78] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Hydrogen is the most effective and sustainable carrier of clean energy, and liquid-phase hydrogen storage materials with high hydrogen content, reversibility and good dehydrogenation kinetics are promising in view of "hydrogen economy". Efficient, low-cost, safe and selective hydrogen generation from chemical storage materials remains challenging, however. In this Review article, an overview of the recent achievements is provided, addressing the topic of nanocatalysis of hydrogen production from liquid-phase hydrogen storage materials including metal-boron hydrides, borane-nitrogen compounds, and liquid organic hydrides. The state-of-the-art catalysts range from high-performance nanocatalysts based on noble and non-noble metal nanoparticles (NPs) to emerging single-atom catalysts. Key aspects that are discussed include insights into the dehydrogenation mechanisms, regenerations from the spent liquid chemical hydrides, and tandem reactions using the in situ generated hydrogen. Finally, challenges, perspectives, and research directions for this area are envisaged.
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Affiliation(s)
- Changlong Wang
- Univ. Bordeaux, ISM, UMR CNRS 5255, 351 Cours de la Libération, 33405 Talence Cedex, France.
| | - Didier Astruc
- Univ. Bordeaux, ISM, UMR CNRS 5255, 351 Cours de la Libération, 33405 Talence Cedex, France.
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Faverio C, Boselli MF, Medici F, Benaglia M. Ammonia borane as a reducing agent in organic synthesis. Org Biomol Chem 2020; 18:7789-7813. [DOI: 10.1039/d0ob01351j] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Ammonia borane is gaining increasing attention as a sustainable and atom-economical winning reagent for the reduction of several substrates.
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Affiliation(s)
- Chiara Faverio
- Dipartimento di Chimica
- Università degli Studi di Milano
- 20133 Milano
- Italy
| | | | - Fabrizio Medici
- Dipartimento di Chimica
- Università degli Studi di Milano
- 20133 Milano
- Italy
| | - Maurizio Benaglia
- Dipartimento di Chimica
- Università degli Studi di Milano
- 20133 Milano
- Italy
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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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Carter TJ, Heiden ZM, Szymczak NK. Discovery of low energy pathways to metal-mediated B[double bond, length as m-dash]N bond reduction guided by computation and experiment. Chem Sci 2015; 6:7258-7266. [PMID: 28757986 PMCID: PMC5512141 DOI: 10.1039/c5sc02348c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Accepted: 09/24/2015] [Indexed: 01/09/2023] Open
Abstract
This manuscript describes a combination of DFT calculations and experiments to assess the reduction of borazines (B-N heterocycles) by η6-coordination to Cr(CO)3 or [Mn(CO)3]+ fragments. The energy requirements for borazine reduction are established as well as the extent to which coordination of borazine to a transition metal influences hydride affinity, basicity, and subsequent reduction steps at the coordinated borazine molecule. Borazine binding to M(CO)3 fragments decreases the thermodynamic hydricity by >30 kcal mol-1, allowing it to easily accept a hydride. These hydricity criteria were used to guide the selection of appropriate reagents for borazine dearomatization. Reduction was achieved with an H2-derived hydride source, and importantly, a pathway which proceeds through a single electron reduction and H-atom transfer reaction, mediated by anthraquinone was uncovered. The latter transformation was also carried out electrochemically, at relatively positive potentials by comparison to all prior reports, thus establishing an important proof of concept for any future electrochemical B[double bond, length as m-dash]N bond reduction.
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Affiliation(s)
- Tyler J Carter
- Department of Chemistry , University of Michigan , 930 N. University , Ann Arbor , MI 48109 , USA .
| | - Zachariah M Heiden
- Department of Chemistry , Washington State University , PO Box 644630 , Pullman , WA 99164 , USA .
| | - Nathaniel K Szymczak
- Department of Chemistry , University of Michigan , 930 N. University , Ann Arbor , MI 48109 , USA .
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