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H2 evolution from H2O via O–H oxidative addition across a 9,10-diboraanthracene

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Abstract

The water reactivity of the boroauride complex ([Au(B2P2)][K(18-c-6)]; (B2P2, 9,10-bis(2-(diisopropylphosphino)-phenyl)-9,10-dihydroboranthrene) and its corresponding two-electron oxidized complex, Au(B2P2)Cl, are presented. Au(B2P2)Cl is tolerant to H2O and forms the hydroxide complex Au(B2P2)OH in the presence of H2O and triethylamine. [Au(B2P2)]Cl and [Au(B2P2)]OH are poor Lewis acids as judged by the Gutmann–Becket method, with [Au(B2P2)]OH displaying facile hydroxide exchange between B atoms of the DBA ring as evidenced by variable temperature NMR spectroscopy. The reduced boroauride complex [Au(B2P2)] reacts with 1 equivalent of H2O to produce a hydride/hydroxide product, [Au(B2P2)(H)(OH)], that rapidly evolves H2 upon further H2O reaction to yield the dihydroxide compound, [Au(B2P2)(OH)2]. [Au(B2P2)]Cl can be regenerated from [Au(B2P2)(OH)2] via HCl·Et2O, providing a synthetic cycle for H2 evolution from H2O enabled by O–H oxidative addition at a diboraanthracene unit.

Graphical abstract: H2 evolution from H2O via O–H oxidative addition across a 9,10-diboraanthracene

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Supplementary files

Article information


Submitted
20 Aug 2020
Accepted
08 Oct 2020
First published
08 Oct 2020

Chem. Commun., 2020, Advance Article
Article type
Communication

H2 evolution from H2O via O–H oxidative addition across a 9,10-diboraanthracene

J. W. Taylor and W. H. Harman, Chem. Commun., 2020, Advance Article , DOI: 10.1039/D0CC05261B

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