A highly active bidentate magnesium catalyst for amine‐borane dehydrocoupling: kinetic and mechanistic studies

Ried, Alexander C. A., Taylor, Laurence J., Geer, Ana M., Williams, Huw E. L., Lewis, William, Blake, Alexander J. and Kays, Deborah L. ORCID: https://orcid.org/0000-0002-4616-6001 2019. A highly active bidentate magnesium catalyst for amine‐borane dehydrocoupling: kinetic and mechanistic studies. Chemistry - A European Journal 25 (27) , pp. 6840-6846. 10.1002/chem.201901197

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Abstract

A magnesium complex (1) featuring a bidentate aminopyridinato ligand is a remarkably selective catalyst for the dehydrocoupling of amine-boranes. This reaction proceeds to completion with low catalyst loadings (1 mol %) under mild conditions (60 °C), exceeding previously reported s-block systems in terms of selectivity, rate, and turnover number (TON). Mechanistic studies by in situ NMR analysis reveals the reaction to be first order in both catalyst and substrate. A reaction mechanism is proposed to account for these findings, with the high TON of the catalyst attributed to the bidentate nature of the ligand, which allows for reversible deprotonation of the substrate and regeneration of 1 as a stable resting state.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry
Publisher:	Wiley
ISSN:	0947-6539
Last Modified:	10 Jul 2024 10:00
URI:	https://orca.cardiff.ac.uk/id/eprint/170330

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