Some Insights into the Gold-Catalysed A3-Coupling Reaction

Gregory A. Price, Alan Brisdon, Simon Randall, Edward Lewis, Daniel Whittaker, Robin Pritchard, Christopher Muryn, Kevin R Flower, Peter Quayle

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    Abstract

    A series of cyclometallated and functionalised NHC gold(I) and gold(III) complexes, many of which feature chiral ligands, and their application to A3-coupling reactions is presented. Gold(III) complexes were found to be particularly effective catalysts for the coupling in a range of solvents, however no asymmetric induction was obtained when using chiral gold complexes and the rate of product formation was found to be similar even when using different ligand systems. In-situ NMR analysis of these reactions indicates that decomposition of the catalyst occurs during the course of the reaction while TEM studies revealed the presence of gold nanoparticles in crude reaction mixtures. Taken together these data suggest that the gold nanoparticles, rather than the intact gold complexes, could be the catalytically active species, and if so this may have significant implications for other gold-catalysed systems.
    Original languageEnglish
    JournalJournal of Organometallic Chemistry
    Early online date21 Jun 2017
    DOIs
    Publication statusPublished - 2017

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