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Homocoupling of phenylboronic acid using atomically dispersed gold on carbon catalysts: Catalyst evolution before reaction

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posted on 04.04.2018, 12:05 by Tanja E. Parmentier, Simon R. Dawson, Grazia Malta, Li Lu, Thomas E. Davies, Simon Kondrat, Simon J. Freakley, Christopher J. Kiely, Graham J. Hutchings
Coupling reactions to form new C-C bonds are extensively used in industrial synthetic processes. Gold has been shown to be an active catalyst for such reactions; however, conflicting reports exist as to whether cationic Au or metallic Au acts as the active species. We prepared a heterogeneous catalyst consisting of atomically dispersed Au-Cl x supported on carbon and showed this to be active in the homocoupling of phenylboronic acid to biphenyl. However; characterisation of the catalyst materials, even after just a short exposure time to the reactants, revealed rapid reduction and sintering of the Au species into larger metallic nanoparticles, which we propose to be the true active species in this instance. This study suggests that if cationic Au is an active catalyst, it must be stabilised against reduction and agglomeration by either forming complexes which are more stable than common chlorides or by strongly anchoring them firmly onto alternative support materials; as in this case the carbon supported Au-Cl species were easily reduced.

Funding

MaxNet Energy

History

School

  • Science

Department

  • Chemistry

Published in

ChemCatChem

Citation

PARMENTIER, T.E. ... et al, 2018. Homocoupling of phenylboronic acid using atomically dispersed gold on carbon catalysts: Catalyst evolution before reaction. ChemCatChem, 10(8), pp. 1853-1859.

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© Wiley

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2018

Notes

This is the peer reviewed version of the following article: PARMENTIER, T.E. ... et al, 2018. Homocoupling of phenylboronic acid using atomically dispersed gold on carbon catalysts: Catalyst evolution before reaction. ChemCatChem, 10(8), pp. 1853-1859, which has been published in final form at https://doi.org/10.1002/cctc.201701840. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

ISSN

1867-3880

eISSN

1867-3899

Language

en

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