Gold-Catalysed Heck Reaction: Fact or Fiction?

Budzelaar, Peter H. M., Bochmann, Manfred ORCID:, Landrini, Martina and Rocchigiani, Luca (2024) Gold-Catalysed Heck Reaction: Fact or Fiction?

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Two recent high-profile publications described the formation of Heck-type arylated alkenes catalysed by MeDalPhosAuCl / AgOTf (J. Am. Chem. Soc. 2023, 145, 8810) and their cyclisation to tetralines (Angew. Chem. Int. Ed. 2023, e202312786), claiming that these were the first demonstrations of alkene insertion into Au-aryl bonds, β-H elimination and chain-walking by Au-H cations under catalytic conditions. We show here that in fact this chemistry is a two-stage process. Only the first step, the production of an alkyl triflate ester as primary product by the well-known alkene heteroarylation sequence, involves gold. The subsequent formation of Heck-type olefins and their cyclisation to tetralines represent are classical H+-triggered carbocationic chemistry. These steps proceed in the absence of gold with identical results. Literature claims of new gold reactivity such as chain walking by the putative [LAuH]2+ dication have no basis in fact.

Item Type: Article
Uncontrolled Keywords: gold complexes,catalysis,mechanisms,heck reaction
Faculty \ School: Faculty of Science > School of Chemistry
UEA Research Groups: Faculty of Science > Research Groups > Chemistry of Light and Energy
Faculty of Science > Research Groups > Chemistry of Materials and Catalysis
Depositing User: LivePure Connector
Date Deposited: 17 Jan 2024 01:38
Last Modified: 17 Jan 2024 01:39
DOI: 10.26434/chemrxiv-2024-3rldf

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