Abstract
The use of palladium–NHC (bulky) catalyst enables selective acylative coupling in esters via blocking the potential C(aryl)–O oxidative addition and decarbonylation processes. Mechanistic studies elucidate the role of bulky carbene catalysts in promoting C(acyl)–O activation, and as a result, the acyl metal intermediates undergo coupling without the loss of carbonyl group.
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