1283850-69-0Relevant articles and documents
α,β-Unsaturated acyl azoliums from N-heterocyclic carbene catalyzed reactions: Observation and mechanistic investigation
Mahatthananchai, Jessada,Zheng, Pinguan,Bode, Jeffrey W.
, p. 1673 - 1677 (2011)
Caught in the act: Acyl azoliums have long been thought to be key reactive intermediates in N-heterocyclic carbene catalysis, but they have never been observed under catalytic conditions. Now, this has been successfully achieved by the characterization of α,β-unsaturated acyl azoliums (see scheme) using different spectroscopic techniques. Kinetic studies revealed the origin of their unexpected chemoselectivity in acylation and annulation reactions.