Photochemical eliminations involving zwitterionic intermediates generated via electrocyclic ring closure of benzothiophene carboxanilides
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Updated: Jun 4, 2026

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
Published on: November 29, 2018
Majher Sarker1, Tasnuva Shahrin, Mark G Steinmetz
1Department of Chemistry, Marquette University, Milwaukee, Wisconsin 53201-1881, USA.
Abstract:
Leaving groups such as carboxylate, thiolate, and phenolate are expelled via zwitterionic intermediates produced upon photochemical electrocyclic ring closure of benzothiophene carboxanilides in the triplet excited state. Chemical yields generally exceed 90%, while quantum yields vary with basicity of the released leaving group.
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