Reaction pathways for the cyclization of ortho-thioalkyl and ortho-thioaryl substituted phenyl radicals with alkynes. Reaction of o-methylthioarenediazonium tetrafluoroborates with alkynes to give 2-substituted benzo[b]thiophenes

Abstract

An easily effected aromatic annelation is described involving reaction of O-thioalkyl and O-thioaryl substituted Phenyl radicals with alkynes to give 2-substituted benzo[b]thiophenes; the mechanism is discussed.