Sulfur-Alkyne Cyclizations for Formation of Dihydrothiophenes and Annulated Thiophenes

Abstract
Cycloisomerization of homopropargylic thiols to dihydrothiophenes is promoted by group VI metal carbonyls. Related thiacyclization transformations under basic and radical conditions are also described, including regioselective formation of benzothiophenes from aryl methyl sulfides and alkynes.

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