Electrochemical Synthesis of Thienoacene Derivatives: Transition-Metal-Free Dehydrogenative C-S Coupling Promoted by a Halogen Mediator.

The first electrochemical dehydrogenative C-S bond formation leading to thienoacene derivatives is described. Several thienoacene derivatives were synthesized by dehydrogenative C-H/S-H coupling. The addition of Bu NBr, which catalytically promoted the reaction as a halogen mediator, was essential.