Cesium-Catalyzed Regioselective Synthesis of Trisubstituted Heteroatom Alkenes: A New Strategy for the Preparation of Functional Alkenes.

A regio-, chemo-, and (Z)-stereoselective synthesis of vinylic dichalcogenides is developed using the CsOH-catalyzed three-component coupling of terminal alkynes, diaryl disulfides, and diaryl diselenides or tellurides.