Evaluating Thiourea Architecture for Intramolecular [2+2] Photocycloaddition of 4‐Alkenylcoumarins

Abstract

Abstract The efficiency of [2+2] photocycloadditions of 4‐alkenylcoumarins was evaluated with various thiourea skeletons to develop thiourea‐based catalysts for promoting photochemical reactions. Our results indicate that the excited state chemistry is dependent on the nature of the thiourea catalyst employed to activate the photoactive substrate. magnified image