Diquat Based Dyes: A New Class of Photoredox Catalysts and Their Use in Aerobic Thiocyanation
Armin Meier, Sabuhi Badalov, Timur Biktagirov, W. G. Schmidt, René Wilhelm
Abstract
A series of new organic donor-π-acceptor dyes incorporating a diquat moiety as a novel electron-acceptor unit have been synthesized and characterized. The analytical data were supported by DFT calculations. These dyes were explored in the aerobic thiocyanation of indoles and pyrroles. Here they showed a high photocatalytic activity under visible light, giving isolated yields of up to 97 %. In addition, the photocatalytic activity of standalone diquat and methyl viologen through formation of an electron donor acceptor complex is presented.
Topics & Concepts
DiquatChemistryPhotochemistryMoietyElectron acceptorAcceptorPhotocatalysisElectron donorPhotoredox catalysisCatalysisCombinatorial chemistryOrganic chemistryParaquatCondensed matter physicsPhysicsSulfur-Based Synthesis TechniquesRadical Photochemical ReactionsOxidative Organic Chemistry Reactions