ChemInform Abstract: Facile Formation of Semi-Reduced Radicals of cis-N,N′-Diacylindigos by Visible-Light-Induced One-Electron Transfer from Tertiary Amines

N,N′-Oxalyl and N,N′-malonyl derivatives of indigo and 6,6′-di-t-butylindigo were reduced with high quantum efficiencies to their semi-reduced radicals by visible light irradiation in the presence of tertiary amines. These semi-reduced radicals were reversibly autoxidized and thus oxidative dealkylation of tertiary amines was catalyzed photochemically by these indigos.