Redox-economical radical generation from organoborates and carboxylic acids by organic photoredox catalysis

A simple generation method of carbon radicals via 1e-oxidation of organotrifluoroborates and carboxylic acids by the action of an organophotoredox catalyst, 9-mesityl-10-methylacridinium perchlorate ([Acr(+)-Mes]ClO4), has been developed. This organophotocatalytic protocol is amenable to radical C-C bond formation with electron-deficient olefins.