Visible-light photoredox catalyzed dehydrogenative synthesis of allylic carboxylates from styrenes

The visible-light photoredox/[Co(III)] co-catalyzed dehydrogenative functionalization of cyclic and acyclic styryl derivatives with carboxylic acids is documented. The methodology enables the chemo- and regioselective allylic functionalization of styryl compounds, leading to allylic carboxylates (32 examples) under stoichiometric acceptorless conditions. Inter as well as intramolecular variants are documented in high yields (up to 82%). A mechanistic rational is also proposed based on a com-bined experimental and spectroscopic investigation