Visible-Light-Driven Carboxylation of Aryl Halides by the Combined Use of Palladium and Photoredox Catalysts

A highly useful, visible-light-driven carboxylation of aryl bromides and chlorides with CO 2 was realized using a combination of Pd(OAc) 2 as a carboxylation catalyst and Ir(ppy) 2 (dtbpy)(PF 6 ) as a photoredox catalyst. This carboxylation reaction proceeded in high yields under 1 atm of CO 2 with a variety of functionalized aryl bromides and chlorides without the necessity of using stoichiometric metallic reductants.