Photoredox synthesis of Vicinal Dichloride using FeCl3 as chlorine source

Abstract This work presents a photo‐redox vicinal dichlorination of acrylamides using a naturally abundant chlorine source (FeCl 3 ). The LMCT of FeCl 3 is responsible for the chlorine radical inducement, while the tetra‐ n ‐butylammonium decatungstate (TBADT) catalytic system enhanced the process. This method exhibits extraordinarily mild conditions, not requiring external ligands and low E factors, which enables scalable synthesis.