Acyl Radicals from Aromatic Carboxylic Acids by Means of Visible‐Light Photoredox Catalysis

Simple and abundant carboxylic acids have been used as acyl radical precursor by means of visible‐light photoredox catalysis. By the transient generation of a reactive anhydride intermediate, this redox‐neutral approach offers a mild and rapid entry to high‐value heterocyclic compounds without the need of UV irradiation, high temperature, high CO pressure, tin reagents, or peroxides.