Radical 1,2-Addition of Bromoarenes to Alkynes via Dual Photoredox and Nickel Catalysis

A regioselective, intermolecular 1,2-addition of aryl bromides to alkynes enabled by the photocatalytic generation of bromine radicals via photoredox and nickel catalysis is reported. This mild and redox-neutral protocol tolerates a wide range of (hetero)aryl bromides as well as alkynes, diynes, and enynes, generating diverse alkenyl bromides with exclusive regioselectivity.