Photoexcited Transition‐Metal Catalyzed Carbon‐Halogen Bond Formation

Abstract Transition‐metal catalysis has proven useful in facilitating carbon‐halogen (C−X) bond formation. Despite the vast number of methodologies reported to furnish these bonds, limitations have remained, warranting continued development. The recent surge of metallaphotoredox‐based transformations has provided a novel gateway to bypass these limitations. Through the use of photoexcited species, the formation of C−X bonds arise through new mechanistic pathways, finding alternatives to high reaction temperatures and stoichiometric additives. The discovery of this novel strategy has provided access to molecular space that has not been previously attainable. Herein, we report the recent advances on transition‐metal photocatalyzed C−X bond formation, in hopes of easing the synthetic endeavours for chemists in industrial and academic laboratories.