We demonstrate hydrohalogenation of aliphatic alkenes with collidine·HX salts through a dual photoredox/cobalt catalysis. The dual catalysis enables to convert a proton and a halide anion from collidine·HX salt to a nucleophilic hydrogen radical equivalent and an electrophilic halogen radical equivalent and deliver them to an alkene moiety. This protocol allows for introduction of fluorine, chlorine, bromine or iodine atom to alkene, producing highly functionalized alkyl halides.
DOI: 10.1021/jacs.3c10133