Iron/Zinc-Co-catalyzed Directed Arylation and Alkenylation of C(sp3)–H Bonds with Organoborates

An iron­(III) salt, (Z)-1,2-bis­(diphenylphosphino)­ethene or its electron-rich congener, (Z)-1,2-bis­[bis­(4-methoxyphenyl)­phosphine]­ethene, and a zinc­(II) salt catalyze the arylation, heteroarylation, and alkenylation of propionamides possessing an 8-quinolylamide group with organoborate reagents in the presence of 1,2-dichlorobutane as oxidant at 70 °C. Stoichiometric experiments provided evidence for the involvement of an organoiron­(III) species as a key intermediate for C–H activation and C–C bond formation.