Fig. 1: Anti-Markovnikov hydrofunctionalization of alkenes.

a, Syntheses of anti-Markovnikov compounds from alkenes via two-step redox processes (FG = Cl or OH). b, Catalytic anti-Markovnikov hydrofunctionalizations of styrenes. c, A proposed pathway for the ideal radical anti-Markovnikov hydrofunctionalization with HX (X = Cl or ONO2). PC, photoredox catalysis; PT, phase transfer.