OMe OMe OMe OMe a) Scope with disubstituted VBO reagents 4 Based on the experimental results and well-established pathways for photoredox reactions with alkyl-DHPs, we propose that the vinylation takes place through the mechanism depicted in Scheme 5c. The catalytic cycle begins by excitation of photocatalyst [PC] to [PC]*, followed by SET oxidation of alkyl-DHP 1 by [PC]* to generate the PC radical anion and radical intermediate I. This intermediate reacts with VBX 2a to form product 3 and benziodoxolone radical II, which is reduced by [PC] •-to regenerate PC and give iodobenzoate III.