The lessons from this mechanistic study could be used to "dial-in" a desired reactivity profile on substrates bearing both an olefin and a carbonyl group. Thus, exposure of undecanal (38) to reaction condition 1 led exclusively to the olefin hydrophosphorylation product (39). Submitting (38) to reaction condition 2 delivered modest yield of the diphosphorylated adduct (37). A third set of reaction conditions involved pre-electrolysis of reagent (2), terminating the electrolysis, followed by addition of (38) to cleanly afford only carbonyl hydrophosphorylation product (40).