Single-electron transfer oxidation-induced C–H bond functionalization via photo-/electrochemistry

C–H bond functionalization, which meets with the concept of atom and step economy, has been the hot topic in synthetic chemistry during the past decade. The most representative transition metal-catalyzed C–H bond functionalization usually involves the cleavage of a C–H bond, formation of a C–M bond, and subsequent transformation. Recently, with the fast development of oxidation modes (photo-, electrochemistry), single-electron transfer (SET) oxidation-induced C–H bond functionalization has attracted more and more attention. The substrate molecule is initially oxidized to form radical cation species by losing an electron. Then, the active radical cation can be further functionalized more easily. The feature of SET oxidation-induced C–H bond functionalization provides more opportunities for constructing compounds under mild conditions.