Here we report a copper‐catalyzed protocol for the synthesis of α‐chloroketones from aromatic alkenes including electron‐deficient olefins under visible‐light irradiation. Preliminary mechanistic studies show that the peroxo Cu(II) species is the key intermediate and hydroperoxyl (HOO⋅) and chlorine (Cl⋅) radicals can be generated by ligand‐to‐metal charge transfer (LMCT).

An efficient, metal-free oxidation method of the Northo C(sp 3 )À H bond of amide via visible-light irradiation has been developed. A broad range of imides can be facilely obtained at room temperature and this protocol is show-cased in the gram-scale synthesis. Preliminary mechanistic studies revealed that a hydrogen atom transfer (HAT) process was involved and H 2 O offered the main oxygen source to achieve greener photochemical C(sp 3 )À H oxidation.

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