Visible light mediated efficient oxidative benzylic sp3 C-H to ketone derivatives obtained under mild conditions using O2Electronic supplementary information (ESI) available: Experimental procedure, characterization data, and copies of 1H and 13C NMR spectra. See DOI: 10.1039/c5cc06015j

A photooxygenation of benzylic sp 3 C-H reaction has been demonstrated using O 2 mediated by visible light. This protocol provides a simple and mild route to obtain ketones from benzylic sp 3 C-H bonds. Various benzylic sp 3 C-H bonds can be transformed into the desired ketone derivatives in moderate to good yields. The 18 O 2 labelling experiments demonstrated that the oxygen introduced into ketone originated from dioxygen. A plausible mechanism has been proposed accordingly. A photooxygenation of benzylic sp 3 C-H reaction has been demonstrated using O 2 mediated by visible light. Various benzylic sp 3 C-H bonds can be transformed into the desired ketone derivatives in moderate to good yields.