A visible light mediated metal-free heterogeneous photocatalytic system has been developed for highly efficient benzylic C–H oxygenations utilizing graphitic carbon nitride (g-C3N4) as a recyclable, nontoxic and low cost photocatalyst.
A highly efficient, non-toxic, metal-free, low-cost, acid–base bifunctional sulfonated graphitic carbon nitride (S-g-C3N4) nanosheets for Knoevenagel condensation and multicomponent tandem reactions under environmentally benign conditions.