A metal-free, eco-friendly protocol for the oxidative halogenation of aromatic compounds by using highly efficient and reusable graphene oxide

Abstract

Graphene oxide (GO), a carbocatalyst, is explored for its catalytic activity in halogenation reactions of active aromatics. Potassium halides as halogen sources and oxone as a green oxidant were utilized to halogenate aromatic substrates with methanol as the solvent. The protocol yields regioselective, desired products in high to excellent yields. GO was recycled successfully for four times without loss in its catalytic activity. The metal-free and mild reaction conditions, use of greener solvent, safe halide source and high recyclability of the catalyst makes this protocol environmentally benign.