A graphene/hemin hybrid material as an efficient green catalyst for stereoselective olefination of aldehydes

A hemin/graphene composite, prepared by mixing an aqueous solution of graphene oxide (GO) with heminand sonicating the suspension for 5 h at room temperature, was investigated for olefination of aldehydesusing ethyl diazoacetate in the presence of triphenylphosphine. Efficient olefination of aromaticaldehydes with high (E)-selectivity was obtained, revealing that rGO/hemin is a promising heterogeneouscatalyst for the olefination reaction. The as-synthesized catalyst could easily be recovered from thereaction mixture and was subsequently used for several runs without any significantly loss in activity andselectivity.