Epoxidation of α,β-Unsaturated Ketones Catalyzed by Schiff Base Functionalized MCM-41 and Potassium Carbonate

Abstract

Mesoporous molecular sieves MCM-41 supported Schiff base was prepared from MCM-41,3-chloropropyltriethoxysilane,dis-thiocarbohydrazone and salicylide.Both as-prepared supported catalyst and K2CO3 were used to catalyze the epoxidation of α,β-unsaturated ketones in the presence of H2O2.All products from these oxidations were characterized by1H NMR and IR.The effects of reaction conditions such as metal salts,solvents,reaction temperature,the loading of catalyst,and reaction time on the oxidation reaction were investigated.It was found that the epoxidation products of α,β-unsaturated ketones were easily obtained with excellent yields(up to 93%) at room temperature in a short time.Especially,the heterogeneous catalyst can be reused four times without significant loss of its catalytic activity.