Study on the Epoxidation ofα,β-Unsaturated Ketones Catalyzed by MCM-41 Supported Schiff Base

Abstract

The novel mesoporous molecular sieves MCM-41 supported Schiff base was prepared by MCM-41 and Schiff base, which was synthesized by 3-chloropropyltriethoxysilane, 1,2-cyclohexanediamine with 2-phenyl-2H-1,2,3-triazole-4-carbaldehyde. The catalyst was characterized by methods of Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The epoxidation of α,β-unsaturated ketones catalyzed by MCM-41 supported Schiff base was studied in the presence of H2O2. The reaction con- ditions such as metal salts, different solvents, reaction temperature, the catalyst amount, and reaction time were investigated. It was found that the epoxidation of α,β-unsaturated ketones was easily obtained in excel- lent yields (up to 99%) using acetonitrile as the solvent at room temperature in short time. Especially, the heterogeneous catalyst can be reused four times without significant loss of its catalytic activity.