Epoxidation of alkenes with molecular oxygen catalyzed by immobilized Co(acac)and Co(bpy)lcomplexes within nanoreactors of Al-MCM-41

Abstract

Cobalt complexes with different ligands such as bipyridine, and acetylacetonate were immobilized within nanoreactors of Al-MCM-41, designated as Co(acac)Al-MCM-41 and Co(bipy) 2+/Al-MCM41. The immobilized complexes were characterized by XRD, Nadsorption desorption, FT-IR and UV-Vis techniques. It was found that Co(bipy) 2+/Al-MCM41 and Co(acac)Al-MCM-41 successfully catalyze the oxidation of norbornene, styrene, cis-stilbene, trans-stilbene, and cyclohexene with 68% to 100% conversion and 41% to 90% selectivity toward the corresponding epoxides. No desorption was observed during the course of reactions. © 2012 Hindawi Publishing Corporation.