Abstract
Several immobilized catalysts containing oxovanadium (IV) have been prepared through anchoring and adsorption processes and are used in the epoxidation of chalcone with tert-butylhydroperoxide. Use of anchored catalysts like, [VO(PS-FSAL-OAP). DMF] and [VO(PS-FSALEN)] (where PS-H(2)FSALOAP=polystyrene supported ligand derived from 3-formyl salicylaldehyde and o-amino phenol and PS-H(2)FSALEN = polystyrene supported ligand derived from 3-formyl salicylaldehyde and ethylenediamine) facilitate the formation of epoxide of 1,3-diphenyl-2-propen-1-one in excellent yield. These catalysts are generally more active than homogeneous model. H-1 NMR spectral studies indicated formation of the trans epoxy 1,3-diphenyl-2-propen-1-one. A suitable mechanism for the formation of epoxychalcone is suggested.