Catalytic Properties Of MCM-41-supported Palladium And Ruthenium Complexes In Carbon-sulfur And Carbon-carbon Bond Formation Reactions

This dissertation consists of three parts:Part one:MCM-41-supported mercapto ruthenium complex (MCM-41-SH-Ru(â…¢)) was conveniently prepared from commercially readily available y-mercaptopropyl-triethoxysilane via immobilization on MCM-41,followed by reaction with ruthenium chloride.This novel supported ruthenium complex exhibited high catalytic activity in the condensation reaction of aldehydes and ketones with thiols and can be recovered and reused several times without noticeable loss of activity.Part two:MCM-41-supported bidentate phosphine palladium(0) complex (MCM-41-2P-Pd(0)) was prepared by the reaction of a diphosphino-functionalized MCM-41 mesoporous material with palladium chloride, followed by reduction with hydrazine hydrate.It was found that the MCM-41-2P-Pd(0) complex is an efficient catalyst for the addition reaction of diaryl disulfides to terminal alkynes.This polymeric bidentate phosphine palladium(0) complex can be recovered by simple filtration and reused several times without loss of activity.Part three:MCM-41-supported bidentate nitrogen palladium(0) complex (MCM-41-2N-Pd(0)) was conveniently prepared from 3-(2-aminoethylamino)propyltrimethoxy-silane via immobilization on MCM-41,followed by reacting with palladium chloride and then the reduction with hydrazine hydrate. It was found that this palladium(0) complex exhibited high catalytic activity for the phosphine-free Sonogashira coupling reaction of aryl iodides with terminal alkynes.This supported bidentate nitrogen palladium catalyst can be recovered and reused several times without loss of activity.