MCM-41-supported poly(γ-mercaptopropylsiloxane palladium(0)) complex as an efficient catalyst for Heck arylation of conjugated alkenes with aryl halides

摘要

MCM-41-supported poly(γ-mercaptopropylsiloxane palladium(0)) complex [MCM-41-SH-Pd(0)] was conveniently synthesized from commercially available and cheap γ-mercaptopropyltriethoxysilane via immobilization on MCM-41, followed by reacting with palladium chloride and then the reduction with hydrazine hydrate. XRD and XPS spectroscopy were employed to characterize the title palladium complex. It was found that this complex is a highly active and stereo-selective catalyst for Heck arylation of conjugated alkenes with aryl halides and can be reused many times without loss of activity.