Sci. China. Chem., 2012, 55, 2095-2103.

1.Porouspolymer supported palladium catalyst for cross coupling reactions with highly activity and recyclability

Abstract：

Porouspolymer supported palladium catalyst for cross coupling reactions with highactivity has been successfully prepared by coordination of Pd2+ species withSchiff bases functionalized porous polymer. The catalyst has been systemicallyinvestigated by a series of characterizations such as TEM, N2 adsorption, NMR,IR, XPS, etc. TEM and N2 isotherms show that the sample maintains the nanoporous structure after the modification andcoordination. XPS results show that chemical state of palladium species in thecatalyst is mainly +2. More importantly, the catalyst shows very highactivities and excellent recyclability in a series of coupling reactionsincluding Suzuki, Sonogashira, and Heck reactions. Hot filtration andpoison of catalysts experiments have also been performed and the resultsindicate that soluble active species (mainly Pd(0)species) in-situ generated from the catalyst under the reaction conditions arethe active intermediates, which would redeposit to the supporter after thereactions.