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Porous polymer supported palladium catalyst for cross coupling reactions with high activity and recyclability

Science China Chemistry 2012年第4期55卷 2095-2103页

作者： SUN Qi ZHU LongFeng SUN ZhenHua MENG XiangJu XIAO Feng-Shou Key Lab of Applied Chemistry of Zhejiang Provinee Department of ChemistryZhejiang University(XiXi Campus)Hangzhou 310028China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry Jilin University Changchun 130012China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Porous polymer supported palladium catalyst for cross coupling reactions with high activity has been successfully prepared by coordination of Pd 2+ species with Schiff bases functionalized porous polymer. The catalyst has been systemically investi-gated by a series of characterizations such as TEM, N 2 adsorption, NMR, IR, XPS, etc. TEM and N 2 isotherms show that the sample maintains the nanoporous structure after the modification and coordination. XPS results show that chemical state of palladium species in the catalyst is mainly +2. More importantly, the catalyst shows very high activities and excellent recycla-bility in a series of coupling reactions including Suzuki, Sonogashira, and Heck reactions. Hot filtration and poison of catalysts experiments have also been performed and the results indicate that soluble active species (mainly Pd(0) species) in-situ gener-ated from the catalyst under the reaction conditions are the active intermediates, which would redeposit to the supporter after the reactions.

关键词： heterogenous catalysis Pd coupling reactions nanoporous polymers

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