An efficient Heck reaction in water catalyzed by palladium nanoparticles immobilized on imidazolium-styrene copolymers

作者：Qiao Kun^*; Sugimura Rie; Bao Quanxi; Tomida Daisuke; Yokoyamal Chiaki

来源：Catalysis Communications, 2008, 9(15): 2470-2474.

DOI：10.1016/j.catcom.2008.06.016

• Heck reaction
• ionic liquid
• copolymer
• supported Pd catalyst

Imidazolium-styrene copolymers were prepared by copolymerization of 1-vinyl-3-butylimidazolium based ionic liquids ([VBlm]X, X = Cl-, BF4-, and PF6-) with styrene, which were used as polymeric supports to immobilize Pd(OAc)(2) using a method of alcohol reduction. it was demonstrated that Pd existed in the form of Pd nanoparticles on these imidazolium-styrene copolymers. Using the [VBlm]Cl-styrene copolymer as a support, Pd nanoparticles of less than 6 nm were formed, which was particular interesting, as usually only a Pd carbene complex was formed when Pd(OAc)(2) was treated with 1,3-dialkyimidazolium ionic liquids containing a halide anion. The copolymer-supported Pd catalysts were found to be efficient and reusable catalysts for the Heck reaction in water in the absence of a phosphine ligand and phase-transfer catalyst.

• 出版日期2008-9-20