Abstract:A novel heterogeneous transition-metal catalyst comprising a polymer-supported terpyridine palladium(II) complex was prepared and found to promote the Suzuki-Miyaura, Mizoroki-Heck, Sonogashira, and Tsuji-Trost, reactions in water under aerobic conditions with a high to excellent yield. The catalyst was recovered by simple filtration and directly reused several times without loss of catalytic activity.

A polymer-supported terpyridine Pd(II) complex was prepared and found to promote the SuzukiMiyaura coupling reaction in water. Thus, terpyridine ligand was prepared from p-hydroxybenzaldehyde, propane sultone, and 2-acetylpyridine according to the reported procedures. Immobilization of terpyridine ligand onto a polystyrene-poly(ethylene glycol) (PS-PEG) resin through ionic bonds to sulfonate group took place and the complexation of PS-PEG-terpyridine ligand with Pd(II) underwent to give PS-PEG-terpyridine-Pd(II) complex. This polymeric catalyst showed high catalytic activity and high reusability for the Suzuki-Miyaura coupling reaction.

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A novel heterogeneous transition-metal catalyst, a polymer-supported terpyridine-palladium(II) complex, was prepared and found to promote the Mizoroki-Heck reaction in water between aryl halides and styrenes under aerobic conditions with high to excellent yield. The catalyst was recovered and reused several times without loss of catalytic activity.

The title complex promotes the cycloaddition of azides (II) with terminal and internal alkynes (I) in water to give the triazole derivatives (III). The catalyst can be recovered and reused several times without any loss of activity and without significant Cu leaching. -(SUZUKA*, T.; KAWAHARA, Y.; OOSHIRO, K.; NAGAMINE, T.; OGIHARA, K.; HIGA, M.; Heterocycles 85 (2012) 3, 615-626, http://dx.doi.org/10.3987/com-11-12405 ; Dep. Chem., Biol., Mar. Sci., Univ. Ryukyus, Okinawa 903-02, Japan; Eng.) -M. Paetzel 32-135