Silica-supported poly-γ-aminopropylsiloxane palladium (Pd²⁺)-transition metal (Cu²⁺) complex: A new catalyst system for Heck reaction

2215-2217A new silica-supported poly-γ-aminopropysiloxane transition metal (Cu2+) and palladium (Pd2+) catalyst has been prepared from organic silica via immobilization on fumed silica, followed by treatment with Cu(OAc)2 and PdCl2 in ethanol. The catalyst is efficient for Heck arylation of aryl iodides with alkene. The effects of reaction temperature and Pd2+ content on catalytic properties have also been studied. Pd2+ has been found to improve the catalytic performance, reducing the react ion temperature (70oC) and the induction period. It provides an economic way to synthesize unsymmetrical trans -s tilbenes