Recyclable Pd catalysts supported on polymers bearing azine moities

This manuscript describes the synthesis and the catalysis of new recyclable polymer-supported Pd catalysts, applicable to Mizoroki-Heck coupling. The prepolymers bearing azine structures as the ligation groups were prepared via the reaction of poly(methyl vinyl ketone) and hydrazine to produce a polymer bearing hydrazone moieties followed by its reaction with aromatic aldehydes. The activities of the catalysts were higher as the decrease of the electron densities of the azine moieties.