Heck Heterocoupling within a Dendritic Nanoreactor

摘要: Palladium nanoparticles (2−3 nm in diameter) have been prepared within covalently functionalized poly(propylene imine) (PPI) dendrimers, and the resulting composite materials are shown to be effective for Heck coupling reactions. Two novel concepts demonstrated this report. The first concept involves incorporation of Pd0 into PPI dendrimers with perfluorinated polyether chains on their periphery. second example a carbon−carbon reaction catalyzed by dendrimer-templated nanomaterial, specifically, catalytic heterocoupling between nonactivated aryl halides n-butylacrylate mediated dendrimer-encapsulated catalysts. These reactions were carried out homogeneous fluorous/organic phase at elevated temperature, catalyst was recovered cooling room temperature concomitant separation. found catalytically active only 90 ...