Core-shell catalysts recycling

Ge, J.P., Zhang, Q., Zhang, T.R. and Yin, Y.D. (2008) Core-satellite nanocomposite catalysts protected by a porous silica shell controllable reactivity, high stability, and magnetic recyclability. Angewandte Chemie International Edition, 47 (46), 8924-8928. 

Palladium diphosphine complexes located at the core have also been found to be efficient, recoverable catalysts in a Stille coupling involving iodobenzene ant tributylvinyltin. This palladium complex, composed of a dendrimer of generation 3 bearing only one metallic center located at the core, was prepared in situ by reacting the dendrimer (Figure 38) with Pd(OAc)2. The obtained complex (1 or 5 mol.%) appeared to be a very efficient catalyst under mild conditions. Steric hindrance around the metallic center due to the dendrimer shell allowed the system to be recycled several times without loss of activity. 

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