Click'' magnetic nanoparticle-supported palladium catalyst: a phosphine-free, highly efficient and magnetically recoverable catalyst for Suzuki-Miyaura coupling reactions

A novel magnetic nanoparticle-supported nano-palladium catalyst was successfully prepared via a click'' route. The as-prepared catalyst was well characterized and evaluated in Suzuki-Miyaura coupling in terms of activity and recyclability in aqueous ethanol. It was found to be highly efficient for the reactions of various aryl bromides with arylboronic acids under phosphine-free and low Pd loading (0.2 mol%) conditions. Moreover, the catalyst could be easily separated from the reaction system by an external magnet and reused several times without a remarkable loss of its activity.