“Click” magnetic nanoparticle-supported palladiumcatalyst: 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.