Novel Water Dispersible and Magnetically Recoverable Palladium Nano Catalyst for Room-Temperature Suzuki-Miyaura Coupling Reaction

Abstract

In this work, a new magnetic composite comprising starch, imidazolium and triazol groups is used as a support for stabilization of palladium nanoparticles. This material has been characterized by different techniques showing the presence of small and uniform Pd nanoparticles in about 2 nm size. Measuring contact angle confirmed important role of starch on increasing hydrophilic nature of the catalyst. Using 0.05 mol% of this catalyst aryl iodides or bromides reacted with boronic acids at room temperature in aqueous media and the corresponding products are obtained in very good to excellent yields. Hot filtration and PVPy poisoning tests confirmed the heterogeneous nature of the catalyst. E-factor of the catalyst was found in acceptable range and close to green chemistry standards. This catalyst is magnetically recovered and recycled for 10 consecutive times with small decrease in activity. Also, the robustness of this catalytic system is demonstrated by the characterization of the reused catalyst.