An improved preparation of mesoporous silica-supported Pd as sustainable catalysts for phosphine-free Suzuki-Miyaura and Heck coupling reactions

摘要

An improved and eco-friendly procedure has been developed to generate mesoporous silica-supported palladium nanoparticles (SiO2@PdNP) that could be used as a sustainable heterogeneous Pd catalyst for phosphine-free Suzuki-Miyaura and Heck coupling reactions with excellent turnover number and turnover frequency. The presence of Pd on the silica surface was detected by X-ray diffraction and the structural morphology of SiO2@PdNP was obtained by transmission electron micros-copy. The heterogeneous catalytic system is recyclable and leaching of the metal after the reaction is not apparently observed.