Sulphonated'Click'Dendrimer-Stabilized Palladium Nanoparticles as Highly Efficient Catalysts for Olefin Hydrogenation and Suzuki Coupling Reactions Under Ambient Conditions in Aqueous Media

摘要

Water-soluble 1,2,3-triazolyl dendrimers were synthesized by"click chemistry"and used to stabilize palladium nanoparticles(PdNPs).These new"click"dendrimer-stabilized nanoparticles(DSN)are highly stable to air and moisture and are catalytically active for olefin hydrogenation and Suzuki coupling reaction,in aqueous media,under ambient conditions using a low amount of palladium(0.01 mol% Pd).Kinetic studies show high catalytic efficiency and high stability for the new"click"DSN in both reactions.The complexation of potassium tet-rachloropalladate(K2PdCl4)to the triazole ligands present in the dendritic structures was monitored by UV/vis and,after reduction,the nanoparticles were characterized by transmission electron microscopy(TEM).