N-Heterocyclic Carbene-based Microporous Organic Polymer Supported Palladium Catalyst for Carbon-Carbon Coupling Reaction

Highly dispersed Pd(0) nanoparticles were successfully immobilized into stable N-heterocyclic carbene-based microporous organic polymer (NHC-MOP) via a simple post-treatment. The microporous structure of the NHC-MOP polymer can efficiently prevent the aggregation of Pd nanoparticles and the NHC-MOP network embedding with N-heterocyclic carbene ligand can efficiently disperse Pd particles, which promoting the catalytic activity of the polymers. As-synthesized Pd@NHC-MOP catalyst shows excellent catalytic activity in catalyzing the Suzuki-Miyaura and Heck cross-coupling reactions. The superior utility of Pd@NHC-MOP in catalysis was elucidated by the broad scope of the reactants and the high yields of the reaction products, together with the high recyclability of the catalyst. The Pd@NHC-MOP catalyst can be reused at least eleven times for Suzuki-Miyaura coupling reaction or nine times for Heck coupling reaction without any significant loss of the catalytic activity.