Palladium Supported Porous Polyurea Frameworks as an Efficient Heterogeneous Catalyst for Suzuki-Miyaura Cross-coupling Reaction

Abstract

Porous organic polymers (POPs) are composed of amorphously linked bonds with high surface areas. Urea based porous organic polymer (UPOP) was synthesized by urea condensation reaction. Porous nature of UPOP was identified by Brunauer-Emmett-Teller (BET) analysis. To evaluate the possibility as heterogeneous catalysts, Pd was loaded onto UPOP, namely Pd@UPOP. XPS analysis and element mapping data confirmed that Pd was supported on Pd@UPOP, then Suzuki-Miyaura coupling reaction was performed with various aryl bromides. The optimized conditions for the catalytic activity of Pd@UPOP are using mixture of (H 2 O:EtOH 3:1) (v/v) as a solvent and K 2 CO 3 as a base. In this condition, reactions reached to 99% yields with Pd only 0.1 mol% under 1 h. Also, in recycling experiments, yields were maintained above 90% during five runs.