Homogenization of inorganic material-supported palladiumcatalysts in Suzuki coupling reaction at room temperature

Abstract

Novel and homogeneous zirconium phosphonate-supported Pd catalysts with modest BET surface areas (25.6 and 24.7 m² g⁻¹), high pore volumes (0.39 and 0.73 cc g⁻¹) and nano-sized pores (1–10 nm) were prepared by embedding Na₂PdCl₄ particles in an organosoluble, porous and layered zirconium phosphonate with a filiform architecture structure for the first time. In the homogeneous palladium-catalyzed Suzuki coupling reaction at room temperature, various substituted benzene bromides with phenylboronic acids were smoothly converted into corresponding biphenyl compounds (82–97% yields), even in cases of electron–rich derivatives. These supported homogeneous Pd catalysts could be quantitatively recovered by using a solid/liquid separation technique and be highly active without loss of catalytic activity in three consecutive runs.