Silica-functionalized N-propylpiperazine for immobilization of palladium nanoparticles as efficient heterogeneous catalyst for cyanation reactions

Abstract

An efficient heterogeneous Pd catalytic system has been developed, based on immobilization of Pd nanoparticles (PNPs) on a silica-bonded N -propylpiperazine (SBNPP) substrate. The SBNPP substrate effectively stabilizes the PNPs and improves their stability against aggregation. The catalytic activity of this catalyst was investigated in the cyanation of aryl halides with K 4 [Fe(CN) 6 ] as the cyanide source. The catalyst could be recycled several times without appreciable loss of catalytic activity. A simple and efficient procedure for the cyanation of aryl halides with K 4 [Fe(CN) 6 ] in the presence of Pd nanoparticles on silica-bonded N-propylpiperazine (PNP-SBNPP) is described. This heterogeneous catalyst could be recycled several times without appreciable loss of catalytic activity.