Mono cationic palladium(II): Synthesis, characterization and catalytic activity in Suzuki coupling
摘要:
Monocationic five and four-coordinate Pd-II complexes have been synthesized in a facile manner involving the reaction of (COD) PdCl2 with AgPF6 and a nitrogen or phosphorus ligand. Complexes synthesized via this route are five coordinate [PdCl(2,9-Me(2)Phen)(2)]PF6 2 and four coordinate [L3PdCl]PF6 (L = PPh3, 3; P(p-Tol)(3), 4; P(OEt)(3); 5). ESI-MS studies at varying cone-voltage indicated ligand dissociation depending upon ligand cone-angle. A halo-bridged complex [PdCl(mu-Cl){P(p-Tol)(3)}](2) 7 has been isolated from 4 in methanol. The cationic complexes have been screened as catalyst in Suzuki coupling involving aryl halide and phenylboronic acid. Complex 4 showed appreciable turnover. (C) 2011 Elsevier B.V. All rights reserved.