Synthesis, structure, and catalytic properties of palladium complexes containing bis(phosphino)-amine ligands

Abstract

Two N,N-bis(diphenylphosphino)-amine ligands [amine=4-aminomorpholine (L1) or 1-amino-4-methylpiperazine (L2)] and their Pd(II) complexes were synthesised and characterised by IR and NMR spectroscopies. The structures of ligand L1 and both complexes C1 and C2 were determined by X-ray crystallography. The catalytic activity of C1 and C2 in the Heck coupling reactions was assessed. The effect of parameters such as palladium source, solvent, base and reaction time on the conversion was investigated to obtain the optimum conditions for the reaction.