Abstract
Pd(BHEP)Cl-2 was synthesized and characterized (BHEP = 1,4-bis(2-hydroxyethyl) piperazine). The complex decomposes in two steps, leaving a residue of palladium metal. Amino acid ester (L) reacts with [Pd(BHEP)(H2O)(2)](2+) (BHEP = 1,4-bis(2-hydroxyethyl) piperazine), giving mixed-ligand complexes, [Pd(BHEP)L](2+). The kinetics of hydrolysis of [Pd(BHEP)L](2+) have been studied by pH-stat technique, and rate constants were obtained. Rate acceleration observed for glycine methyl ester is high. The effect with methionine methyl ester is much less marked, as the mixed-ligand complexes with these ligands do not involve alkoxycarbonyl donors. Possible mechanisms for these reactions are considered.