THE SYNTHESIS OF BINUCLEAR COPPER PROTEIN MODELS, OXYGENATION AND CATALYTIC-OXIDATION OF BENZOIN

New ligands (3 similar to 9) containing four imidazolyls have been pre pared efficiently by 2, 6 - bis (imidazolymethyl) - 4 - chlorophenol r eaction with 1, 2 - dibromoethane, 1, 3 - dibromopropane, 1, 4 - dibro mobutane or alpha, alpha' - dibromo - m - xylene. New binuclear copper protein models (10 similar to 16) in which two imidazolyls coordinate with each copper ion have been prepared also from the reaction of [Cu (CH3CN)(4)]ClO4 with ligands. The oxygenation of models has been studi ed. It's discovered that 13 complexes O-2 and inserts one of oxygen at oms into the 2 - position of m - xylyl spacer to form a phenolate and hydroxide bridge binuclear copper(II) complex, the others react via fo ur electrons reduction of the dioxygen molecule to give bis(mu - hydro xy) copper(II) complexes. The oxidation reaction of benzoin under the catalysis of the mimic system composed of the ligand and cuppric salt has been studied kinetically, the influence of basicities, additives a nd metal ions on reaction rate being examined. It's found that the mod el composed of 4 in admixture with copper salt partakes efficiency 6 f old higher than that under the catalysis of copper salt alone. The rea ction follows Michaelis - Menten saturation kinetic behavior and the k inetic paraments V-max, k(m), are 9.47 x 10(-5) mol . dm(-3) . s(-1) a nd 0.0418mol . dm(-3) respectively.