Hydrolytic ring opening reactions of anhydrides for first row transition metal dicarboxylate complexes

Ring opening reactions of 2,3-pyridine dicarboxylic anhydride are studied with hydrated salts of cobalt, nickel and zinc. The hydrated metal salts preferentially hydrolyze 2,3-pyridine dicarboxylic anhydride rather than causing esterification in methanol medium. Hydrolytic opening of 2,3-pyridine dicarboxylic anhydride by hydrated cobalt(II) acetate and nickel(II) acetate resulted in the corresponding chelate complexes of monodeprotonated 2,3-pyridine dicarboxylic acid. The reaction of copper acetate with pyromellitic dianhydride in the presence of 1,10-phenanthroline gives a dinuclear copper complex whereas a similar reaction with copper(II) chloride gives a mononuclear copper complex.

Ring opening reactions of 2,3-pyridine dicarboxylic anhydride were studied with hydrated cobalt, nickel and zinc salts. Hydrated metal salts preferentially hydrolyze 2,3-pyridine dicarboxylic anhydride over the esterification reaction in alcoholic medium. The bonding and the nature of the metal carboxylate complexes formed in these reactions are dependent on the type of metal as well as on the anion and nitrogen donor ligands.Figure optionsDownload as PowerPoint slide