Reactions of zinc oxide with molten diacids and their anhydrides

Abstract The reactions of some organic diacids and their anhydrides with powdered ZnO were studied. The products are salts of approximately 1:1 mole composition. Their thermal stability is rather high, in comparison with their organic components. They are insoluble and usually cannot be recrystallized. It is suggested that anhydrides react with ZnO via their parent diacids, resulting initially in a half salt, as an intermediate product, followed by the formation of the normal salt.