A mild Synthesis of Pyrophthalone Derivatives Catalyzed by ZnO Nanoparticles under Solvent-free Conditions

Pyrophthalone derivatives have been proposed as photo semiconductors for the preparation of electrophotographic materails [1]. A study of the electro physical properties of pyrophthalones in thin-film systems [2] showed that pyrophthalone, tetra chlorophyrophthalone, and γ-pyrophthalone have considerable photosensitivity.