4’-Chloro-2-hydroxy-benzophenone is a useful compound to investigate the effects of substituents on photo-antioxidant abilities of 2-hydroxybenzoyl compounds that canÂpreventÂautooxidation of plastics under UV light.4’-Chloro-2-hydroxy-benzophenone can also utilized to develop novelÂAzomethine Prodrugs of (R)-α-Methylhistamine.