Synthesis and characterization of new aromatic hydroxy acid compounds

Four novel aromatic hydroxy acid (HA) compounds N-(4-hydroxyphenyl)-4’-trimellitimide, N-(3-hydroxyphenyl)-4’-trimellitimide, N-(5-hydroxynaphthyl)-4’-trimellitimide and N-{4’-[2-(4-hydroxyph- enyl) isopropyl phenyl]}-4’’-trimellitimide are synthesized through nucleophilic substitution reaction of trimelitic dianhydrides with the corresponding aminophenol/aminonaphthol using polar aprotic solvents. The hydroxy acid compounds are characterized by FT-IR and 1H-NMR spectroscopy.