Used primarily in the production of high-performance polymers, such as polyesters and polyamides, it acts as a key monomer. It is also employed in the synthesis of pharmaceuticals, where it serves as an intermediate in creating active ingredients. In the field of organic synthesis, it is utilized for introducing phthaloyl protecting groups, which are essential in complex molecule construction. Additionally, it finds application in the manufacture of dyes and pigments, contributing to their stability and color properties. Its reactivity with various compounds makes it valuable in research and industrial processes for developing advanced materials.