Used primarily in the production of high-performance polymers, it serves as a key monomer in synthesizing polyimides, which are essential in the electronics industry for flexible printed circuit boards and insulating films. It is also employed in the manufacture of specialty coatings that provide exceptional thermal stability and chemical resistance, making it suitable for aerospace and automotive applications. Additionally, it finds use in organic synthesis as a reagent for introducing phthaloyl groups, aiding in the creation of pharmaceuticals and agrochemicals. Its role in producing liquid crystal polymers further enhances its importance in advanced material science.