Used as a key intermediate in the synthesis of advanced polymers and resins, particularly in the development of high-performance materials for electronics and coatings. Its ethynyl group enables cross-linking reactions, enhancing thermal stability and mechanical properties in final products. Applied in the production of adhesives and composites for aerospace and automotive industries due to its ability to withstand extreme conditions. Also utilized in organic synthesis for creating specialized pharmaceuticals and agrochemicals, where its reactive anhydride group facilitates the formation of complex molecular structures.