Used as a key intermediate in the synthesis of high-performance polymers, particularly in the production of polyimides and liquid crystalline polymers. Its reactive chloromethyl groups enable cross-linking and functionalization, enhancing thermal stability and mechanical strength in advanced materials. Also employed in the preparation of specialty resins and as a building block for organic semiconductors and optoelectronic materials. Additionally, it serves in the development of fluorescent dyes and sensors due to the naphthalene backbone’s inherent photophysical properties.