Used as an intermediate in the synthesis of dyes and pigments, particularly for azo dyes, due to its aromatic structure and chlorine functionality that facilitates coupling reactions. It also serves in the production of fluorescent whitening agents for textiles and paper. In pharmaceuticals, it acts as a building block for anti-inflammatory and analgesic agents. Its naphthalene core allows for strong UV absorption, making it useful in certain photostable sunscreen formulations and UV absorbers in plastics. Additionally, it finds use in research for developing organic semiconductors and specialty polymers.