Used as an intermediate in the synthesis of non-steroidal anti-inflammatory drugs (NSAIDs), particularly in the production of naproxen, a widely used pain reliever and fever reducer. It serves as a key building block due to its aromatic structure and functional groups that allow for further chemical modifications. Also employed in the development of agrochemicals and dyes, where its chlorinated naphthalene backbone contributes to stability and reactivity. Its derivatives can be found in some specialty polymers and optical brighteners.