Used primarily as an intermediate in the synthesis of sulfa drugs, this compound plays a key role in the pharmaceutical industry. Its reactive functional groups allow for the development of sulfonamide-based antibiotics, which are effective against a broad spectrum of bacterial infections. It is also utilized in the production of dyes and pigments due to its ability to form stable aromatic sulfonamide derivatives. Additionally, it serves in the preparation of polymer cross-linking agents, enhancing the thermal and chemical resistance of certain engineering plastics. Its chlorinated structure makes it suitable for further halogen exchange reactions in fine chemical manufacturing.