Widely used as an intermediate in the synthesis of sulfa drugs, particularly in the production of antimicrobial and antifungal agents. It plays a key role in the preparation of sulfonamide-based pharmaceuticals due to its ability to form stable sulfonamide bonds with amines. Commonly employed in the development of herbicides and plant growth regulators, where it contributes to the chlorinated aromatic backbone essential for bioactivity. Also utilized in agrochemical manufacturing for creating selective pesticides. Its reactivity makes it valuable in organic synthesis for introducing sulfonyl chloride functional groups into complex molecules.