Used as a key intermediate in the synthesis of sulfa drugs and other biologically active compounds. It plays an important role in the preparation of sulfonamide-based pharmaceuticals by reacting with amines to form sulfonamides, which are core structures in antibiotics and antimicrobial agents. Also utilized in agrochemical synthesis for developing herbicides and plant growth regulators. Its reactivity makes it valuable in organic synthesis for introducing sulfonyl functional groups into complex molecules.