Used primarily as an intermediate in organic synthesis, especially in the production of sulfonamide-based pharmaceuticals and agrochemicals. It serves as a sulfonylating agent, enabling the introduction of sulfonyl functional groups into target molecules. Its reactivity makes it valuable in the preparation of herbicides, insecticides, and certain medicinal compounds where sulfonamide linkages are required. Due to its high reactivity and potential hazards, it is typically handled under controlled conditions in industrial and research settings.