Used primarily as a highly reactive intermediate in organic synthesis, especially in the preparation of sulfonamide-based compounds. Its fluorosulfonyl and acyl chloride functional groups allow dual reactivity, enabling sequential or selective transformations. Commonly employed in the development of pharmaceuticals, agrochemicals, and functional materials where strong electron-withdrawing sulfonyl groups are needed. Also utilized in polymer chemistry to introduce sulfonyl fluoride moieties, which can enhance thermal stability and chemical resistance of resulting polymers. Due to its high reactivity, it is handled under controlled conditions and often used in anhydrous environments.