Used primarily as a key intermediate in the synthesis of pharmaceuticals and agrochemicals. Its reactive fluorosulfonyl group enables efficient sulfonamide and sulfonate ester formation, making it valuable in drug development. Commonly employed in the preparation of protease inhibitors and other bioactive molecules. Also utilized in materials science for modifying polymer surfaces due to its ability to introduce polar functional groups. Its high reactivity allows for selective derivatization in complex molecule assembly, especially in late-stage functionalization of active pharmaceutical ingredients (APIs).