Used primarily as a sulfonating agent in organic synthesis, this compound plays a key role in the preparation of sulfonamides, which are important in pharmaceuticals and agrochemicals. It reacts with amines to form sulfonamide derivatives, a common functional group in drug design, including antibiotics and enzyme inhibitors. It is also employed in the protection of functional groups during multi-step syntheses due to the stability and selective reactivity of the sulfonyl moiety. Additionally, it serves as a reagent in the synthesis of dyes, polymers, and specialty chemicals where controlled sulfonylation is required.