Used primarily as a sulfonating agent in organic synthesis, enabling the introduction of sulfonyl groups into various substrates. It is particularly valuable in the preparation of sulfonamides, which are key motifs in pharmaceuticals and agrochemicals. Its reactivity allows for efficient derivatization of amines under mild conditions, making it useful in medicinal chemistry for drug design and development. Additionally, it serves as an intermediate in the synthesis of functional materials and specialty chemicals where controlled sulfonylation is required.