Primarily used in organic synthesis as a sulfonating agent, it introduces the sulfonyl group into various organic compounds, enabling the formation of sulfonamides, sulfonate esters, and other sulfonyl-containing derivatives. It is valuable in pharmaceutical research for modifying drug molecules to enhance their properties, such as solubility, stability, or bioavailability. Additionally, it finds application in the production of specialty chemicals, including surfactants and polymers, where sulfonyl groups are integral to functionality. Its reactivity with amines and alcohols makes it a versatile intermediate in the development of fine chemicals and agrochemicals. Proper handling is essential due to its corrosive and moisture-sensitive nature.