Used primarily as a reagent in organic synthesis, it facilitates the introduction of the sulfonyl group into various molecules. It is particularly valuable in the preparation of sulfonamides, which are crucial in pharmaceutical development for their antibacterial properties. Additionally, it serves as a key intermediate in the synthesis of complex organic compounds, including dyes and polymers. Its reactivity with amines and alcohols makes it a versatile tool in creating sulfonate esters and other derivatives, enhancing the functionality of target molecules in research and industrial applications.