Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical and agrochemical industries. It serves as a building block for sulfonamide derivatives, which are important in the development of bioactive molecules. Its reactivity allows for the introduction of sulfonyl groups into complex molecules, facilitating the creation of compounds with enhanced stability and biological activity. Commonly employed in the preparation of protease inhibitors and other medicinal agents where sulfonyl functionality is required. Also utilized in research settings for the modification of peptides and proteins through selective sulfonylation.