Used primarily as a key intermediate in the synthesis of sulfonamide-based pharmaceuticals. It reacts readily with amines to form sulfonamides, which are important structural motifs in many biologically active compounds, including antimicrobial and anti-inflammatory agents. Its reactivity makes it valuable in medicinal chemistry for constructing drug candidates during research and development. Also employed in the preparation of agrochemicals and functional materials where sulfonyl groups enhance stability or activity. Commonly handled under anhydrous conditions due to sensitivity to moisture.