Widely used as an intermediate in the synthesis of sulfa drugs and agrochemicals. Its reactivity allows for the introduction of sulfonyl groups into various organic molecules, making it valuable in the development of herbicides and pharmaceuticals. Commonly employed in the preparation of sulfonamides through reaction with amines, which are key structural motifs in many bioactive compounds. Also utilized in research settings for modifying aromatic systems to enhance electron-withdrawing properties in functional materials.