Used as a key intermediate in the synthesis of sulfa drugs, particularly in the preparation of sulfonamide antibiotics. It plays an important role in medicinal chemistry for constructing biologically active molecules by introducing the sulfonyl chloride functional group to nitrogen-containing heterocycles. Its reactivity allows for efficient coupling with amines to form sulfonamides, which are essential structural motifs in antimicrobial and anti-inflammatory agents. Also utilized in the development of agrochemicals and functional materials due to its ability to modify molecular properties through sulfonylation.