Used primarily as a key intermediate in the synthesis of pharmaceuticals and agrochemicals. Its reactivity allows for the introduction of sulfonyl groups into organic molecules, facilitating the creation of sulfonamides, which are common structural motifs in many biologically active compounds. Widely employed in medicinal chemistry for drug development, especially in the design of enzyme inhibitors. Also utilized in the preparation of dyes and functional materials due to its ability to modify aromatic systems. Its role as a sulfonylating agent makes it valuable in both laboratory research and industrial-scale organic transformations.