Used primarily in organic synthesis as an intermediate for the production of various pharmaceuticals and agrochemicals. It plays a key role in the development of sulfonamide-based compounds, which are widely utilized in antibacterial and antifungal medications. Additionally, it is employed in the synthesis of specialty chemicals, including dyes and pigments, due to its reactive chlorosulfonyl group. Its application extends to research and development in creating novel compounds with potential therapeutic or industrial uses.