Used as a key intermediate in organic synthesis, particularly in the preparation of sulfonamide derivatives, which are essential in pharmaceutical and agrochemical industries. It is employed in the development of bioactive compounds, including potential drug candidates, due to its reactivity in forming sulfonamide bonds. Additionally, it finds application in the synthesis of dyes, pigments, and other specialty chemicals, leveraging its sulfonyl chloride functional group for efficient chemical transformations. Its role in creating sulfonated polymers also contributes to materials science, particularly in producing polymers with specific functional properties.