Used primarily as a key intermediate in the synthesis of pharmaceuticals and agrochemicals. Its reactivity allows for the introduction of sulfonyl chloride functional groups into more complex molecules, facilitating the development of active ingredients in herbicides and certain medicinal compounds. It is also employed in organic research for constructing sulfonamide derivatives, which are important in drug discovery due to their biological activity. Handling requires caution due to its moisture sensitivity and potential to release corrosive fumes.