Used primarily as an intermediate in the synthesis of agrochemicals and pharmaceuticals, this compound serves as a sulfonating agent to introduce the sulfonyl chloride functional group into target molecules. Its reactivity allows for the formation of sulfonamides and sulfonate esters, which are key structural motifs in certain herbicides and fungicides. It is also employed in research settings for modifying bioactive molecules to enhance stability or alter solubility. Due to its sensitivity to moisture, it is handled under anhydrous conditions in controlled environments.