Used as a reagent in organic synthesis, particularly for introducing sulfonyl fluoride groups into molecules. It serves as an intermediate in the preparation of certain pharmaceuticals and agrochemicals. Its reactivity makes it useful in modifying functional groups in complex molecule synthesis. Also employed in research settings for studying enzyme inhibition and protein labeling due to the electrophilic nature of the sulfonyl fluoride moiety. Requires careful handling due to its lachrymatory and corrosive properties.