Used primarily as a key intermediate in organic synthesis, particularly in the preparation of sulfonamide derivatives which are important in pharmaceuticals. It serves as a sulfonylating agent, enabling the introduction of the 2-phenylethylsulfonyl group to amines and other nucleophiles. This reactivity makes it valuable in the development of bioactive molecules, including potential drug candidates targeting neurological and inflammatory conditions. Its stability and selective reactivity also support its use in peptide chemistry and in the synthesis of functionalized polymers.