Used as an intermediate in organic synthesis, particularly in the preparation of sulfonamides, which are important in pharmaceuticals and agrochemicals. It reacts with amines to form sulfonamide derivatives, commonly found in drugs with antimicrobial, anti-inflammatory, and antidiabetic properties. Also employed in the development of dyes and polymers due to its reactivity and ability to introduce sulfonyl functional groups. Its ethyl-substituted aromatic ring enhances lipophilicity, making it useful in modifying drug molecules for improved membrane permeability.