Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical industry. It serves as a key building block for constructing sulfonamide derivatives, which are important in the development of bioactive molecules and drug candidates. Its reactive sulfonyl chloride group readily couples with amines to form sulfonamides, enabling the creation of compounds with potential antimicrobial, anti-inflammatory, or kinase-inhibiting activities. It is also employed in the synthesis of agrochemicals and functional materials where aromatic heterocyclic sulfones are required.