Chlorosulfonation is a chemical process used to introduce a chlorosulfonyl group into organic compounds. This reaction typically involves the treatment of an aromatic compound with a mixture of chlorine and sulfur trioxide. The resulting product is often used in the synthesis of various industrial chemicals, including dyes and pharmaceuticals. The chlorosulfonyl group is a versatile functional group that can enhance the reactivity of the compound. Chlorosulfonation is particularly important in the production of polysulfone and other high-performance polymers, which are valued for their thermal stability and chemical resistance.