Used primarily as an intermediate in the synthesis of sulfonyl-containing compounds, particularly in the preparation of certain pharmaceuticals and agrochemicals. It plays a key role in introducing sulfamoyl groups into organic molecules, which can enhance biological activity. Due to its reactivity, it is also employed in the development of functional polymers and specialty chemicals where sulfonamide linkages are required. Its chloroethyl and sulfonyl chloride groups allow for sequential reactions, making it valuable in multi-step organic syntheses.