Used primarily as an intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. It is employed in the preparation of sulfonamide derivatives, which are key components in various drugs, including antibiotics and diuretics. Additionally, it finds application in the development of dyes and pigments, where it acts as a sulfonating agent to introduce sulfonyl groups into aromatic compounds. Its reactivity with amines and alcohols makes it valuable in creating complex molecules for research and industrial purposes.