Used as an intermediate in the synthesis of various organic compounds, particularly in the production of dyes and pigments. It serves as a key component in the manufacturing of specialty chemicals, including those used in the textile and paper industries. Additionally, it is employed in the preparation of sulfonamide derivatives, which have applications in pharmaceuticals and agrochemicals. Its role as a sulfonating agent is also significant in organic reactions, aiding in the introduction of sulfonic acid groups into aromatic compounds.