Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical and agrochemical industries. It serves as a building block for sulfonamide compounds, which are key structures in many biologically active molecules. Its reactive sulfonyl chloride group allows for easy attachment to amines, making it useful in the preparation of sulfonamide-based drugs. It is also employed in the synthesis of dyes and functional materials where nitro and bromo groups can be further modified. The presence of both electron-withdrawing groups enhances its reactivity in cross-coupling reactions, enabling the construction of complex aromatic systems.