Used primarily as an intermediate in the synthesis of agrochemicals and pharmaceuticals. Its sulfonyl chloride group readily reacts with amines to form sulfonamides, which are key structural motifs in many biologically active compounds. It is particularly valuable in the development of herbicides and fungicides due to the electron-withdrawing chloro and methoxy groups enhancing reactivity and target specificity. Also employed in the preparation of dyes and fluorescent tags for biochemical assays, where the aromatic framework provides stability and the chlorine atom allows for further functionalization. Commonly used in research settings for constructing complex molecules requiring selective sulfonylation.