Used primarily as an intermediate in the synthesis of sulfa drugs, particularly in the production of certain antimicrobial and anti-inflammatory agents. Its reactive sulfonyl chloride group allows for easy attachment to amines, forming sulfonamide derivatives that are key structural motifs in many pharmaceuticals. It is also employed in the development of agrochemicals, where it helps create herbicides and plant growth regulators due to its ability to modify bioactive molecules. Additionally, it serves as a building block in organic synthesis for introducing methoxy and carbamoyl-substituted aryl sulfonyl groups, which can influence solubility and binding properties in drug design.