Used primarily as an intermediate in the synthesis of pharmaceuticals and agrochemicals. Its reactive sulfonyl chloride and ester groups allow for sequential functionalization, making it valuable in constructing complex organic molecules. Commonly employed in the preparation of sulfonamide derivatives, which are key structural motifs in various bioactive compounds, including antimicrobial and anti-inflammatory agents. Also utilized in the development of herbicides and plant growth regulators due to its ability to modify aromatic scaffolds with chlorine and sulfonyl functionalities. Its versatility in cross-coupling and substitution reactions enhances its utility in medicinal chemistry and crop protection research.