Used primarily as an intermediate in the synthesis of agrochemicals and pharmaceuticals. It plays a key role in the preparation of sulfa drugs and pyridine-based herbicides due to its reactive sulfonyl chloride group, which readily forms sulfonamides and sulfonate esters. Its chloropyridine structure enhances bioactivity, making it valuable in developing compounds with pesticidal properties. Also employed in the production of dyes and functionalized polymers where chloro and sulfonyl functionalities are needed for further chemical modification.