Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical industry. It reacts with amines and alcohols to form sulfonamide and ester derivatives, which are key structural motifs in drug development. Commonly employed in the preparation of biologically active compounds, including kinase inhibitors and anti-inflammatory agents. Its sulfonyl chloride group enables efficient conjugation in peptide modification and labeling processes. Also utilized in the synthesis of agrochemicals and functional materials due to its reactivity and stability under controlled conditions.