Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of bioactive molecules and drug candidates. Its sulfonyl chloride group readily reacts with nucleophiles like amines and alcohols, making it valuable for constructing sulfonamide or sulfonate ester linkages. Commonly employed in medicinal chemistry for modifying aromatic scaffolds to enhance metabolic stability, binding affinity, or lipophilicity. Also utilized in agrochemical research for building functionalized aromatic compounds with potential pesticidal or herbicidal activity.