Used primarily as a key intermediate in the synthesis of pharmaceuticals and agrochemicals. Its sulfonyl chloride group readily reacts with amines and alcohols, making it valuable for constructing sulfonamide and sulfonate ester derivatives. Commonly employed in the development of bioactive molecules, including antimicrobial agents, antivirals, and enzyme inhibitors. Also utilized in materials science for modifying polymer reactivity or introducing bromo-functional handles for further derivatization via cross-coupling reactions.