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 kinase inhibitors and receptor antagonists. Also utilized in materials science for modifying polymer reactivity and in research settings for labeling or derivatizing compounds due to the bromine handle allowing further functionalization via cross-coupling reactions.