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 forming sulfonamides and sulfonate esters—common motifs in drug design. It is especially useful in the development of bioactive molecules where the bromo substituent allows for further functionalization via cross-coupling reactions such as Suzuki or Heck reactions. Commonly employed in research laboratories for building complex aromatic structures in medicinal chemistry and in the preparation of specialty chemicals requiring selective derivatization.