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 herbicides and fungicides due to the stability and bioactivity imparted by the sulfonyl moiety. Additionally, the bromine substituent allows for further functionalization via cross-coupling reactions such as Suzuki or Heck reactions, enabling the construction of complex aromatic systems in medicinal chemistry research.