Used as an intermediate in the synthesis of pharmaceuticals, particularly in the development of kinase inhibitors and anti-inflammatory agents. Its sulfonyl chloride functional group allows for easy attachment to amines or alcohols, forming sulfonamides or sulfonate esters, which are common motifs in drug molecules. Also employed in the preparation of agrochemicals and functional materials where aryl sulfone derivatives are required. Its methoxyphenyl moiety can enhance binding selectivity in biologically active compounds.