Used primarily as an intermediate in the synthesis of biologically active compounds, especially in pharmaceuticals and agrochemicals. Its sulfonyl chloride group readily reacts with amines to form sulfonamides, which are key structural motifs in many drug molecules. It is employed in the development of kinase inhibitors and anti-inflammatory agents. Also utilized in medicinal chemistry research for building heterocyclic frameworks that exhibit potential antitumor, antiviral, or CNS-modulating activities. Its reactivity and stability make it valuable in solid-phase and solution-phase synthesis for high-throughput screening libraries.