Used primarily as a key intermediate in the synthesis of conjugated polymers for organic electronics, such as organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). Its ethynyl group enables coupling reactions that extend π-conjugation, enhancing electronic properties. Also employed in the preparation of pharmaceuticals and agrochemicals due to its reactive chlorine and alkyne functionalities, allowing for further functionalization. Commonly utilized in Sonogashira and Suzuki coupling reactions to build complex heterocyclic systems in materials science and medicinal chemistry.