Used as a key intermediate in the synthesis of conjugated polymers and organic semiconductors, particularly in the development of polythiophene-based materials for organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). Its ethynyl group enables efficient coupling reactions, enhancing molecular conjugation and electronic properties. Also employed in the preparation of functionalized thiophene derivatives for use in sensors and light-emitting diodes (OLEDs). The bromine atom facilitates cross-coupling reactions such as Suzuki or Stille coupling, making it valuable in constructing complex π-conjugated systems.