Used as a key intermediate in organic synthesis, particularly in cross-coupling reactions such as Sonogashira and Suzuki couplings. It enables the construction of conjugated organic molecules for applications in materials science, including organic light-emitting diodes (OLEDs), organic solar cells, and semiconducting polymers. The presence of both bromo and ethynyl functional groups allows for selective and sequential reactions, making it valuable in the synthesis of complex aromatic and acetylenic frameworks. It also exhibits good electrical conductivity and light absorption properties. Additionally, it serves as a starting material for ligands in transition metal complexes used in various catalytic reactions. Employed in the development of fluorescent dyes and molecular sensors due to its rigid, planar structure that supports extended π-conjugation.