Used as a key monomer in organic synthesis, particularly in the preparation of conjugated polymers for optoelectronic devices. Its rigid ethynylene backbone and ester functional groups enable efficient π-conjugation, making it valuable in the development of organic semiconductors, light-emitting diodes (OLEDs), and photovoltaic materials. The compound participates in palladium-catalyzed coupling reactions to build extended aromatic systems. It is also employed in the synthesis of metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) due to its ability to form stable, porous structures with defined geometry. Its linear, symmetrical structure supports the design of materials with high thermal stability and tunable electronic properties.