Used as an intermediate in organic synthesis, particularly in the preparation of conjugated molecules and functionalized aromatic compounds. Its alkyne functionality allows for participation in coupling reactions, such as Sonogashira or click chemistry, enabling the construction of complex molecular architectures. The diethoxy group can be hydrolyzed to reveal reactive aldehyde groups, making it useful in the synthesis of fragrances, pharmaceuticals, and specialty polymers. It is also employed in the development of fluorescent dyes and optoelectronic materials due to its ability to extend π-conjugation systems.