Used as a key intermediate in organic synthesis, particularly in the production of pharmaceuticals and agrochemicals. Its aldehyde and ethynyl groups make it valuable for constructing complex molecules through reactions like Sonogashira coupling, click chemistry, and aldol condensation. It is also employed in the development of fluorescent dyes and molecular probes for biological imaging, owing to its ability to form stable conjugated systems. Additionally, it serves as a building block in materials science for creating polymers and advanced materials with tailored electronic or optical properties.