Used in organic synthesis as an intermediate for pharmaceuticals and fine chemicals. Its alkyne functionality allows participation in coupling reactions, such as Sonogashira coupling, enabling the construction of complex aromatic and conjugated systems. Commonly employed in the development of active pharmaceutical ingredients (APIs) where phenylacetylene derivatives are required. Also utilized in materials science for synthesizing organic semiconductors and conjugated polymers due to its ability to extend π-systems. The ester group facilitates further functionalization, making it a versatile building block in multi-step synthesis.