Used in organic synthesis, particularly in the development of complex molecules and pharmaceutical intermediates. It serves as a building block for creating cyclopentyl-containing compounds, which are valuable in medicinal chemistry. The ethynyl group allows for further functionalization through reactions like Sonogashira coupling, enabling the formation of carbon-carbon bonds. This chemical is also explored in materials science for designing polymers and advanced materials with specific electronic or structural properties. Its unique structure makes it a versatile reagent in research and industrial applications.