4-n-Propoxyphenylacetylene is primarily used in organic synthesis as a building block for more complex chemical structures. It is often employed in the development of pharmaceuticals, particularly in the creation of compounds with potential therapeutic properties. Its acetylene group makes it a valuable intermediate in coupling reactions, such as Sonogashira coupling, which is widely used to form carbon-carbon bonds in the synthesis of fine chemicals and bioactive molecules. Additionally, it can serve as a precursor in the production of liquid crystals, which are essential components in display technologies like LCDs. The compound's unique structure also allows it to be utilized in material science for the design of advanced polymers and coatings with specific optical or electronic properties.