1-Nonyne is primarily used in organic synthesis as a building block for more complex molecules. It serves as a key intermediate in the production of pharmaceuticals, agrochemicals, and specialty chemicals. Its terminal alkyne functionality makes it suitable for coupling reactions, such as the Sonogashira coupling, which is widely employed in the synthesis of conjugated polymers and organic electronic materials. Additionally, 1-Nonyne is utilized in research and development for creating novel compounds with potential biological activity. It is also employed in the preparation of surfactants and lubricants due to its hydrophobic chain, which can modify surface properties effectively. In material science, it is used to functionalize surfaces or nanoparticles, enhancing their compatibility with organic matrices.