Undecylbenzene is primarily used as an intermediate in the production of surfactants and detergents. Its long alkyl chain makes it suitable for creating compounds that lower surface tension, enhancing the cleaning efficiency of various formulations. It is also employed in the synthesis of specialty chemicals, including lubricants and plasticizers, where its structure contributes to improved performance and stability. Additionally, undecylbenzene finds application in research and development for studying organic reactions and material properties.