Used primarily as an intermediate in organic synthesis, this compound serves in the preparation of specialty alkyne derivatives for research and development. Its reactive alkyne and chloride functionalities allow for selective coupling reactions, making it valuable in the construction of complex organic molecules. It is employed in the synthesis of pharmaceuticals, agrochemicals, and functional materials where a nine-carbon alkyne chain with a terminal chlorine is required. Due to its reactivity, it is also utilized in cross-coupling reactions such as Sonogashira and nucleophilic substitutions to introduce the nonynyl group into larger frameworks. Its role is mostly confined to laboratory-scale applications and not for consumer product use.