This chemical is primarily utilized in organic synthesis, particularly in cross-coupling reactions such as the Stille coupling. It serves as a reagent for introducing the phenylethynyl group into various organic compounds, enabling the formation of carbon-carbon bonds. This is especially valuable in the synthesis of complex molecules, including pharmaceuticals, agrochemicals, and advanced materials. Its application is also seen in the development of conjugated polymers and organic semiconductors, where precise control over molecular structure is critical for optimizing electronic properties. Additionally, it is used in research to explore new synthetic pathways and to create novel compounds with potential applications in catalysis and material science.