Cyclopropyltributylstannane is primarily used in organic synthesis as a reagent for introducing the cyclopropyl group into various organic compounds. It is particularly valuable in cross-coupling reactions, such as the Stille reaction, where it facilitates the formation of carbon-carbon bonds. This compound is also employed in the preparation of cyclopropyl-containing intermediates, which are important in the development of pharmaceuticals and agrochemicals. Additionally, it serves as a building block in the synthesis of complex molecules, including natural products and fine chemicals, due to its ability to efficiently transfer the cyclopropyl moiety.