Tributyl(3-methyl-2-butenyl)tin is primarily used in organic synthesis as a reagent for the preparation of various organotin compounds. It plays a significant role in the formation of carbon-tin bonds, which are essential in cross-coupling reactions, particularly in Stille coupling. This reaction is widely employed in the synthesis of complex organic molecules, including pharmaceuticals, agrochemicals, and advanced materials. Additionally, it is utilized in the development of catalysts for polymerization processes, contributing to the production of specialized polymers. Its application extends to research and development in organometallic chemistry, where it aids in studying the reactivity and mechanisms of tin-containing compounds.