Used primarily as an intermediate in organic synthesis, especially in cross-coupling reactions such as Stille coupling. It enables the formation of carbon-carbon bonds in the construction of complex pyrimidine derivatives, which are common structural motifs in pharmaceuticals and agrochemicals. Its tributylstannyl group facilitates palladium-catalyzed reactions, making it valuable in the development of active pharmaceutical ingredients and functional materials. Due to the toxicity associated with tin residues, it is typically employed in controlled environments with careful purification of final products.