Used primarily as an intermediate in organic synthesis, especially in palladium-catalyzed cross-coupling reactions such as the Stille reaction. It serves as a valuable reagent for introducing the isoquinoline moiety into complex molecules, which is useful in the development of pharmaceuticals and bioactive compounds. Its organotin functionality allows for efficient carbon-carbon bond formation under mild conditions, making it advantageous in the synthesis of nitrogen-containing heterocycles with potential applications in medicinal chemistry and materials science.