Used as a key reagent in organic synthesis, particularly in palladium-catalyzed cross-coupling reactions such as the Stille reaction. It enables the introduction of acetylene (alkyne) functionality into complex organic molecules, which is valuable in the construction of conjugated systems found in pharmaceuticals, agrochemicals, and advanced materials. Its ability to act as a bis-electrophile or bis-nucleophile makes it versatile for building carbon-carbon bonds. Commonly employed in the synthesis of natural products and functionalized polyynes. Due to the tin content, it requires careful handling and disposal due to potential toxicity and environmental impact.