Tributylphosphine is widely used as a ligand in organometallic chemistry, particularly in the synthesis of metal complexes. It plays a crucial role in catalysis, especially in palladium-catalyzed cross-coupling reactions, which are essential for forming carbon-carbon bonds in organic synthesis. Additionally, it is employed in the production of semiconductors and nanomaterials, where it acts as a reducing agent or stabilizer. In the polymer industry, tributylphosphine is utilized as a catalyst or additive to modify polymer properties. It also finds applications in the synthesis of pharmaceuticals and agrochemicals, where it aids in the formation of complex molecular structures.