Trimethylphosphine is widely used as a ligand in organometallic chemistry, where it forms stable complexes with transition metals, enhancing catalytic activity in various reactions. It plays a crucial role in the synthesis of fine chemicals and pharmaceuticals, particularly in processes like hydrogenation and hydroformylation. Additionally, it is employed in the production of semiconductors and electronic materials, where it aids in the deposition of thin films. Its strong reducing properties make it valuable in organic synthesis for deoxygenation and desulfurization reactions. In research, it is utilized to study reaction mechanisms and develop new catalytic systems.