Trihexylphosphine is widely used as a ligand in organometallic chemistry, particularly in the synthesis of metal complexes. It plays a crucial role in stabilizing metal centers, facilitating catalytic reactions such as hydroformylation, hydrogenation, and cross-coupling reactions. Its application extends to the production of fine chemicals, pharmaceuticals, and polymers, where it enhances reaction efficiency and selectivity. Additionally, it is employed in the development of advanced materials, including nanoparticles and semiconductors, due to its ability to control particle size and morphology. In research, it is utilized to study reaction mechanisms and develop new catalytic processes.