1,1,1-Tris(diphenylphosphinomethyl)ethane, also called Triphos, is an organophosphorus compound with the formula CH3C[CH2PPh2]3.

An air-sensitive white solid, it is a tripodal ligand ("three-legged") of idealized C3v symmetry.

It was originally prepared by the reaction of sodium diphenylphosphide and CH3C(CH2Cl)3:[1] It forms complexes with many transition metals, usually as a tripodal ligand.

Illustrative cases include fac-[Mn(CO)3Br(η2-triphos)] and [M(CO)4(η2-triphos)], where M is Cr, Mo, or W. Triphos serves as a tridentate-bridging ligand in an icosahedral Au13 cluster.

The phosphine bridges three chlorogold(I) groups to form the tripod molecule of trichloro-1,1,1-(diphenylphosphinomethyl)ethanetrigold(I), CH3C[CH2PPh2AuCl]3.