N.N.N-tris[phosphinomethylen]amine N.N.N′-tris[phosphinomethylen]hydrazine N.N.N′.N′-tetra[phosphinomethylen]hydrazine

By reaction of hydroxymethylphosphines with ammonia and hydrazine the title compounds are obtained, which react as di-, tri- and tetradentate complex ligands.