The title compound, C(24)H(56)N(4)P(6) or ((i)Pr(2)N)(2)P-P(4)-P(N(i)Pr(2))(2), adopts a butterfly structure, with planar environments for the N atoms and pyramidal environments for the P atoms. The structure studied has a 15% twin component that is related by a twofold rotation about [100].