Crystal structure of hexa-methyl 4,4',4'',4''',4'''',4'''''-[(1,3,5,2λ 5 ,4λ 5 ,6λ 5 -tri-aza-triphosphinine-2,2,4,4,6,6-hexa-yl)hexa-kis-(-oxy)]hexa-benzoate.

The title compound, C ₄₈ H ₄₂ N ₃ O ₁₈ P ₃ , achieved in a two-step synthesis, comprises a cyclo-triphosphazene core and six 4-meth-oxy-carbonyl-phen-oxy groups. Each P atom is attached to two substituents located up and down with respect to the plane of the phosphazene ring, the central P ₃ N ₃ ring having a twist-boat conformation. The three O/P/O planes and five of the six benzene rings are nearly perpendicular to the mean plane through the phosphazene ring [dihedral angles = 82.98 (8)-88.92 (8)°], while the remaining benzene ring forms a dihedral angle of 25.72 (7)°. The crystal packing is stabilized by van der Waals inter-actions only.