ENE-6-SPIRO-2'-1',3'-DIAZA-2'-PHOSPHA-CYCLOHEXANE, C23H36N13P3

The title phosphazene, P(3)N(3)R(4)XX, where R is 3,5-dimethylpyrazole and XX is a spiro-bonded -NH- CH2CH2CH2NH- ring, has P-N bonds of 1.5 54 (5)-1.614 (5) Angstrom in the phosphazene ring with exocylic bonds of 1.609 (5) and 1.635 (5) Angstrom to the spiro ring and 1.683 (4)-1. 708 (5) Angstrom to the pyrazole groups. The N-P-N angle within the ph osphazene ring at the unique P atom is 6.9 (3)degrees smaller than tho se at the other P atoms. One of the pyrazole-substituted P atoms is di splaced by 0.252 (5) Angstrom from the best plane of the other five ri ng atoms, which are coplanar to within 0.087 (6) Angstrom. The -PNCCCN - ring conformation is intermediate between a boat and a twist-boat.