INORGANIC SPIROCYCLIC COMPOUND FROM CYCLO TRIPHOSPHAZENE AND PHOSPHORUS(V) HYDRAZINE HETEROCYCLIC COMPOUND WITH TWIST CONFORMATION

-Tetrachloro-1',2',4',5'-tetramethyl-6'-phenoxy-6' zene-2-spiro-3'-cyc lodi[lambda(5)-phosphadiazane], C10H17Cl4N7OP4S, was synthesized in ou r laboratory from hexachlorocyclotriphosphazene and bis(N,N'-dimethylh ydrazido)thiophosphoric acid phenyl ester in THF in the presence of tr iethylamine. The cyclotriphosphazene part of the molecule consists of the expected nearly planar ring, whereas the saturated six-membered ph osphorus hydrazine ring adopts a strongly twisted conformation with P- N-N-P torsion angles of -68.5 (5) and -74.7 (5)degrees and C-N-N-C tor sion angles of -91.6 (7) and -85.6 (7)degrees. The N-N mean bond dista nce of 1.420 (8) Angstrom is in good agreement with other P-v-hydrazin e ring compounds.