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Reactions of hexachlorocyclotriphosphazatriene, N3P3Cl6 1, with sodium aryloxides have been studied. Compound 1 was found to react by the nucleophilic substitution pathway to yield monocyclophosphazenes [N3P3Cl5(OC6H2Bu 3t-2,4,6) 5 and N3P3Cl4(OC6H2 Me-4-Bu2t-2,6) 2 6) and bi(cyclophosphazenes) [[Cl5N3P3-P3N3Cl 4(OC6H3Bu2t-2,6)] 7 and [N3P3 (OC6H3Bu2t-2,6)5]2 8]. The unusual bi(cyclophosphazenes) 1 and 8 are the first examples of two cyclotriphosphazene rings linked by a P-P bond [2.193 (2)Å], which have been obtained by reacting 1 with ArONa. The structures of compounds 5-8 are ascertained by elemental analyses, 1H-, 31P-13C-NMR, IR, and MS spectra. The molecular structure of monocyclic-phosphazene 5 was determined by X-ray diffraction techniques for further structural assignment. It crystallizes in the monoclinic space group P21/m with a = 6.144(2), b = 17.079(9), c = 13.181(9) Å, β= 92.79(7), and Z = 2, R = 0.074. Compound 5 is on a crystallographic mirror plane, and there is only a half molecule in the asymmetric unit. © 1996 John Wiley & Sons, Inc. |
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