The reaction of (CF3)2P(CI)=NSiMe3 and Me3SiN=VCI3 in CH2CIz leads t o volatile [(CF3)2PN]zNVC12; the X-ray structure analysis shows a planar six-mem bered NVNPNP-ring with C2" molecular symmetry.

Syntheses and Structures of Cyclic and Acyclic Compounds Containing Vanadium(V) and Molybdenum(V1)The reaction of (CzF5)2P(C1) = NSiMe3 (2) with C13V = NSiMe, in CHzClz yields the eight-membered ring [(C2F5) SiMe3I4 (6) and (CF,),P(CI) = N -MoOCl, (7), respectively. The molecular structures of 3, 5, and 6 have been determined by X-ray diffraction.Seit einigen Jahren beschaftigen wir uns rnit der Synthese von sechs-und achtgliedrigen ungesattigten anorganischen Ringsystemen, in denen einzelne Heteroatome durch Ubergangsmetalle substituiert sind. 1986 beschrieben wir den ersten sechsgliedrigen Wolfram-haltigen Phosphazenring'). Danach haben wir uber entsprechende Vanadium-, Niob-, Molybdan-und Rhenium-haltige Verbindungen berichtet ' 1.

Me3SiOPPh2NSiMe3 (1) reacts with NbCl5 and CpTiCl3 to form the eight-membered ring compounds [Ph2PNONbCl3]2 (2) and [Ph2PNOTiClCp]2 (3). The reaction of (C2F5)2P(Cl)=NSiMe3 (4) with MoO2Cl2 and MoOCl4 in CH2C12 quantitatively yields the compounds [MoOCl3-O-P(C2F5)2=NSiMe3]4 (5) and (C2F5)2P(Cl)=N-MoOCl3 (6).Through recrystallization from MeCN, compound 2 has been isolated and characterized by means of X-ray analysis as the MeCN adduct 2 a.

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