SYNTHESES AND STRUCTURES OF 6-MEMBERED CY CLOMETALLAPHOSPHAZENES CONTAINING TELLURIUM(IV) AND RHENIUM(VII)

The reactions of the tridentate ligands (Me3Si)2NC(4-RC6H4)NPPh2NSiMe3 [(1): R=H, (2): R=CF3] with Re2O7 Yield the six-membered rings (4-RC6 H4CNPPh2NReO2N)2 [(3): R=H, (4): R=CF3]. The acyclic compound Me3SiNC( 4-CF3C6H4)NPPh2NReO2OSiMe3 (5) has been obtained by reaction of 2 with Me3SiOReO3. 2 reacts quantitatively with TeCl4 to form the metallacyc le 4-CF3C6H4CNPPh2NTeClN.pyridine (6).pyridine. The molecular structur es of 4.CH2Cl2 and 6.pyridine.0.5 toluene have been determined by X-ra y diffraction.