The electron paramagnetic resonance (epr) spectra of a series of copper(I1) and oxovanadium(1V) complexes oriented in nematic glasses formed from liquid crystals have been measured. Data are presented which show that anisotropic epr parameters obtained by this convenient, easily interpreted technique compare favorably with published values obtained by dilute single crystal procedures. The results are substantially better than data obtained from randomly oriented frozen solutions or powders. The applicability of available theories concerned with the order present in liquid crystal solutions is discussed as it relates to the precision of the epr parameters. As an illustration of the usefulness of the technique, epr parameters are obtained for ten copper(I1) and seven oxovanadium-(IV) metal-organic complexes. Molecular orbital coefficients are calculated for the copper(I1) species.ingle-crystal electron paramagnetic resonance (epr)(1) Abstracted in part from the thesis of J. D. L. submitted in partial fulfillment for the Ph.D. degree in 1970 at Case Western Reserve University.(2) (a) B. R. McGarvey, Transition Metal Chem., 3, 89 (1966), and references cited therein; (b) M. J. Weeks and J. P. Fackler, Inorg.

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3‐Oxo‐vincadifformin (I) reagiert mit 1,2 Äquival.

(i)‐E‐Homovincamonoxim (i)‐(Ia) wird mit SOCI, nach Beckmann in das Amid (i)‐(II) umgelagert, das durch sukzessive Behandlung mit KOH und HCl unter Ringverengung in (i)‐Vincamon (i)‐(IIIa) übergeht.

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