Organometallic chemistry of vanadium(III) based on the vanadium-dibenzotetramethyltetraaza(14)annulene moiety: synthesis, structural studies by X-ray and H NMR spectroscopy, and reactivity of vanadium-carbon functionalities

The addition of lithiated tmtaaH2 to a solution of VCl3(THF)3 results in the synthesis of (V tmtaa Cl) which serves as a source for vanadium complexes with lower oxidation states. Subsequent introduction of Grignard reagents leads to the alkylation of the vanadium derivative to (V tmtaa R) compounds, wherein R represents Me, Ch2Ph, Ph and 2,4,6-Me3C6H2. Similarly, the metal-oxo (VO tmtaa) can also act as starting material for the preparation of organometallic derivatives. The structural conformations of (V tmtaa Cl), (V tmtaa Ph) and (V tmtaa 2,4,6-Me3C6H2) are examined using X-ray analysis and H NMR spectroscopy.