2- Pentanone, 4-imino- acetylacetone

With this method, highly basic conditions no longer exist, an amine-exchange reaction does not occur, and contamination with anions is avoided. An incidental asset is that the two metal derivatives involved usually have different colors, and the extent of reaction can be judged visually. An obvious disadvantage is that the equilibrium may be unfavorable, as was described for the attempted reaction of bis(4-imino-2-pentanonato)copper(II) and 4,4 -tri-methylenedinitrilo)di-2-pentanone [bis(acetylacetone)tri-methylenediimine]. For successful isolation of a pure product, the metal derivative must be the most insoluble species present often, this condition is met. 

Bi s (2,4-pentanedionato) oxovanadium (I V) [vanadium-(IV) oxy(acetylacetonate)] has been prepared by direct reaction of 2,4-pentanedione and vanadium(V) oxide. By using the same method, bis(4-imino-2-pentanonato)oxo-vanadium(IV) has been prepared by substituting acetyl-acetone imide (4-imino-2-pentanone) for acetylacetone. ... 

This reaction is analogous to the preparation of bis(4-imino-2-pentanonato)copper(II) [bis(4-amino-3-penten-2-onato)copper(II)] described by Holtzclaw, Collman, and Alire, and it consists in mixing an ethanolic solution of the -keto imine ( -imino ketone) with an ammoniacal metal salt solution. Advantages of this technique are the simplicity of preparation and the fact that acetylacetone imide (4-imino-2-pentanone) can be purchased. The product is useful as a starting material in ligand-exchange reactions. 

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