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Reaction of active methylene compounds (2,4-pentanedione, dimedone, 4-hydroxycoumarin, 4-hydroxycarbostyriles) with triethyl orthoformate and primary amines (aniline, o-methylmercapto aniline, cyclohexylamine) yields substituted aminomethylen-1.3-dicarbonyles (1-5), which in their tautomeric form (B) give stable, deeply coloured Cu··- and Ni- --organic complexes (6-27). The same chelates may also be obtained by direct reaction of orthoformate, amine and active methylene in the presence of the metal acetate at 40-50 °C in 65-90% yield.

zeitschrift für naturforschung b

Zur Reaktivität von C=N-Doppelbindungssystemen, XII 1  über Kupfer(II)- und Nickel(II)-Komplexe von Aminomethylen-1.3-dicarbonylverbindungen / The Reactivity of the C=N-Double Bond System, XII 1  Copper(II) and Nickel(II) Complexes of Aminomethylen-1,3-dicarbonyl Compounds