Journal fur Praktische Chemie - Chemiker-Zeitung p. 368 - 370 (1993)
Update date:2022-08-05
Topics:
Hennig, L.
Mann, G.
Schellenberg, C.
Franke, K.
The reaction of azomethine dyes (1a-g) with malonodinitrile (2) gives dicyanomethylene-pyrazolin-5-one (4) which immediately reacts with the eliminated anilines by HCN-amine exchange giving the deeply coloured arylamino-cyanomethylene-pyrazolinones (5a-g).Structural investigations and a study of the absorption characteristic are described.
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