Dicyanmethylenpyrazolinone und deren Bedeutung als Chromophor. Synthesen mit Nitrilen, 80. Mitt.

H Junek, M Klade, H Sterk, W Fabian

Index: Junek, Hans; Klade, Manfred; Sterk, Heinz; Fabian, Walter Monatshefte fuer Chemie, 1988 ,  vol. 119, p. 993 - 1010

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Citation Number: 17

Abstract

Abstract 1-Phenyl-2-pyrazolin-5-ones 1 a–e react with tetracyanoethylene forming the corresponding dicyanomethylenepyrazolin-5-ones 2 a–e. The products are deeply coloured with absorption bands between 550 and 650 nm, but low ε-values and negative solvatochromic effect. By amine-HCN exchange reaction with anilines the red-coloured phenylamino-cyanomethylene-pyrazolinones 3–6 are obtained. 15 N-and 13 C-NMR-data ...