Dicyanmethylenpyrazolinone und deren Bedeutung als Chromophor. Synthesen mit Nitrilen, 80. Mitt. |
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Authors: | Hans Junek Manfred Klade Heinz Sterk Walter Fabian |
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Affiliation: | (1) Institut für Organische Chemie, Abteilung für Angewandte Organische Chemie, Karl-Franzens-Universität, A-8010 Graz |
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Abstract: | 1-Phenyl-2-pyrazolin-5-ones1 a–e react with tetracyanoethylene forming the corresponding dicyanomethylenepyrazolin-5-ones2 a–e. The products are deeply coloured with absorption bands between 550 and 650 nm, but low -values and negative solvatochromic effect. By amine-HCN exchange reaction with anilines the red-coloured phenylamino-cyanomethylene-pyrazolinones3–6 are obtained.15N- and13C-NMR-data of2 and quantum-chemical calculations (INDO/S-CI) reveal the extreme polarization and chromophoric properties of the described dicyanomethylene-pyrazolinones. |
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Keywords: | Dicyanomethylene-pyrazolinones Chromophoric properties 13C-and15N-Data INDO/S-CI Calculations |
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