ISSN:
1434-4475
Keywords:
Dicyanomethylene-pyrazolinones
;
Chromophoric properties
;
13C-and15N-Data
;
INDO/S-CI Calculations
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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 ε-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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00810108
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