Abstract
The 4-pyrazoline-3-one1 reacts with 4-dimethylaminobenzaldehyde to yield the stable asymmetric cyanine dye2b which reacts with1 to give the colorless (aryl) (dipyrazolyl) methane3b. Using aldehydes with less cationstabilizing groups the polymethines2 are not isolated but only the methanes3. The structures of2b and3 are discussed by1 H,13C and Hetero NMR spectra.
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Literatur
Pindur U., Arch. Pharm. (Weinheim)313, 301 (1980).
Privatmitteilung (13C-NMR-Spektroskopie)R. Matusch, Universität Marburg.
Brooker L. G. S., J. Amer. Chem. Soc.73, 1087 (1951); ibid.67, 1881 (1945); Frontiers in Chemistry, Vol. III, S. 102. New York: Interscience. 1945.
Kokkinos K., Markopoulos C., J. Prakt. Chem.322, 543 (1980).
Jost R.,Pimmelin P.,Sommer J. M., J. Chem. Soc. D1971, 879.
Analoge DNMR-Phänomene siehe:Kessler H.,Rieker A., Tetrahedron Lett.1966, 5257; Tetrahedron24, 5133 (1968).
Levy G. C., Lichter R. L., Nitrogen-15 Nuclear Magnetic Resonance Spectroscopy. New York: John Wiley. 1979.
Akgün E.,Pindur U., unveröff. Ergebnisse.
Trofimov N. V., Kanaev N. A., Busev A. I., Nenning P., Z. Chem.21, 410 (1981).
Burschka Ch.,Akgün E.,Pindur U., Z. Naturforsch. B, im Druck.
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Akgün, E., Kämpchen, T. & Pindur, U. Darstellung und Struktur von Pyrazolyl-Kationen mit Polymethin- und Methan-Gerüst. Monatsh Chem 114, 219–225 (1983). https://doi.org/10.1007/BF00798325
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DOI: https://doi.org/10.1007/BF00798325