| Autor: |
Maguet, Michel, Baccon, Michel Le, Poirier, Yves, Guglielmetti, Robert |
| Zdroj: |
Canadian Journal of Chemistry; November 1982, Vol. 60 Issue: 21 p2644-2653, 10p |
| Abstrakt: |
Heterocycloimmonium salts generally react with 3-methoxy 5-nitro salicylaldéhyde to give spirochromenes or merocyanines. Only the latter compounds are obtained in the thiazolinic and the benzimidazolinic series. The linking of a paraffinic ring to the merocyanines allows their 13C nmr study. The comparison of their spectra with those of heterocycloimmonium salts stresses a hyperconjugative effect in the thiazolinic and the benzimidazolinic series. The benzoxazolinic series appears to be in an intermediate position: the thermodynamic stabilities of spirochromenes and merocyanines are quite similar. The limiting value of the chemical shift of the carbon atom involved in the spiroannellation of merocyanines, can be approximately determined. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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