| Autor: |
Afonin, A. V., Voronov, V. K., Domnina, E. S., Es'kova, L. A., Baikalova, L. V., Trzhtsinskaya, B. V., Enikeeva, E. I., Vashchenko, A. V. |
| Zdroj: |
Chemistry of Heterocyclic Compounds; August 1991, Vol. 27 Issue: 8 p845-848, 4p |
| Abstrakt: |
The factors that affect the chemical shifts in the 15N NMR spectra of N-vinylazoles were investigated. It was shown that an additional positive contribution to the shielding constant of the “pyridine” nitrogen atom occurs in the s-cis-(N(2)) conformation of N-vinylpyrazoles due to overlapping of the electron cloud of its unshared electron pair and the s-orbital of the vinyl group hydrogen ?-cis-atom. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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