- TAUTOMERISM OF AZINE DERIVATIVES. 4. KETO-ENOL TAUTOMERISM OF β-KETO ESTERS OF THE AZINE SERIES
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The structures of pyrazinoyl-, 3-pyridazinoyl-, 4-pyrimidoyl-, and 2-, 3-, and 4-pyridoylacetic esters were studied by means of IR, NMR, and 1H and 13C NMR spectroscopy and quantum-chemical calculations (Pariser-Parr-Pople and CNDO/2).The effect of solvents (including strongly and weakly basic solvents) on the position of the tautomeric equilibria of these β-keto esters was studied.The ?+ constants for the keto and enol fragments were estimated by means of quantum-chemical calculations and 13C NMR spectroscopy.
- Stekhova, S. A.,Zagulyaeva, O. A.,Lapachev, V. V.,Mamaeva, V. P.
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