TAUTOMERISM OF AZINE DERIVATIVES. 4. KETO-ENOL TAUTOMERISM OF β-KETO ESTERS OF THE AZINE SERIES

Article abstract of DOI:10.1007/BF00553708

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.