Tautomerism of azine derivatives. 4. Keto-enol tautomerism of β-keto esters of the azine series |
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| Authors: | S A Stekhova O A Zagulyaeva V V Lapachev V P Mamaeva |
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| Institution: | (1) Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR, 6300090 Novosibirsk |
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| Abstract: | The structures of pyrazinoyl-, 3-pyridazinoyl-, 4-pyrimidoyl-, and 2-, 3-, and 4-pyridoylacetic esters were studied by means
of IR, NMR, and1H and13C 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 o+ constants for the keto and enol fragments were estimated by means of quantum-chemical calculations and13C NMR spectroscopy.
See 1] for communication No. 3.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 822–826, June, 1980. |
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