TAUTOMERISM OF DERIVATIVES OF AZINES. 16. TAUTOMERISM OF ACYLMETHYLPYRAZINES AND -QUINOXALINES
The tautomeric equilibria of acylmethylpyrazines and -quinoxalines in chloroform were studied by 1H, 14N, and 17O NMR spectroscopy.It was shown that keto-enol tautomerism is realized in the acylmethylpyrazine series.Annelation leads to the development of an ylidene tautomer in the acylmethylquinoxaline series.A marked dependence of the position of the intrachelate equilibrium on the character of the solvent was observed.
Mainagashev, I. Ya.,Lapachev, V. V.,Fedotov, M. A.,Mamaev, V. P.
p. 1339 - 1342
(2007/10/02)
A Facile Synthesis of (2-Oxo-1,2-dihydroquinoxalin-3-yl)-methyl Ketones and (Quinoxalin-2-yl)-methyl Ketones
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Nikam, S. S.,Sahasrabudhe, A. D.,Shastri, R. K.,Ramanathan, S.
p. 145 - 147
(2007/10/02)
Syntheses of 2-(2-Quinoxalyl)-1-phenylethanone and Related Ethanones
Nine 2-(2-quinoxalyl)-1-phenylethanones were synthesized by the condensation of 2-methylquinoxaline and the requisite methyl benzoate ester with sodium hydride as the condensing agent.Substituents in the 3 or 4 positions of the phenyl ring were methyl, methoxy, chloro, or trifluoromethyl.
Sund, Eldon H.,Callender, David L.
p. 189
(2007/10/02)
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