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Tautomerism of derivatives of azines. 19. Effect of solvents on the o,p-quinoid equilibria of the ylidene forms of 4-pyrimidinylcyanoacetic acid esters

โœ Scribed by O. P. Petrenko; I. K. Korobeinicheva; V. V. Lapachev; V. P. Mamaev


Publisher
Springer US
Year
1988
Tongue
English
Weight
335 KB
Volume
24
Category
Article
ISSN
0009-3122

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Chemical properties of ylidene derivativ
โœ I. V. Oleinik; O. A. Zagulyaeva; A. Yu. Denisov; V. P. Mamaev ๐Ÿ“‚ Article ๐Ÿ“… 1990 ๐Ÿ› Springer US ๐ŸŒ English โš– 582 KB

It was demonstrated by UV and 13C NMR spectroscopy that in concentrated sulfuric acid ylidene derivatives of dihydropyridine (Ia) and dihydropyridazine (lla) have aromatic structures Ib and lIb, while derivatives of dihydropyrimidines Ilia and IVa, dihydropyrazine Va, and dihydro-s-triazine Via reta