Chemical properties of ylidene derivatives of azines. 4. Structures of the products of protonation and transformation of dihydroazinylidenecyanoacetic esters in concentrated sulfuric acid

Chemical properties of ylidene derivatives of azines. 4. Structures of the products of protonation and transformation of dihydroazinylidenecyanoacetic esters in concentrated sulfuric acid Full article

Journal

Chemistry of Heterocyclic Compounds
ISSN: 0009-3122 , E-ISSN: 1573-8353

Output data

Year: 1990, Volume: 26, Number: 7, Pages: 801-807 Pages count : DOI: 10.1007/BF00509712

Authors

Oleinik I. V. , Zagulyaeva O. A. , Denisov A. Yu. , Mamaev V. P.

Affiliations

1	(Scopus) Novosibirsk Institute of Organic Chemistry, Siberian Branch, Academy of Sciences of the USSR, Novosibirsk, 630090, Russian Federation

It was demonstrated by UV and 13C NMR spectroscopy that in concentrated sulfuric acid ylidene derivatives of dihydropyridine (Ia) and dihydropyridazine (IIa) have aromatic structures Ib and IIb, while derivatives of dihydropyrimidines IIIa and IVa, dihydropyrazine Va, and dihydro-s-triazine VIa retain ylidene structures IIIb-VIb, respectively, which determines their greater stability in these solutions. When solutions of Ib-VIb in 95% H2SO4 were allowed to stand, they were converted to the corresponding azinylmalonic ester monoamides or azinylacetamides, depending on the reaction temperature. © 1991 Plenum Publishing Corporation.

Oleinik I.V. , Zagulyaeva O.A. , Denisov A.Y. , Mamaev V.P.
Chemical properties of ylidene derivatives of azines. 4. Structures of the products of protonation and transformation of dihydroazinylidenecyanoacetic esters in concentrated sulfuric acid
Chemistry of Heterocyclic Compounds. 1990. V.26. N7. P.801-807. DOI: 10.1007/BF00509712 Scopus РИНЦ OpenAlex

Published print:

Jul 1, 1990

Scopus:	2-s2.0-34249926009
Elibrary:	30891424
OpenAlex:	W2321534484

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