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  1. No Access

    Article

    Photochemistry of 1-amino-2,4,6-triphenylpyridinium perchlorate

    V. M. Faigel'man, Ya. R. Tymyanskii, N. I. Makarova… in Chemistry of Heterocyclic Compounds (1988)

  2. No Access

    Article

    Reactions of heterocyclic cations with N-containing nucleophiles. 16. Study of the interaction of 2,6-diphenylpyrylium perchlorate with diazoles

    The direct interaction of 2,6-diphenylpyrylium perchlorate with pyrazoles and pyrazolones led to the synthesis of 4-azolylpyrylium salts, which readily cleave a molecule of perchloric acid in the case of the N...

    Yu. A. Zhdanov, é. A. Zvezdina, S. M. Statsenko… in Chemistry of Heterocyclic Compounds (1987)

  3. No Access

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    Reactions of heterocyclic cations with n-containing nucleophiles. 15. Reaction of 2,6-diphenylpyrylium perchlorate with semi- and thiosemicarbazides

    The reaction of 2,6-diphenylpyrylium perchlorate with semi- and thiosemicarbazides in ethanol leads to 1-carbamoyl- and 1-thiocarbamoyl-3-phenyl-5-phenacyl-4,5-dihydropyrazoles, the cyclization of which yields...

    é. A. Zvezdina, M. P. Zhdanova, O. S. Anisimova… in Chemistry of Heterocyclic Compounds (1986)

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    Article

    Pharmacological properties of pyridinium salts, pyrazolines, and pyrazoles

    É. A. Zvezdina, M. P. Zhdanova, I. I. Nechayuk… in Pharmaceutical Chemistry Journal (1986)

  5. No Access

    Article

    Reactions of heterocyclic cations with N-containing nucleophiles. 14. Recyclization of 2,6-diphenylpyrylium perchlorate under the influence of nucleophiles with an N-C-N fragment

    The recyclization of 2,6-diphenylpyrylium perchlorate under the influence of isothioureas, guanidine, 2-aminobenzimidazoles, 2-aminonaphth[1,2-d]imidazole, 2-aminothiazole, 2-aminobenzothiazole, and 2-aminopyr...

    É. A. Zvezdina, M. P. Zhdanova, I. I. Giryavenko in Chemistry of Heterocyclic Compounds (1983)

  6. No Access

    Article

    Reactions of heterocyclic cations with N-containing nucleophiles. 13. Investigation of the reaction of 2,4,6-triarylpyrylium salts with hydrazines, semicarbazide, and thiosemicarbazide

    The recyclization reactions of 2,4,6-triphenylpyrylium perchlorate with hydrazine and methyl-, phenyl-, benzoyl-, and benzalhydrazines in dimethylformamide (DMF), which proceed differently than in ethanol, wer...

    É. A. Zvezdina, M. P. Zhdanova, O. S. Anisimova… in Chemistry of Heterocyclic Compounds (1983)

  7. No Access

    Article

    Synthesis of 4-(4-pyrazolyl)-substituted pyrylium salts and pyridines

    A. N. Popova, S. M. Statsenko, É. A. Zvezdina in Chemistry of Heterocyclic Compounds (1982)

  8. No Access

    Article

    Reactions of heterocyclic cations with nitrogen-containing nucleophiles. 10. Synthesis of 3,5,7-triaryl-1,2-oxazepinium perchlorates by the reaction of 2,4,6-triarylpyrylium salts with nitrones and substituted hydroxylamines

    2-Substituted 3,5,7-triaryl-1,2-oxazepinium perchlorates were obtained by the reaction of 2,4,6-triarylpyrylium salts in dimethylformamide with nitrones and N-arylhydroxylamines. The products are the first rep...

    É. A. Zvezdina, O. M. Golyanskaya, I. M. Andreeva… in Chemistry of Heterocyclic Compounds (1982)

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    Article

    Reactions of heterocyclic cations with nitrogen-containing nucleophiles. 12. Reaction of pyrylium salts with azomethines

    The reaction of pyrylium salts with azomethines leads to the formation of styrylpyrylium, styrylpyridinium, and 4-arylbenzylaminopyrylium salts. The reaction of the latter with ammonia and amines gave pyridine...

    É. A. Zvezdina, A. N. Popova, G. N. Dorofeenko in Chemistry of Heterocyclic Compounds (1982)

  10. No Access

    Article

    Reactions of heterocyclic cations with nitrogen-containing nucleophiles. 11. Reaction of 2,6-diphenylpyrylium perchlorate with primary amines, hydrazine, and hydroxylamine

    The reaction of 2,6-diphenylpyrylium perchlorate with methylamine and various anilines in acetic acid leads to pyridinium salts; 3,4-bispyridinium perchlorates were obtained in dimethylformamide. The reaction ...

    É. A. Zvezdina, A. N. Popova, A. I. Pyshchev… in Chemistry of Heterocyclic Compounds (1982)

  11. No Access

    Article

    Synthesis of pyrimidine derivatives by reaction of pyrylium salts with guanidine and compounds of the guanidine series

    2,4,6-Triphenylpyrylium perchlorate reacts with methylguanidine to give 1-methyl-2-amino-4,6-diphenylpyrimidinium perchlorate, which undergoes the Dimroth rearrangement to give 2-methylamino-4,6-diphenylpyrimi...

    É. A. Zvezdina, M. P. Zhdanova, G. N. Dorofeenko in Chemistry of Heterocyclic Compounds (1980)

  12. No Access

    Article

    Synthesis of pyrimidine derivatives by reaction of pyrylium salts with guanidine and compounds of the guanidine series

    2,4,6-Triphenylpyrylium perchlorate reacts with methylguanidine to give 1-methyl-2-amino-4,6-diphenylpyrimidinium perchlorate, which undergoes the Dimroth rearrangement to give 2-methylamino-4,6-diphenylpyrimi...

    É. A. Zvezdina, M. P. Zhdanova, G. N. Dorofeenko in Chemistry of Heterocyclic Compounds (1980)

  13. No Access

    Article

    Antimicrobial activity of some pyridinium salts and compounds of the pyrimidine series

    É. A. Zvezdina, M. P. Zhdanova, I. A. Barchan… in Pharmaceutical Chemistry Journal (1980)

  14. No Access

    Article

    Synthesis of pyridine and pyrimidine derivatives by reaction of pyrylium salts with ureas, thioureas, and isothioureas

    2,4,6-Triphenylpyrylium perchlorate is converted to 2,4,6-triphenylpyridine in reactions with urea and N-acetyl- and N,N-dimethylureas, whereas it is converted to 1,2,4,6-tetraphenylpyridinium perchlorate on r...

    é. A. Zvezdina, M. P. Zhdanova, G. N. Dorofeenko in Chemistry of Heterocyclic Compounds (1979)

  15. No Access

    Article

    Synthesis and properties of N-hetarylpyridinium salts

    Methods for the synthesis of N-hetarylpyridinium perchlorates are examined. The basicity constants of a number of the indicated compounds were measured. It is shown that 2,4,6-trimethyl- and 2,4,6-triphenylpyr...

    É. A. Zvezdina, M. P. Zhdanova, V. A. Bren'… in Chemistry of Heterocyclic Compounds (1978)

  16. No Access

    Article

    Reaction of pyrylium salts with amidines

    2,4,6-Substituted pyrimidines were obtained by reaction of 2,4,6-triarylpyrylium perchlorates with amines. 2,4-Substituted pyrimidines were similarly synthesized from 2,6-diphenylpyrylium perchlorate.

    M. P. Zhdanova, É. A. Zvezdina, G. N. Dorofeenko in Chemistry of Heterocyclic Compounds (1978)

  17. No Access

    Article

    Reaction of methyl-substituted pyrylium salts with tertiary amines

    2,4,6-Trimethylpyrylium perchlorate reacts with heterocyclic compounds containing apyridine nitrogen atom and having basicities higher than 9 pKa units (in acetonitrile) through a step involving the formation of ...

    É. A. Zvezdina, M. P. Zhdanova, V. A. Bren… in Chemistry of Heterocyclic Compounds (1976)

  18. No Access

    Article

    Basicities and transformations of pyrylium and pyridinium salts containing p-aminophenyl substituents

    On the basis of the measured basicity constants of pyrylium and pyridinium salts containing p-aminophenyl substituents it is shown that the positive charge in the pyrylium cation is considerably higher than in...

    É. A. Zvezdina, V. V. Derbenev, V. A. Bren… in Chemistry of Heterocyclic Compounds (1976)

  19. No Access

    Article

    Fifth Symposium on the Chemistry of Heterocyclic Compounds

    A. D. Garnovskii, S. D. Sokolov, A. F. Oleinik… in Chemistry of Heterocyclic Compounds (1976)

  20. No Access

    Article

    Synthesis of condensed pyrimidine systems based on 2,4,6-triphenylpyrylium perchlorate

    1,3-Diphenylpyrimido[1,2-a]benzimidazolium perchlorates were obtained by reaction of 2,4,6-triphenylpyrylium perchlorate with 2-aminobenzimidazoles.

    É. A. Zvezdina, M. P. Zhdanova, A. M. Simonov… in Chemistry of Heterocyclic Compounds (1975)

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