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  1. No Access

    Article

    Diazabicycloalkanes with bridgehead nitrogen atoms. 28. Stevens rearrangement of benzodiazabicycloalkenes

    Stevens rearrangement of the benzyl bromides of benzo[b]-1,4-diazabicyclo[2.2.2]octene and benzo[f]-1,5-diazabicyclo[3.2.2]-nonene occurs with expansion of the diazabicyclic fragments to form a mixture of ster...

    S. O. Doronina, A. A. Gall', V. I. Mamatyuk… in Chemistry of Heterocyclic Compounds (1993)

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    Article

    Diazobicycloalkanes with bridgehead nitrogen atoms in nodal positions. 22. Conformational analysis of benzodiazabicycloalkenes. Iterative evaluation of spectral and thermodynamic parameters

    1H and 13C NMR were used to investigate the conformational equilibrium of benzo[f]-1,5-diazabicyclo[3,2.2]nonene and benzo[g]-1,6-diazabicyclo[4.2.2]decene in solution at temperatures from 20 to–110‡C. Benzo[f]-...

    G. E. Sal'nikov, A. A. Gall', G. V. Shishkin… in Chemistry of Heterocyclic Compounds (1991)

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    Article

    Diazabicycloalkanes with bridging nitrogen atoms. 23. Synthesis and properties of benzo[f]-1,5-diazabicyclo[3.2.2]nonen-3-ol

    Intramolecular cyclization 1-(2-hydroxyethyl)-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-3-ol gives benzo[f]-1,5-diazabicyclo[3.2.2]nonen-3-ols. Further treatment with acetic anhydride gives their 3-acetyl deriva...

    S. O. Doronina, A. A. Gall', G. V. Shishkin… in Chemistry of Heterocyclic Compounds (1991)

  4. No Access

    Article

    13C-13C spin-spin coupling constants in six-membered ring azaaromatic compounds

    The 13C-{1H} NMR spectra of monomethyl substituted diazines, protonated at the picoline and 2-methylopyrimidine nitrogen atoms, have been analyzed, along with that of pyridine N-oxide and its 2-methyl derivatives...

    A. Yu. Denisov, V. I. Mamatyuk, O. P. Shkurko in Chemistry of Heterocyclic Compounds (1988)

  5. No Access

    Article

    The NMR spectra of cyclic nitrones. 3. Effect of protonation and a hydrogen bond on the chemical shifts in the13c NMR spectra of derivatives of 3-imidazoline 3-oxide

    The effect of solvents on the13C NMR spectra of the cyclic nitrones of 3-imidazoline 3-oxide derivatives was studied. It was shown that in solvents capable of forming hydrogen bonds with the N-oxide group the sig...

    I. A. Grigor'ev, V. I. Mamatyuk, G. I. Shchukin… in Chemistry of Heterocyclic Compounds (1986)

  6. No Access

    Article

    13C-13C spin-spin coupling constants in the spectra of monosubstituted pyridines

    The 13C- {1H} NMR spectra of pyridine and a number of monosubstituted pyridines for compounds with the natural percentage of the 13C isotope were analyzed. The direct, geminal, and vicinal 13C-13C spin-spin coupl...

    A. Yu. Denisov, V. I. Mamatyuk, O. P. Shkurko in Chemistry of Heterocyclic Compounds (1985)

  7. No Access

    Article

    Additivity of 13C-1H and 1H-1H spin-spin coupling constants in six-membered aromatic nitrogen-containing heterocycles

    We have analyzed proton-coupled 13C NMR and PMR spectra of pyridazine, pyrimidine, pyrazine, 1,3,5-triazine, and 1,2,4-triazine for one-molar solutions of the compounds in DMSO-D6. Comparison of the values obtain...

    A. Yu. Denisov, V. I. Mamatyuk, O. P. Shkurko in Chemistry of Heterocyclic Compounds (1985)

  8. No Access

    Article

    13C NMR spectra of cyclic nitrones. 2. 1- and 4-substituted 2,2,5,5-tetramethyl-3-imidazoline 3-oxides

    The chemical shift of the carbon atom of the nitrone group in the 13C NMR spectra of 3-imidazoline 3-oxides lies in the region of 117–152 ppm and depends on the electronic effect of the substituants at positions ...

    I. A. Grigor'ev, G. I. Shchukin, V. V. Martin… in Chemistry of Heterocyclic Compounds (1985)

  9. No Access

    Article

    13C NMR Spectra of cyclic nitrones. 1. 2-substituted 4-methyl- and 4-phenyl-1-hydroxy-5,5-dimethyl-3-imidazoline 3-oxides

    The introduction of an N-oxide oxygen atom into azomethines leads to an upfield shift of the signals for the carbon atom of the G=N group in the 13C NMR spectra by 30–33 ppm. This is consistent with the increase ...

    I. A. Grigor'ev, V. V. Martin, G. I. Shchukin… in Chemistry of Heterocyclic Compounds (1985)

  10. No Access

    Article

    Chemical properties of ylidene derivatives of azines. 2. The methylation of dihydropyrimidinylidenecyanoacetic esters and their anions

    The methylation of dihydropyrimidinylidenecyanoacetic esters by various methylating reagents leads to better yields when anions of ylidene derivatives of pyrimidine are used. The structure of the products of N...

    O. A. Zagulyaeva, O. A. Grigorkina, V. I. Mamatyuk… in Chemistry of Heterocyclic Compounds (1984)

  11. No Access

    Article

    Proton-coupled 13C NMR spectra of 2- and 3-substituted pyridines

    The proton-coupled 13C NMR and PMR spectra of pyridine and the 2- and 3-monosubstituted pyridines NC5H4X [where X=CH3, CN, COCH3, COOCH3, N(CH3)2, NO2, OCH3, Cl, or Br] for one-molar solutions of the compounds in...

    A. Yu. Denisov, V. I. Mamatyuk, O. P. Shkurko in Chemistry of Heterocyclic Compounds (1984)

  12. No Access

    Article

    Spin-spin coupling constants of 13C-1H and 1H- 1H in 4-substituted pyridines

    The spin-spin coupling constants (SSCC) of 13C-1H and 1H-1H in 4-substituted pyridines, C5H4NX [X=,CN, COCH3, COOCH3, N(CH3)2, NO2, OCH3, Cl, Br], were investigated. To determine the constants, the proton-coupled...

    A. Yu. Denisov, V. I. Mamatyuk, O. P. Shkurko in Chemistry of Heterocyclic Compounds (1984)

  13. No Access

    Article

    Chemical properties of ylidene derivatives of azines. 1. Structure of the products of protonation of dihydro-2-pyrimidylidene- and dihydro-4-pyrimidylidenecyanoacetic esters

    The structure of the products of protonation of dihydro-2-pyrimidylidene- and dihydro-4-pyrimidylidenecyanoacetic esters was investigated by means of IR, UV, and 1H and 13C NMR spectroscopy. It is shown that, in ...

    O. A. Zagulyaeva, O. A. Grigorkina, V. I. Mamatyuk… in Chemistry of Heterocyclic Compounds (1982)

  14. No Access

    Article

    Pyrimidines LXI. Synthesis of N-pyrimidinylanthranilic acids and 2, 4-diarylpyrimido[2,1-b]quinazol-6-ones

    N-(4,6-Diarylpyrimidinyl)anthranilic acids, obtained by condensation of the appropriate 2-chloropyrimidines with anthranilic acid, are converted to 2,4-diarylpyrimido[2,1-b] quinazol-6-ones when they are treat...

    V. F. Sedova, V. I. Mamatyuk, V. A. Samsonov… in Chemistry of Heterocyclic Compounds (1977)