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Общее количество найденных документов : 52
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1.
Инвентарный номер: нет.
   
   E 43


   
    Electrochemical modeling of the dehydrogenation of heterocycles. Oxidation of 3,4-dihydro-2-quinoxalinone derivatives [Electronic resource] / I. M. Sosonkin, G. N. Strogov, V. N. Charushin, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1981. - Vol. 17, № 2. - P195-197. - Bibliogr. : p. 197 (14 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
DEHYDROGENATION -- HETEROCYCLES -- ELECTROCHEMICAL OXIDATION
Аннотация: A study of the electrochemical oxidation of 3,4-dihydro-2-quinoxalinone derivatives on a rotating platinum disk electrode with a ring showed that their reduction includes the successive detachment of two electrons and two protons

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1981, v.17, N 2, p.195.pdf
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2.
Инвентарный номер: нет.
   
   C 47


    Charushin, V. N.
    Cyclizations of N-Alkylazinium Cations with Bisnucleophiles. One-step Route to Furo[2,3-b]quinoxalines [Electronic resource] / V. N. Charushin, O. N. Chupakhin, A. I. Rezvukhin // Heterocycles. - 1981. - Vol. 16, № 2. - P195-198
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
N-ALKYLQUINOXALINLUM SALTS -- BETA-DIKETONES
Аннотация: N-Alkylquinoxalinium salts react with anions of β-diketones at a temperature below 20°C to yield endo-furo[2,3-b]quinoxalines.

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3.
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   D 62


   
    Direct annelation of six-membered heterocycles with a quinoxaline ring [Electronic resource] / O. N. Chupakhin, V. N. Charushin, M. G. Ponizovskii, L. M. Naumova // Chemistry of Heterocyclic Compounds. - 1984. - Vol. 20, № 5. - P575-576. - Bibliogr. : p. 576 (2 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
QUINOXALINES -- HETEROCYCLES

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1984, v.20, N 5, p. 575.pdf
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4.
Инвентарный номер: нет.
   
   A 67


   
    Application of 1H and 13C NMR to the structural elucidation of tetrahydroquinoxalines condensed with five-membered heterocycles [Electronic resource] / V. N. Charushin, A. I. Chernyshev, N. N. Sorokin, O. N. Chupakhin // Organic Magnetic Resonance. - 1984. - Vol. 22, № 12. - P775-778. - Bibliogr. : p. 778 (22 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
N-METHYLTETRAHYDROQUINOXALINES -- PYRROLE -- IMIDAZOLE
Аннотация: 1H and 13C NMR spectral data for 21 N-methyltetrahydroquinoxalines annelated with furan, pyrrole, imidazole or thiazole rings are reported. Unambiguous assignments of the ring junction 13C resonances were made on the basis of selective decoupling experiments and with the aid of one-bond and long-range 13C–1H coupling constants. The effects of five-membered heterocycles on the 1H and 13C chemical shifts of the ring junction hydrogen and carbon atoms are considered. Values of one-bond 1J(CH) and vicinal 3J(HH) coupling constants between the ring junction protons are also discussed as a diagnostic means for structural elucidation of tetrahydroquinoxalines condensed with five-membered heterocycles.

\\\\expert2\\nbo\\Organic Magnetic Resonance\\1984. V. 22, N 12. P. 775.pdf
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5.
Инвентарный номер: нет.
   
   C 47


    Charushin, V. N.
    Cyclization of azines with bifunctional nucleophiles — a one-step route to condensed heterocycles (review) [Electronic resource] / V. N. Charushin, M. G. Ponizovskii, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 8. - С. 839-853. - Bibliogr. : p. 851-853 (115 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BIFUNCTIONAL REAGENTS -- HETEROCYCLES
Аннотация: Nucleophilic diaddition and disubstitution in the azine. series with the participation of bifunctional reagents, the result of which is the formation of condensed heterocycles, were examined.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1985, v.21, N 8, p. 839.pdf
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6.
Инвентарный номер: нет.
   


   
    1H and 13C NMR spectra of tetrahydroquinoxalines condensed with six-membered heterocycles [Electronic resource] / V. N. Charushin, N. N. Sorokin, A. I. Chernyshev, V. G. Baklykov, M. G. Ponizovskii, O. N. Chupakhin // Magnetic Resonance in Chemistry. - 1986. - Vol. 24, № 9. - С. 777-782. - Bibliogr. : p. 782 (16 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
1H NMR -- 13C NMR -- CONDENSED TETRAHYDROQUINOXALINES
Аннотация: The 1H and 13C NMR spectra of tetrahydroquinoxalines condensed with pyridazine, pyrazine, oxazine, oxadiazine, thiadiazine or triazine rings have been measured in DMSO-d6 solution. The effects of six-membered heterocycles on 1H and 13C chemical shifts and the values of one-bond 1J(CH) and vicinal 3J(HH) coupling constants for the ring junction fragment are considered. The differences between the 1H and 13C spectral parameters of tetrahydroquinoxalines annelated with five- or six-membered heterocycles with the same set of heteroatoms attached to the ring junction carbons are also discussed.

\\\\expert2\\nbo\\Magnetic Resonance in Chemistry\\1986, v.24, N 9, p.777.pdf
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7.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 22. Crystal and molecular structure of tetrahydroquinoxaline condensed with the six-membered 1,3,4-thiadiazine ring [Electronic resource] / D. S. Yufit, Yu. T. Struchkov, V. N. Drozd, V. N. Charushin, V. G. Baklykov, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 5. - С. 583-587. - Bibliogr. : p. 587 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
X-RAY DIFFRACTION -- HYDROGENS -- TETRAHYDROPYRAZINE
Аннотация: X-ray diffraction examination of 4-acetyl-10-methyl-2-phenyl-1,4,4a,5,10,10a-hexahydro-1,3,4-thiadiazino[5,6-b]quinoxaline has shown that the 4a-H and 10a-H hydrogens attached to the carbon atoms common to both heterocycles are cis-oriented, as in the annelation of five-membered heterocycles to the tetrahydropyrazine ring, but in this case the torsion angle H(4a)C(4a)C(10a)H(10a) is much greater, having a value of 60‡

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 5, p. 583.pdf
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8.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 25. Oxidation of tetrahydroquinoxalines condensed with six-membered ring heterocycles [Electronic resource] / V. N. Charushin, L. M. Naumova, M. G. Ponizovskii, V. G. Baklykov, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 9. - С. 1010-1013. - Bibliogr. : p. 1013 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
TETRAHYDROQUINOXALINES -- POTASSIUM PERMANGANATE -- OXIDATION PRODUCTS
Аннотация: Reaction of six-membered ring heterocycle-annulated tetrahydroquinoxalines with potassium permanganate in acetone results in the formation of oxidation products containing a common system of conjugated double bonds.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 9, p. 1010.pdf
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9.
Инвентарный номер: нет.
   
   M 38


   
    Mass spectrometry of nitrogenous heterocycles. 1. Mass spectrometric evaluation of stability of tetrahydropyrazines annelated to five- and six-membered heterocycles [Electronic resource] / N. A. Klyuev, V. G. Baklykov, V. N. Charushin, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1989. - Vol. 25, № 4. - С. 444-450. - Bibliogr. : p. 450 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
TETRAHYDROPYRAZINES -- DISSOCIATION REACTION
Аннотация: Based on a study of electron impact mass spectra of a large number of tetrahydropyrazines, which are joined to five- and six-membered heterocyclic and carbocyclic residues, the trends which characterize the stability of these condensed systems are found. The proposed criteria can be used for evaluation of the chemical stability of these compounds, for example, their propensity toward the reverse dissociation reaction.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1989, v.25, N 4, p. 444.pdf
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10.
Инвентарный номер: нет.
   
   B 39


   
    Behavior of Monocyclic 1,2,4-Triazines in Reactions with C-, N-, O-, and S-Nucleophiles [Electronic resource] / V. N. Charushin, S. G. Alexeev, O. N. Chupakhin, H. C. Van der Plas // Advances in Heterocyclic Chemistry. - 1989. - Vol. 46 (C). - С. 73-142. - Bibliogr. : p. 135-142 (200 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
1,2,4-TRIAZINES -- NITROGEN-CONTAINING HETEROCYCLES
Аннотация: Among the six-membered nitrogen-containing heterocycles the 1,2,4-triazines have attracted the attention of chemists for a long time. This is due to the fact that many 1,2,4-triazine derivatives are biologically active and are used in medicine and agriculture. Moreover, 1,2,4-triazines are of chemical interest. They proved to be very susceptible to attack by all kinds of nucleophiles, leading to the addition, and subsequently either substitution or cyclization, and ring transformation. This continuing and lively interest in this area of heterocyclic chemistry has produced a great number of publications and patent applications. This chapter concentrates on the behavior of monocyclic 1,2,4-triazines in reactions with C-, N-, 0-, and S-nucleophiles, because the important features of general character established for simple 1,2,4-triazines can evidently be applied to other derivatives including condensed 1,2,4-triazines.

\\\\expert2\\nbo\\Advances in Heterocyclic Chemistry\\1988. V. 46 (C). P. 73-142.pdf
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