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Общее количество найденных документов : 17
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 1-10    11-17 
1.

Вид документа : Статья из журнала
Шифр издания : 54
Автор(ы) : Rusinov G. L., Slepukhin P. A., Charushin V. N., Chupakhin O. N.
Заглавие : 2,3-Dichloro-1-alkylpyrazinium tetrafluoroborates: the synthesis and reactions with nucleophiles [Electronic resource]
Место публикации : Mendeleev Communications. - 2001. - Vol. 11, № 2. - С. 78-80
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0959943601707237
Примечания : 12.10.2011
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The alkylation of 2,3-dichloropyrazine with the Meerwein reagents afforded 1-alkyl-2,3-dichloropyrazinium tetrafluoroborates, which were transformed into mono.mono- or disubstitution products, while the reaction of these salts with 1,4-N,Xdinucleophiles resulted in fused heterocyclic systems
\\\\expert2\\nbo\\Mendeleev Communications\\2001, v.11, N 2. p.78.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 54/A 10
Автор(ы) : Layeva A. A., Nosova E. V., Lipunova G. N., Trashakhova T. V., Charushin V. N.
Заглавие : A new approach to fluorinated 4(1H)-quinazolinones
Место публикации : Journal of Fluorine Chemistry. - 2007. - Vol. 128, № 7. - С. 748-754
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A new approach for the synthesis of fluorinated 1H-quinazolin-4-ones and 4-substituted quinazolines has been developed. 6-Fluoro-1H-quinazolin-4-ones were obtained by intramolecular cyclization of fluorine-containing S-ethyl N-benzoylisothioureas. Nucleophilic substitution reactions at positions 2 and 7, as well as alkylation at 1-position of quinazolinones were investigated. In addition, the synthesis of fluorine-containing 4-aminoquinazolines was carried out.
\\\\Expert2\\nbo\\Journal of Fluorine Chemistry\\2007, v.128. p.748.pdf
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3.

Вид документа : Статья из журнала
Шифр издания : 54/A 10
Автор(ы) : Belskaia N. P., Deryabina T. G., Koksharov A.V., Kodess M. I., Lebedev A.T., Bakulev V. A.
Заглавие : A novel approach to fused 1,2,4-triazines by intramolecular cyclization of 1,2-diaza-1,3-butadienes bearing allyl(propargyl)sulfanyl and cyclic tert-amino groups
Место публикации : Tetrahedron Letters. - 2007. - Vol. 48, № 52. - С. 9128-9131
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 3-Allyl- and 3-prop-1-ynylsulfanyl-2-arylazo-3-cycloalkylamino-acrylonitriles undergo cyclization under mild conditions to afford the novel heterocyclic systems 1,4,6,7,8,8a-hexahydropyrrolo[2,1-c][1,2,4]-triazine-4-thione, 1,4,6,7,9,9a-hexahydro-[1,4]oxazino[3,4-c][1,2,4]triazine and 1,6,7,8,9,9a-hexahydro-4H-pyrido[2,1-c][1,2,4]triazine via a number of consecutive pericyclic reactions
\\\\Expert2\\nbo\\Tetrahedron Letters\\2007, v. 48, p.9128.pdf
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4.

Вид документа : Статья из журнала
Шифр издания : 54/B 62
Автор(ы) : Chizhov D. L., Slepukhin P. A., Ovchinnikova I. G., Fedorova O. V., Rusinov G. L., Filyakova V. I., Charushin V. N.
Заглавие : Bis(acetylaryl) podands in the synthesis of fluorine-containing bis(beta-diketones) joined by a polyether spacer [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2010. - Vol. 59, № 11. - С. 2122-2125: рис., табл.
Систем. требования: http://www.springerlink.com/content/g7075u3235l32p22/fulltext.pdf
Примечания : Bibliogr. : p. 2125 (14 ref.). - 28.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: O-Alkylation of 2-acetylphenols with ?,?-dichloro derivatives of oligoethylene glycols in the presence of KOH and Al2O3 in DMF gave the corresponding podands. Their condensation with ethyl trifluoroacetate afforded fluorine-containing bis(?-diketones) with the aryl fragments linked by conformationally flexible polyether spacers
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2010, 59 (11), 2122-2125.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 54/F 70
Автор(ы) : Nosova E. V., Laeva A. A., Trashakhova T. V., Lipunova G. N., Slepukhin P. A., Charushin V. N.
Заглавие : Fluorine-containing quinazolines annulated at the pyrimidine ring [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2009. - Vol. 58, № 6. - С. 1303-1308
Систем. требования: http://www.springerlink.com/content/e37k3p243604xn05/fulltext.pdf
Примечания : 28.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Fluorine-containing quinazolines annulated at the sides [a] and [c] were synthesized by the reaction of 2- and 4-hydrazino-substituted quinazolines with aldehydes and subsequent oxidative cyclization. Annulation at the side [b] was performed by alkylation of 2-alkylthio-4(3H)-quinazolinones with bromoethanol and ipso-substitution of the alkylthio group
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2009, 58 (6), 1303-1308.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 54/L 79
Автор(ы) : Men'shikov S. Y., Vurasko A. V., Petrov L. A., Molochnikov L. S., Novoselova A. A., Skryabina Z. E., Saloutin V. I.
Заглавие : Liquid-phase oxidation of anthracene by hydrogen-peroxide in the presence of heterogenized vanadyl acetylacetonate [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1992. - Vol. 41, N 4. - С. 619-622
Систем. требования: http://www.springerlink.com/content/pv62u7305k8076n4/fulltext.pdf
Примечания : 21.10.2011
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The synthesis of hetrogenized vanadyl acetylacetoonate was accomplished by alkylation of a chloromethylated styrene-divinylbenzene copolymer via activation by Co (II) complexes. The effect of heterogenization of the structure of the complexes and their catelytic properties in the peroxide oxidation of anthracene was investigated by kinetic studies and ERP spectroscopy
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1992, 41 (4), 619.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 54/M 78
Автор(ы) : Shchegol'kov E. V., Ivanova A. E., Burgart Ya. V., Saloutin V. I., Chupakhin O. N.
Заглавие : Modification of 2-trifluoromethyl-1H-benzimidazole with hydroxyalkyl substituents
Место публикации : Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2013. - Vol.49, №3. - С. 417-420
Примечания : Библиогр.: с. 420 (7 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 1h-benzimidazole --4-bromobutyl acetate--hydrogen chloride
Аннотация: Alkylation of 2-(trifluoromethyl)-1H-benzimidazole with 4-bromobutyl acetate gave 4-[2-(trifluoromethyl)-1H-benzimidazol-1-yl]butyl acetate which was deacylated by the action of hydrogen chloride in anhydrous ethanol. 4-[2-(Trifluoromethyl)-1H-benzimidazol-1-yl]butan-1-ol thus formed showed a moderate tuberculostatic activity. Alkylation of the title compound with chloromethyloxirane afforded a mixture of 1-chloro-3-[2-(trifluoromethyl)-1H-benzimidazol-1-yl]-propan-2-ol and 1-(oxiran-2-ylmethyl)-2-trifluoromethyl-1H-benzimidazole. A new procedure was proposed for the synthesis of 2-[(2-trifluoromethyl-1Hbenzimidazol-1-yl)methoxy]ethyl acetate
\\\\expert2\\NBO\\Russian Journal of Organic Chemistry\\2013, 49, (3), 417-420.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 54/N 10
Автор(ы) : Skorik Yu.A., Gomes C. A. R. , Vasconcelos M.T.S.D., Yatluk Yu. G.
Заглавие : N-(2-Carboxyethyl)chitosans: Regioselective synthesis, characterisation and protolytic equilibria
Место публикации : Carbohydrate Research. - 2003. - Vol. 338, № 3. - С. 271-276
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: N-(2-Carboxyethyl)chitosans were obtained by reaction of low molecular weight chitosan with a low degree of acetylation and 3-halopropionic acids under mild alkaline media (pH 8-9, NaHCO3) at 60°C. The chemical structure of the derivatives obtained was determined by 1H and 13C NMR spectroscopies. It was found that alkylation of chitosan by 3-halopropionic acids proceeds exclusively at the amino groups. The products obtained are described in terms of their degrees of carboxyethylation and ratio of mono-, di-substitution and free amine content. The protonation constants of amino and carboxylate groups of a series of N-(2-carboxyethyl)chitosans were determined by pH-titration at ionic strength 0.1 M KNO3 and 25°C. © 2002 Elsevier Science Ltd. All rights reserved.
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9.

Вид документа : Статья из журнала
Шифр издания : 54/N 10
Автор(ы) : Pestov A. V., Skorik Yu.A., Kogan G., Yatluk Yu. G.
Заглавие : N-alkylation of chitosan by beta-halopropionic acids in the presence of various acceptors
Место публикации : Journal of Applied Polymer Science . - 2008. - Vol. 108, № 1. - С. 119-127
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: N-carboxyethylation of chitosan by -halopropionic acids in the presence of various proton and halogen ion acceptors was investigated. It has been observed that carboxyethylation of chitosan in aqueous medium is accompanied by the by-processes of hydrolysis and dehydrohalogenation of the -halopropionic acids yielding -hydroxypropionic acid, bis(2-carbox-yethyl) ether, and acrylic acid. Degree of carboxyethyl substitution (DS) of chitosan and the relative rates of the by-processes varied significantly depending on the conditions used and nature of the proton or halogen ion acceptor. At carboxyethylation of chitosan with the alkaline -bromopropionates, the DS increased in the order Cs+ Rb- K+ sim; Na+ Li-.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moseev T. D., Nikiforov E. A., Varaksin M. V., Starnovskaya E. S., Savchuk M. I., Nikonov I. L., Kopchuk D. S., Zyryanov G. V., Chupakhin O. N., Charushin V. N.
Заглавие : Novel pentafluorophenyl- and alkoxyphenyl-appended 2,2'-bipyridine push-pull fluorophores: a convenient synthesis and photophysical studies
Место публикации : Synthesis. - 2021. - Vol. 53, № 19. - С. 3597-3607
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 2,2′-bipyridines--1,2,4-triazines--polyfluoroarenes
Аннотация: A convenient method for the synthesis of new highly in non-polar solvents soluble photoactive pentafluorophenyl-substituted and extended alkoxyphenyl-substituted 2,2′-bipyridines is reported. The synthetic strategy for the preparation of such ligands involves a sequence of several structural transformations, such as O-alkylation, nucleophilic substitution of hydrogen (SN H) in 1,2,4-triazine precursors via the ‘addition–elimination’ scheme, and the subsequent conversion of the obtained 1,2,4-triazines into 2,2′-bipyridines by means of the aza-Diels–Alder reaction. The photophysical properties of the synthesized novel pentafluoroaryl-substituted 2,2′-bipyridines were comprehensively studied. The obtained photophysical data indicate the competitive advantages of the herein reported pentafluoroarylated push–pull fluorophores, bearing extended aliphatic moieties, over their analogues containing benzoxy or phenolic fragments in terms of improvement in quantum yield and well-pronounced positive solvatochromism confirmed by the mathematical analysis according to the Lippert–Mataga equation.
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