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Общее количество найденных документов : 17
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 1-10    11-17 
1.
Инвентарный номер: нет.
   
   L 79


   
    Liquid-phase oxidation of anthracene by hydrogen-peroxide in the presence of heterogenized vanadyl acetylacetonate [Electronic resource] / S. Y. Men'shikov, A. V. Vurasko, L. A. Petrov, L. S. Molochnikov, A. A. Novoselova, Z. E. Skryabina, V. I. Saloutin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1992. - Vol. 41, N 4. - P619-622
ББК 54
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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2.
Инвентарный номер: нет.
   
   A 10


   
    A new approach to fluorinated 4(1H)-quinazolinones [Electronic resource] / A. A. Layeva, E. V. Nosova, G. N. Lipunova, T. V. Trashakhova, V. N. Charushin // Journal of Fluorine Chemistry. - 2007. - Vol. 128, № 7. - P748-754
ББК 54
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.
Инвентарный номер: нет.
   
   N 10


   
    N-(2-Carboxyethyl)chitosans: Regioselective synthesis, characterisation and protolytic equilibria [Text] / Yu. A. Skorik, C. A. R. Gomes, M. T.S.D. Vasconcelos, Yu. G. Yatluk // Carbohydrate Research. - 2003. - Vol. 338, № 3. - P271-276
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CARBOXYETHYLATION POLYSACCHARIDES -- N-(2-CARBOXYETHYL)CHITOSAN -- POLYAMPHOLYTE
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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4.
Инвентарный номер: нет.
   


   
    2,3-Dichloro-1-alkylpyrazinium tetrafluoroborates: the synthesis and reactions with nucleophiles [Electronic resource] / G. L. Rusinov, P. A. Slepukhin, V. N. Charushin, O. N. Chupakhin // Mendeleev Communications. - 2001. - Vol. 11, № 2. - P78-80
ББК 54
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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5.
Инвентарный номер: нет.
   
   N 10


   
    N-alkylation of chitosan by beta-halopropionic acids in the presence of various acceptors [Text] / A. V. Pestov, Yu. A. Skorik, G. Kogan, Yu. G. Yatluk // Journal of Applied Polymer Science . - 2008. - Vol. 108, № 1. - P119-127
ББК 54
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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6.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis of polyfluorinated ethers [Electronic resource] / D. N. Bazhin, T. I. Gorbunova, A. Ya. Zapevalov, V. I. Saloutin // Russian Journal of Applied Chemistry. - 2005. - Vol. 78, № 10. - P1646-1650. - Bibliogr. : p. 1650 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ETHERS -- POLYFLUORINATED ETHERS -- ALKYLATION -- TELOMERIC ALCOHOLS -- ALKYL HALIDES -- ALKYL TOSYLATES
Аннотация: Procedures for preparing polyfluorinated ethers H(CF2CF 2)nCH2OR by alkylation of the corresponding telomeric alcohols H(CF2CF2)nCH2OH (n = 1-3) with alkyl halides and alkyl tosylates were examined.

\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2005, v. 78, N. 10, p.1646.pdf
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7.
Инвентарный номер: нет.
   
   A 10


   
    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 [Text] / N. P. Belskaia, T. G. Deryabina, A. V. Koksharov, M. I. Kodess, A. T. Lebedev, V. A. Bakulev // Tetrahedron Letters. - 2007. - Vol. 48, № 52. - P9128-9131
ББК 54
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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8.
Инвентарный номер: нет.
   
   N 91


   
    Nucleophilic substitution of hydrogen in the reaction of 1,2,4-triazin-4-oxides with cyanamide [Electronic resource] / V. N. Kozhevnikov, A. M. Prokhorov, D. N. Kozhevnikov, V. L. Rusinov, O. N. Chupakhin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2000. - Vol. 49, № 6. - P1122-1124
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: It was shown that cyanamide can successfully be used in reactions of nucleophilic substitution of hydrogen with 1,2,4-triazin-4-oxides in the presence of a base to give 5-cyanoimino-1,2,4-triazines. It was found by13C NMR spectroscopy that these compounds and their alkylation products at the cyclic nitrogen atom exist in the form of 5-cyanoimino-2,5-dihydro-1,2,4-triazines

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2000, 49 (6), 1122.pdf
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9.
Инвентарный номер: нет.
   
   F 70


   
    Fluorine-containing quinazolines annulated at the pyrimidine ring [Electronic resource] / E. V. Nosova, A. A. Laeva, T. V. Trashakhova, G. N. Lipunova, P. A. Slepukhin, V. N. Charushin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2009. - Vol. 58, № 6. - P1303-1308
ББК 54
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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10.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis, characterization and some properties of N-(2-carboxyethyl)chitosan [Text] / Yu. A. Skorik, C. A. R. Gomes, M. T.S.D. Vasconcelos, Yu. G. Yatluk // Advances in Chitin Science : Proceedings of the 5th Asia Pacific Chitin and Chitosan Symposium & Exhibition, Bangkok, Thailand, March 13-15, 2002. - Bangkoki, 2002. - Vol. 5. - P344+348 : il. - Bibliogr. : p. 348 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CHITOSAN -- CARBOXYETHYL -- ALKYLATION -- POLYAMPHOLYTE -- POTENTIOMETRIC TITRATION -- PROTONATION CONSTANTS

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