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Общее количество найденных документов : 19
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 1-10    11-19 
1.
Инвентарный номер: нет.
   
   M 61


   
    Metal and boron derivatives of fluorinated cyclic 1,3-dicarbonyl compounds [Text] / D. V. Sevenard, O. G. Khomutov, N. S. Boltacheva, V. I. Filyakova, V. Vogel, V. Ya. Sosnovskikh, V. O. Iaroshenko, G. -V. Roeschenthaler // Zeitschrift fur Naturforschung - Section B. Journal of Chemical Science. - 2009. - Vol. 64, № 5. - P541-550
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Starting from the corresponding cyclic 1,3-diketones or other precursors (cyclic ketones as well as lactones), several new salts and chelate complexes of fluorinated 1,3-dicarbonyls were obtained. Their preparative significance was demonstrated by straightforward syntheses of fluorinated pyrazoles, benzimidazoles and 1,7-ketoesters. The structure of a boron chelate of 2-(trifluoroacetyl)- cyclohexanone was investigated by X-ray diffraction

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2.
Инвентарный номер: нет.
   
   F 26


   
    Fast Enol-enol Tautomerism of Fluorinated 1,3-Dicarbonyl and 1,3.5-Tricarbonyl Compounds Reinvestigated [Text] : доклад, тезисы доклада / D. V. Sevenard, G. -V. Roeschenthaler, I. I. Bilkis, M. I. Kodess, D. L. Chizhov, K. I. Pashkevich, D. V. Sevenard // 18th ISFC international Symposium on Fluorine Chemistry. Bremen, 30th Jul.-4 Aug. 2006 г. : Final Program. Abstracts. - Bremen, 2006. - P180
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ENOL-ENOL -- TAUTOMERISM -- TRICARBONY

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3.
Инвентарный номер: нет.
   
   C 73


   
    Condensation of 2-polyfluoroacycloalkanones with aldehydes and dimethylformamide-dimethylacetal [Text] / D. V. Sevenard, O. G. Khomutov, M. I. Kodess, K. I. Pashkevich, I. Loop, E. Lork, G. -V. Roeschenthaler // Australian Journal of Chemistry. - 2001. - Vol. 54, № 3. - P157-163
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Polyfluorinated 1,3-diketones containing carbocycles react with aldehydes under Lewis-acid catalysis and also with dimethylformamide-dimetylacetal without catalysis, yielding exclusively (E)-configured condensation products involving the methylene group of the carbocycle. Novel trifluoromethylated chromenes are prepared from 2-trifluoroacetylcycloalkanones and salicylaldehyde. The structures of two new compounds, 2-(E)-benzylidene-6-trifluoroacetylcyclohexanone and 4-trifluoroacetyl-2,3-dihydro-1H-xantene, are confirmed by X-ray structure analysis.

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4.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis of 1,1,1,7,7,7-hexafluoroheptane-2,4,6-trione, the simplest fluorinated 1,3,5-triketone [Text] / D. V. Sevenard, O. Kazakova, D. L. Chizhov, G. -V. Roeschenthaler // Journal of Fluorine Chemistry. - 2006. - Vol. 127, № 7. - P983-986
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A simple, convenient and effective method to synthesize 1,1,1,7,7,7-hexafluoroheptane-2,4,6-trione, the simplest fluorinated 1,3,5-triketone, on a preparative scale was developed. The title compound was obtained by a Claisen-type double condensation of acetone with trifluoroacetic acid ethyl ester and isolated as a solid monohydrate from the reaction mixture. Subsequent dehydration proceeds smoothly to produce the desired compound as an individual substance. Its peculiar tautomeric (keto–enol, ring–chain) features in various solvents are discussed

\\\\Expert2\\nbo\\Journal of Fluorine Chemistry\\2006, v.127, p.983.pdf
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5.
Инвентарный номер: нет.
   
   H 19


   
    Halogenation of Fluorinated 1,3-Dicarbonyl and 1,3,5-Tricarbonyl Compounds [Text] : доклад, тезисы доклада / D. V. Sevenard [и др.] // 18th ISFC international Symposium on Fluorine Chemistry. Bremen, 30th Jul.-4 Aug. 2006 г. : Final Program. Abstracts. - Bremen, 2006. - P271
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
HALOGEN -- HALOGENATION AGENTS

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6.
Инвентарный номер: нет.
   
   R 18


    Ralph-Matthias Schoth
    Fluorinated 1,3-diketones, 2-trifluoroacetyl phenols and their derivatives: versatile reactants in phosphorus chemistry [Text] / Ralph-Matthias Schoth , D. V. Sevenard, K. I. Pashkevich // Coordination Chemistry Reviews . - 2000. - Vol. 210, № 1. - P101-134
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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7.
Инвентарный номер: нет.
   
   R 30


   
    Reactions of fluoroalkyl-containing lithium 1,3-diketonates with diaminoarenes and 2-aminobenzenethiol [Electronic resource] / V. I. Filyakova, N. S. Boltacheva, D. V. Sevenard, V. N. Charushin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2010. - Vol. 59, № 9. - P1791-1796. - Bibliogr. : p. 1796 (25 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
FLUOROALKYL -- CONTAINING LITHIUM 1,3-DIKETONATES -- 1,2-DIAMINOBENZENE -- 2,3-DIAMINONAPHTHALENE -- 1,2-DIAMINO-4,5-DIFLUOROBENZENE -- 2-AMINOBENZENETHIOL
Аннотация: 1,5-Benzo[b]- and 1,5-naphtho[2,3-b]diazepines were synthesized by the reaction of lithium 1,3-diketonates with 1,2-diaminobenzene and 2,3-diaminonaphthalene in an MeOH-AcOH-HCl mixture at 0 °C. The reactions of fluoroalkyl-containing lithium 1,3-diketonates with 1,2-diaminobenzene and 1,2-diamino-4,5-difluorobenzene under reflux in acetic acid afford 2-fluoroalkyl-containing benzimidazoles as the major products, whereas the reaction with 2-aminothiophenol gives 2-phenylbenzothiazole. The reactions of lithium diketonate containing the cyclohexane and cyclopentane moieties with 1,2-diaminoarenes and 2-aminobenzenethiol are accompanied by the opening of the carbocycle to form 2-(6-oxo-7,7,7-trifluoroheptyl)benzimidazole and 2-(5-oxo-6,6,6-trifluorohexyl)benzothiazole hydrates, respectively.

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2010, 59 (9), 1791-1796.pdf
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8.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis and tautomeric equilibrium of 2,6-bis(trifluoroacetyl)cyclohexanone [Electronic resource] / D. V. Sevenard, O. G. Khomutov, M. I. Kodess, K. I. Pashkevich // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1999. - Vol. 48, № 2. - P400-401
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1999, 48 (2), 400.pdf
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9.
Инвентарный номер: нет.
   
   R 30


   
    Reaction of 2-(polyfluoroacyl)cycloalkanones with hydroxylamine [Text] / D. V. Sevenard, O. G. Khomutov, K. I. Pashkevich, E. Lork, G. -V. Roeschenthaler // Helvetica Chimica Acta. - 2002. - Т. 85, № 7. - P1960-1972. - Библиогр.: с.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The 2-acylcycloalkanones 1a-g and 3a-c, possessing a polyfluoroalkyl group, react with hydroxylamine regio- and stereoselectively to yield 4,5-dihydroisoxazol-5-ols 2a-g and 4a-c, respectively, i.e., products of N-addition to the oxo group at the cycloalkane ring (Schemes 1 and 2). The products 2 and 4 can be dehydrated under drastic conditions only (Schemes 3 and 4). The structure of one of the 4,5-dihydroisoxazol-5-ols was confirmed by X-ray crystal-structure analysis

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10.
Инвентарный номер: нет.
   
   N 89


   
    Novel polyfluoroalkylated pyrazoles from 2-polyfluoroacylcycloalkanones and hydrazines: Syntheses and unequivocal molecular structure assignment [Text] / D. V. Sevenard, O. G. Khomutov, M. I. Kodess, K. I. Pashkevich, I. Loop, E. Lork, G. -V. Roeschenthaler // Canadian Journal of Chemistry. - 2001. - Vol. 79, № 2. - P183-194
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
HYDRAZINES -- MOLECULAR STRUCTURE -- ISOMERIC PYRAZOLES;
Аннотация: The reaction between 2-trifluoroacetylcycloalkanones and methylhydrazine or phenylhydrazine exclusively yields 3-CF3-pyrazoles. When the chain length of the polyfluorinated substituent in RFC(O) group increases, 5-RF-pyrazoles are isolated. The reaction of 2-trifluoroacetylcyclohexanone with 2-hydrazinopyradine gives 5-hydroxypyrazoline, an intermediate in the formation of 5-CF3-pyrazoles. The regiochemistry of the condensation is probably controlled by the nucleophilicity of the terminal nitrogen in the mono substituted hydrazines and by the steric requirements of the RF group in the 1,3-diketones. Polymethylene chain containing pyrazoles obtained from the 1,3-diketones in question and hydrazine prefer the 3-RF tautomeric form, irrespective of carbocyclic ring size and polyfluoroalkyl group chain length.

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