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Вид документа :
Шифр издания : 54
Автор(ы) : Verbitskiy E. V., Slepukhin P. A., Ezhikova M. A., Kodess M. I., Shvachko Yu.N., Starichenko D.V., Rusinov G. L., Charushin V. N.
Заглавие : σH-Adducts of 1-alkyl-1,4-diazinium salts as the sources of biradicals in the synthesis of tetraazaphenanthrenes
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2011. - Vol.60, №5. - С. 975-980
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): ph-adducts--biradicals--tetraazaphenanthrenes
Аннотация: O- and C-Adducts of 5-(het)aryl-2,3-dicyano-1-ethylpyrazinium salts are latent sources of biradicals capable of forming tetraazaphenanthrene derivatives via dimerization. The mechanisms of the reactions were examined using ESR spectroscopy. The stereochemistry of the resulting heterocyclic systems was studied by NMR spectroscopy. The crystallographic data on their three-dimensional structures were obtained
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2011, 60 (5), 975-980.pdf
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Вид документа : Статья из сборника (однотомник)
Шифр издания : 54/U 88
Автор(ы) : Kodess M. I., Ezhikova M. A., Levit G. L., Krasnov V. P., Charushin V. N.
Заглавие : Use of chiral lanthanide shift reagent in the eluidation of NMR signals from enantiomeric mixtures of 1-substituted 3-amino-1,2-dicarba-closo-dodecarboranes : доклад, тезисы доклада
Место публикации : Euroboron 3, The 3rd European Meeting on Boron Chemistry, Pruhonice-by-Prague, Czech Republic, 12-16 Sept. 2004 : abstr. . - Pruhonice-by-Prague, Czech Republic, 2004. - С. P33
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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Вид документа :
Шифр издания : 54/U 62
Автор(ы) : Ovchinnikova I. G., Valova M. S., Matochkina E. G., Kodess M. I., Tumashov A. A., Slepukhin P. A., Fedorova O. V., Rusinov G. L., Charushin V. N.
Заглавие : Unusual heterocyclization of chalcone podands with 3-amino-1,2,4-triazole
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2011. - Vol.60, №5. - С. 965-974
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): template synthesis--chalcone podand--crown ethers
Аннотация: A new type of intramolecular cyclization of 1,5-bis[2-(E-3-oxo-3-phenylprop-1-enyl)-phenoxy]-3-oxapentane with 3-aminotriazole promoted by potassium ions was discovered. A cascade mechanism for the formation of crownophane with 4,7-dihydro[1,2,4]triazolo[1,5-a]-pyrimidine fragment was suggested. Effects of oligooxyethylene fragment of the chalcone podand and acid-base catalysis on the selectivity of the cyclocondensation processes and degree of oxidation of triazolopyrimidine fragments were studied. The product structures were confirmed by IR, 1H and 13C NMR spectroscopy and X-ray diffraction study
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2011, 60 (5), 965-974.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Nosova E. V., Moshkina T. N., Lipunova G. N., Baklanova I. V., Slepukhin P. A., Charushin V. N.
Заглавие : Synthesis, structure and photoluminescent properties of BF2 and BPh2 complexes with N,O-benzazine ligands [Электронный ресурс]
Место публикации : Journal of Fluorine Chemistry. - 2015. - Vol. 175. - С. 145-151
Систем. требования: http://apps.webofknowledge.com/
Примечания : Bibliogr. : p. 150-151 (29 ref.). - 18.01.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): n,o-bidentate ligands--bph2 complexes--bf2 complexes
Аннотация: Novel N,O-bidentate BF2 and BPh2 complexes have been prepared in good to excellent yields through coordination of 8-hydroxy-2-methylquinolines and 2-(2-hydroxyphenyl)-3H-quinazolin-4-ones with boron trifluoride etherate or triphenylborane under mild conditions. All complexes have been characterized by H-1, B-11 and F-19 NMR, mass-spectrometry and X-ray crystallography data. Some complexes have been found to exhibit a significant fluore.scence in acetonitrile solutions. Electronic and site effects of substituents in both heterocyclic and phenol fragments proved to have a profound impact on quantum yields.
\\\\expert2\\nbo\\Journal of Fluorine Chemistry\\2015,V.175, p.145-151.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Ovchinnikova I. G., Kim G. A., Matochkina E. G., Kodess M. I., Barykin N. V., Eltsov O. S., Nosova E. V., Rusinov G. L., Charushin V. N.
Заглавие : Synthesis, photochemical and luminescent properties of (E)-2-(2-hydroxyarylethylene)-3-phenylquinazolin-4(3H)-ones [Электронный ресурс]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2015. - Vol. 63, № 11. - С. 2467-2477
Систем. требования: http://apps.webofknowledge.com/
Примечания : Bibliogr. : p. 2477 (22 ref.). - 18.01.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): (e)-2-styrylquinazolin-4(3h)-ones --luminescence--ortho-hydroxystyrylquinazolinones
Аннотация: Photoinduced transformations of 2-styrylquinazolinones in solutions were studied using absorption and NMR spectroscopy methods. A possibility of control of the photochemical isomerization rate of quinazolinone 2-(hydroxyaryl)ethenyl derivatives by changing the pH of the medium was demonstrated. The bases and the solvent nature also affect the luminescence intensity of solutions of these compounds in the wavelength range of 550-650 nm. The differences in the steric organization of the ortho-hydroxystyryldiazinone system in crystals and in solutions related to the turn of the aryl group were found. Their influence on the competing processes of luminescence and photochemical transformation of the ethylene fragment were shown. The fact of reversible photo/thermal E-Z-isomerization was established for (E)-2-(2-hydroxystyryl)-3-phenylquinazolin-4(3H)-one.
\\\\expert2\\nbo\\Russian Chemical Bulletin\\2015, 63 (11), 2467-2477.pdf
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krasnov V. P., Musiyak V. V. , Levit G. L., Gruzdev D.A., Charushin V. N., Andronova V. L., Galegov G. A., Orshanskaya I. R., Sinegubova E. O., Zarubaev V. V.
Заглавие : Synthesis of pyrimidine conjugates with 4-(6-amino-hexanoyl)-7,8-difluoro-3,4-dihydro-3-methyl-2h-[1,4] benzoxazine and evaluation of their antiviral activity
Место публикации : Molecules. - 2022. - Vol. 27, № 13. - Ст.4236
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): pyrimidine
Аннотация: A series of pyrimidine conjugates containing a fragment of racemic 7,8-difluoro-3,4-dihydro-3-methyl-2H-[1,4]benzoxazine and its (S)-enantiomer attached via a 6-aminohexanoyl fragment were synthesized by the reaction of nucleophilic substitution of chlorine in various chloropyrimidines. The structures of the synthesized compounds were confirmed by 1H, 19F, and 13C NMR spectral data. Enantiomeric purity of optically active derivatives was confirmed by chiral HPLC. Antiviral evaluation of the synthesized compounds has shown that the replacement of purine with a pyrimidine fragment leads to a decrease in the anti-herpesvirus activity compared to the lead compound, purine conjugate. The studied compounds did not exhibit significant activity against influenza A (H1N1) virus.
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Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Levit G. L., Krasnov V. P., Gruzdev D.A., Demin A. M., Bazhov I. V., Chupakhin O. N., Charushin V. N.
Заглавие : Synthesis of N-[(3-Amino-1,2-dicarba-closo-dodecaboran-1-yl)acetyl] Derivatives of alfa-Amino Acids
Место публикации : Collection of Czechoslovak Chemical Communications. - 2007. - Vol. 72, № 12. - С. 1697-1706
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The N-[(3-amino-1,2-dicarba-closo-dodecaboran-1-yl)acetyl] derivatives of amino acids were prepared starting from N-protected (Ac, Form, Bz, and Boc) 3-amino-1-(carboxymethyl)-o-carboranes and alkyl esters of natural amino acids using the carbodiimide method of coupling and removing the ester groups. All the amides obtained were diastereoisomeric mixtures. Some diastereoisomers were separated and the assignment of the absolute configuration of aminocarborane fragments was performed by X-ray crystallography
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Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Kotovskaya S. K., Zhumabaeva G. A., Charushin V. N., Chupakhin O. N.
Заглавие : Synthesis of fluorine-containing quinoline-2,3-dicarboxylates from products of vicarious nucleophilic substitution of hydrogen in 3-fluoronitroarenes [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2009. - Vol. 58, № 1. - С. 170-175
Систем. требования: http://www.springerlink.com/content/t7412585856105xk/fulltext.pdf
Примечания : 28.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The reactions of 3-fluoro-4-R-6-phenylsulfonylmethylnitrobenzenes with dimethyl fumarate or diethyl maleate in acetonitrile in the presence of an excess of K2CO3 and a catalytic amount of 18-crown-6 afforded mixtures of dialkyl 6-R-7-fluoro- and dialkyl 6-R-7-phenylsulfonylquinoline-2,3-carboxylate N-oxides, as well as dialkyl 6-R-7-fiuoro- quinoline-2,3-carboxylates (alkyl is methyl or ethyl), which were resolved by column chromatography and identified by 1H NMR spectroscopy and X-ray diffraction
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2009, 58 (1), 170-175.pdf
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Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Boltacheva N. S., Filyakova V. I., Khmara E. F., Koryakova O. V., Charushin V. N.
Заглавие : Synthesis and structure of fluoroalkyl containing lithium 1,3-diketonates [Electronic resource]
Место публикации : Russian Journal of General Chemistry. - 2010. - Vol. 80, № 1. - С. 179-189
Систем. требования: http://www.springerlink.com/content/54q455g442087558/fulltext.pdf
Примечания : 17.10.2011
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Methods of synthesis and IR, mass, NMR 1H, 19F, 13C spectra as well as X-ray analysis of fluoroalkyl containing lithium 1,3-diketonates are reviewed ??
\\\\Expert2\\nbo\\Russian Journal of General Chemistry\\2010, V. 80, N 1, p.179.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 54/S 59
Автор(ы) : Verbitskiy E. V., Berezin M. V., Slepukhin P. A., Rusinov G. L., Charushin V. N.
Заглавие : Sigma(H)-Adducts of N-alkylpyrazinium and quinoxalinium salts with nucleophiles. The 1H and 13C NMR spectra and the crystal structures of P-adducts [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2009. - Vol. 58, № 1. - С. 176-181
Систем. требования: http://www.springerlink.com/content/r50uh32j74487057/fulltext.pdf
Примечания : 28.10.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The previously unknown addition products of P-nucleophiles to 5-aryl- and 5-hetaryl- 2,3-dicyano-1-ethylpyrazinium salts and to 5-aryl- and 5-hetaryl-14nethylquinoxalinium salts were synthesized. The three-dimensional structures of the P- sigma(H)-adducts of the 1,4-diazine series were established by X-ray diffraction
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2009, 58 (1), 176-181.pdf
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11.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Charushin V. N., Beb Van Veldhuizen, Henk C. van der Plas, Casper H. Stam
Заглавие : Reactivity of 3-alkynylthio-1-ethyl-1,2-4-triazinium salts in intramolecular Diels-Alder reactions [Электронный ресурс]
Место публикации : Tetrahedron. - 1989. - Vol. 45. - С. 6499-6510
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0040402001895260
Примечания : Bibliogr. : p. 6510 (20 ref.). - 21.01.2016
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 1,2,4-triazines--triethyloxonium tetrafluoroborate --diels-alder reactions
Аннотация: Quaternization of 3-(3-butynylthio) and 3-(4-pentynyltio) substituted 1,2,4-triazines with triethyloxonium tetrafluoroborate in CH2Cl2 at room temperature occurs exclusively at N-1 yielding 3-alkynylthio-1-ethyl-1,2,4-triazinium salts, as unequivocally shown by the 13C NMR and X-ray crystallographic data. 3-Alkynylthio-1-ethyl-5-phenyl-1,2,4-triazinium salts undergo the intramolecular Diels-Alder reaction into the corresponding thieno [2,3-b]- and thiopyrano [2,3-b]pyridines under considerably milder conditions than the corresponding neutral 1,2,4-triazines.
\\\\expert2\\nbo\\Tetrahedron\\1989, v. 45, p. 6499.pdf
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12.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Rusinov G. L., Verbitskiy E. V., Slepukhin P. A., Zabelina O. N., Kodess M. I., Ezhikova M. A., Charushin V. N., Chupakhin O. N.
Заглавие : Reactions of radicals generated from 1-ethyl-1,4-diazinium salts: Addition to the C-C triple bond versus dimerization
Место публикации : Heterocycles. - 2009. - Vol. 78, № 9. - С. 2315-2324
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Radical species generated from 5-aryl-substituted 1-ethyl-2,3-dicyano-1,4-diazinium salts by action of sodium iodide undergo dimerization into [2,2?]bipyrazinyl derivatives, as evidenced by NMR and X-ray crystallography data. The pyrazinyl radicals can also be involved into the addition reaction on the C-C triple bond, thus demonstrating a new synthetic route to modify the structure of pyrazines. The structures of E- and Z-isomers of 1-(1?,2?-dihydropyrazinyl-2?)-2-iodoethenes have been proved by 1H and 13C NMR spectroscopy and X-ray analysis
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13.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Rusinov G. L., Verbitskiy E. V., Slepukhin P. A., Zabelina O. N., Kodess M. I., Ezhikova M. A., Charushin V. N., Chupakhin O. N.
Заглавие : Reactions of radicals generated from 1-ethyl-1,4-diazinium salts: addition to the C-C triple bond dimerization
Место публикации : Heterocycles : an International Journal for Reviews and communications in Heterocyclic Chemistry. - 2011. - V. 78, № 9. - С. 2315-2324: граф., табл.
Примечания : Библиогр.: с. 2323-2324 (32 назв.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Radical species generated from 5-aryl-substituted 1-ethyl-2,3-dicyano-1,4-diazinium salts by action of sodium iodide undergo dimerization into [2,2']bipyrazinyl derivatives, as evidenced by NMR and X-ray crystallography data. The pyraziny! radicals can also be involved into the addition reaction on the C-C tziple bond, thus demonstrating a new synthetic route to modify the structure of pyrazines. The structures of E- and Z-isomers of 1-(1',2'-dihydropyrazinyl-2')-2-iodoethenes have been proved by 1H and 13C NMR spectroscopy and X-ray analysis.
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14.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Kazantseva I. V., Charushin V. N., Chupakhin O. N., Chernyshev A. I., Esipov S. E.
Заглавие : Reactions of N-alkylazinium cations. 3. Quaternary pteridinium salts. Synthesis, structure, and reactions with simple nucleophiles [Электронный ресурс]
Место публикации : Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 9. - С. 1048-1055
Систем. требования: http://link.springer.com/article/10.1007/BF00515033
Примечания : Bibliogr. : p. 1054-1055 (14 ref.). - 12.10.15
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 4-morpholinopteridine--triethyloxonium tetra-fluoroborate --nucleosides
Аннотация: 4-Morpholinopteridine reacts with triethyloxonium tetra-fluoroborate to give two types of isomeric quaternary salts, viz., 1-ethyl- and 8-ethyl-4-morpholinopteridinium tetrafluoroborates. The structures of the pteridinium cations were proved by the 1H and 13C NMR spectra and also by chemical transformations in reactions with simple nucleophiles.
\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1985, v.21, N 9, p. 1048.pdf
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15.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Alekseev S. G., Torgashev P. A., Fedotov M. A., Rezvukhin A. I., Shorshnev S. V., Belik A. V., Charushin V. N., Chupakhin O. N.
Заглавие : Reactions of azinium cations. 8. Electron structures of 3-substituted 1,2,4-triazines and protonation, quaternization, and reactions with nucleophiles [Электронный ресурс]
Место публикации : Chemistry of Heterocyclic Compounds. - 1988. - Vol. 24, № 4. - С. 434-441
Систем. требования: http://link.springer.com/article/10.1007/BF00478865
Примечания : Bibliogr. : p. 440-441 (34 ref.). - 24.10.15
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 1,2,4-triazines--nucleophiles
Аннотация: The electron structures of 3-substituted 1,2,4-triazines and isomeric N-methyltriazinium salts were calculated by the CNDO/2 method. The results of the calculations were compared with the parameters of the 13C, 15N, and 14N NMR spectra, as well as with experimental data on the protonation, N-alkylation, and reactions of 1,2,4-triazines with simple nucleophiles. The protonation centers of 1,2,4-triazines were determined by means of 1H, 13C, and 14N NMR spectroscopy. The covalent adducts formed by the proton salts of 3-methoxy-, 3-methylthio-, 3-morpholino-, and 3-pyrrolidino-1,2,4-triazine with water and methanol were recorded by 1H NMR spectroscopy.
\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1988, v.24, N 4, p. 434.pdf
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16.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Chupakhin O. N., Charushin V. N., Kazantseva I. V., Ponizovskii M. G., Sidorov E. O., Torgashev P. A., Belik A. V.
Заглавие : Reactions of azinium cations. 7. 13C NMR spectra and electron structure of neutral σ-adducts of 1,4-diazinium cations and methylate anion [Электронный ресурс]
Место публикации : Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 10. - С. 1112-1117
Систем. требования: http://link.springer.com/article/10.1007/BF00476543
Примечания : Bibliogr. : p. 1116-1117 (23 ref.). - 22.10.15
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): nmr spectra--σ-adducts--pyrazinium
Аннотация: The 13C NMR spectra have been recorded of a number of σ-adducts formed by pyrazinium, quinoxalinium, and pteridinium cations with methylate anion. The experimental data were compared with CNDO/2 calculations of adduct electron structure.
\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 10, p. 1112.pdf
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17.

Вид документа : Статья из журнала
Шифр издания : 54/R 30
Автор(ы) : Alekseev S. G., Charushin V. N., Chupakhin O. N., Shorshnev S. V., Chernyshev A. I., Klyuev N. A.
Заглавие : Reactions of azinium cations. 6. N(1)-alkyl-1,2,4-triazinium salts. Reactions with indoles — The first case of the double addition of nucleophiles to a triazine ring [Электронный ресурс]
Место публикации : Chemistry of Heterocyclic Compounds. - 1986. - Vol. 22, № 11. - С. 1242-1249
Систем. требования: http://link.springer.com/article/10.1007/BF00471810
Примечания : Bibliogr. : p. 1249 (31 ref.). - 12.10.15
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 1,4-diazinium salts-- indoles--azinium cations
Аннотация: N(1)-Alkyl-3-morpholino-1,2,4-triazinium salts and N(1)-alkyl-3-pyrrolidino-1,2,4-triazinium salts were synthesized. The structures of these salts were established by 13C NMR spectroscopy. 1,2,4-Triazinium cations add indoles at C(5) and C(6) thereby displaying properties characteristic for 1,4-diazinium salts.
\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1986, v.22, N 11, p. 1242.pdf
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18.

Вид документа : Статья из журнала
Шифр издания : 54/Q 32
Автор(ы) : Chupakhin O. N., Charushin V. N., Chernyshev A. I., Esipov S. E.
Заглавие : Quaternization of pyrido[2,3-b]pyrazines: 1H and 13C NMR Study [Электронный ресурс]
Место публикации : Magnetic Resonance in Chemistry. - 1985. - Vol. 23, № 6. - С. 437-441
Систем. требования: http://onlinelibrary.wiley.com/doi/10.1002/mrc.1260230607
Примечания : Bibliogr. : p. 441 (20 ref.). - 26.10.15
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): n-methylpyrido[2,3-b]pyrazinium salts--pyrido[2,3-b]pyrazines
Аннотация: The structure of N-methylpyrido[2,3-b]pyrazinium salts has been examined by 1H and 13C NMR. 6-Dimethylamino- and 6-morpholino-pyrido[2,3-b]pyrazines were shown to undergo quaternization by methyl iodide at N-4 of the pyrazine ring, whereas the pyridine ring N-5 was the N-alkylation site in the reaction of unsubstituted pyrido[2,3-b]pyrazine with methyl iodide under the same conditions. The effects of quaternization on the 1H and 13C chemical shifts and the nJ(CH) values are discussed.
\\\\expert2\\nbo\\Magnetic Resonance in Chemistry\\1985, v.23, N 6, p.437.pdf
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Boltacheva N. S., Slepukhin P. A., Pervova M. G., Rudina A. Kh., Chemagina I. V., Taibinov N. P., Filyakova V. I., Loboiko B. G., Charushin V. N.
Заглавие : Oximes of fluoroalkyl-containing 1,3-diketones: specific features of synthesis, analysis, and thermal stability
Место публикации : Russian chemical bulletin. - 2022. - Vol. 71, № 7. - С. 1464-1473
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Nitrosation of lithium 1,3-diketonates bearing fluoroalkyl and aryl (or hetaryl) substituents in positions 1 and 3 results in 3-polyfluoroalkyl-1,2,3-propanetrione 2-oximes (from this point on, oximes). Under similar conditions, lithium (Z)-1,1,1-trifluoro-4-oxo-4-(thien-2-yl)-2-buten-2-olate forms a hydration product of the corresponding oxime. Nitrosation of fluoroalkyl-containing lithium 1,3-diketonates is accompanied by retro-decomposition of the initial lithium 1,3-diketonates and the target oximes (or their hydration products) followed by oxidation and hydrolysis of the reaction products. Under the GC-MS conditions, the oximes undergo partial thermal decomposition to 2-aryl(hetaryl)-2-oxoethanenitriles. An analysis of solutions of the oximes in DMSO-d6 by 1H and 19F NMR spectroscopies revealed isomerization and hydration of these compounds. The temperature ranges of stability of the oximes were determined by thermogravimetric analysis and differential thermal analysis. The molecular and crystal structures of 4,4-difluoro-1-(4-methoxyphenyl)-1,2,3-butanetrione 2-oxime and 4,4,4-trifluoro-1-(thien-2-yl)-1,2,3-butanetrione 2-oxime were determined by X-ray diffraction.
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20.

Вид документа :
Шифр издания :
Автор(ы) : Boltacheva N. S., Slepukhin P. A., Pervova M. G., Rudina A. Kh., Chemagina I. V., Taibinov N. P., Filyakova V. I., Loboiko B. G., Charushin V. N.
Заглавие : Oximes of fluoroalkyl-containing 1,3-diketones: specific features of synthesis, analysis, and thermal stability
Место публикации : Russian chemical bulletin. - 2022. - Vol. 71, № 4. - С. 1464-1473
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Nitrosation of lithium 1,3-diketonates bearing fluoroalkyl and aryl (or hetaryl) substituents in positions 1 and 3 results in 3-polyfluoroalkyl-1,2,3-propanetrione 2-oximes (from this point on, oximes). Under similar conditions, lithium (Z)-1,1,1-trifluoro-4-oxo-4-(thien-2-yl)-2-buten-2-olate forms a hydration product of the corresponding oxime. Nitrosation of fluoroalkyl-containing lithium 1,3-diketonates is accompanied by retro-decomposition of the initial lithium 1,3-diketonates and the target oximes (or their hydration products) followed by oxidation and hydrolysis of the reaction products. Under the GC-MS conditions, the oximes undergo partial thermal decomposition to 2-aryl(hetaryl)-2-oxoethanenitriles. An analysis of solutions of the oximes in DMSO-d6 by 1H and 19F NMR spectroscopies revealed isomerization and hydration of these compounds. The temperature ranges of stability of the oximes were determined by thermogravimetric analysis and differential thermal analysis. The molecular and crystal structures of 4,4-difluoro-1-(4-methoxyphenyl)-1,2,3-butanetrione 2-oxime and 4,4,4-trifluoro-1-(thien-2-yl)-1,2,3-butanetrione 2-oxime were determined by X-ray diffraction.
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