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Общее количество найденных документов : 76
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1.

Вид документа : Статья из журнала
Шифр издания : 54
Автор(ы) : Ratner V. G., Lork E., Pashkevich K. I., Roeschenthaler G.-V.
Заглавие : (E)-1,1,1-trifluoro-4-phenyl-but-2-ene-4-one and trimethyl phosphite
Место публикации : Journal of Fluorine Chemistry. - 2000. - Vol. 102, № 1-2. - С. 73-77
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The interaction of (E)-1,1,1-trifluoro-4-phenyl-but-2-ene-4-one (1) with trimethyl phosphite affords in a [4 + 1] cycloaddition the 1,2?5-oxaphospholene 2 as a sole product which upon hydrolysis is transformed into the fluoroalkyl containing ?-ketophosphonate 4. When the reaction is carried out in the presence of small mounts of water, in addition to 2 as a main product, the phosphoric acid ester 6 of the enolic dimer of ketone 1 is also formed. The molecular structure of compound 6 (monoclinic P 2(1)/c with a = 2088.60(2), b = 1403.1(3), c = 1613.8(1) pm, ? = 90, ? = 100.97(1), ? = 90°, Z = 8) was determined, indicating two independent molecules with (RR) and (SS) configuration and disordered CF3 groups.????
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2.

Вид документа : Статья из журнала
Шифр издания : 54
Автор(ы) : Lipunova G. N., Nosova E. V., Mochul`skaya N. N., Andreiko A. A., Chasovskikh O. M., Charushin V. N.
Заглавие : 1,2,4-Triazino[5,6,1-i,j]quinolines: a new type of tricyclic analogs of fluoroquinolones [Electronic resource]
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2002. - Vol. 51, № 4. - С. 663-667
Систем. требования: http://www.springerlink.com/content/kwep81pgqyj1mtc3/fulltext.pdf
Примечания : 24.10.2011
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The interaction of C-aryl-substituted amidrazones and S-methylisothiosemicarbazide with 3-ethoxy-2-polyfluorobenzoylacrylates results in corresponding N-(quinolin-1-yl)amidines that undergo conversion into derivatives of 1,2,4-triazino[5,6,1-i,j]quinoline by heating in acetic anhydride
\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2002, 51 (4), 663.pdf
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3.

Вид документа : Статья из журнала
Шифр издания : 54/A 10
Автор(ы) : Bazhin D. N., Kudyakova Yu.S., Roeschenthaler G.-V., Burgart Ya. V., Slepukhin P. A., Isenov M. L., Saloutin V. I., Charushin V. N.
Заглавие : A Convenient Approach to CF3-Containing N-Heterocycles Based on 2-Methoxy-2-methyl-5-(trifluoromethyl)furan-3(2H)-one [Электронный ресурс]
Место публикации : European Journal of Organic Chemistry. - 2015. - № 23. - С. 5236-5245
Систем. требования: http://apps.webofknowledge.com/
Примечания : Bibliogr. : p. 5245 (23 ref.). - 18.01.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): nitrogen heterocycles --fluorine--oxygen heterocycles
Аннотация: New synthetic routes to trifluoromethylated N-heterocycles based on condensations of 2-methoxy-2-methyl-5-(trifluoromethyl)furan-3(2H)-one with bifunctional N-nucleophiles are described. For the first time, trifluoromethyl-containing pyrazoles, pyrazolines and isoxazolines bearing hydrazone or oxime groups could be obtained by a one-pot strategy based on reactions of 5-(trifluoromethyl)furan-3(2H)-one with two equivalents of the corresponding hydrazines or hydroxylamine in the presence of an acid. The interaction of furan-3(2H)-one with ureas proceeded under mild conditions to furnish 1H-furo[2,3-d]imidazol-2(3H)-one derivatives in good yield. Further, a trifluoromethyl-containing quinoxaline derivative was obtained by condensation of furan-3(2H)-one with ortho-phenylenediamine.
\\\\expert2\\nbo\\European Journal of Organic Chemistry\\2015, №23. p.5236-5245.pdf
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4.

Вид документа : Статья из журнала
Шифр издания : 54/A 53
Автор(ы) : Khomutov O. G., Filyakova V. I., Kutchin A.V., Pashkevich K. I.
Заглавие : An efficient synthesis of alkylfluoroalkylketones
Место публикации : Journal of Fluorine Chemistry. - 1992. - Vol. 58, № 2-3. - С. 161
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Interaction of fluoroacyl chlorides with lithium tetraalkylaluminates II prepared by the hydroalumination of alkenes I results in fluorinated ketones III with yields of 65–70%.??RF = CF3, H(CF2)2, C4F9, C6F13 R1 = C3H7, C4H9, C6H13, C7H15??The reaction is simple and does not require an argon atmosphere, as is needed for most reactions of organoaluminum compounds????
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5.

Вид документа :
Шифр издания : 54/A 62
Автор(ы) : Gorbunova T. I., Zapevalov A. Ya., Bazhin D. N., Korshunov L. G., Gaviko V.S., Saloutin V. I.
Заглавие : Antifriction properties of new fluorine-containing derivatives of natural graphite
Место публикации : Russian Journal of Applied Chemistry. - 2012. - Vol.85, №1. - С. 102-107
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): antifriction properties --fluorine-containing derivatives--graphite
Аннотация: Interaction of natural graphite with potassium salts of perfl uoro(ω-chloroperfl uoro)carboxylic acids in the presence of potassium persulfate was studied. The derivatives obtained were used as independent lubricants for a chromium-containing-steel friction pair
\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2012, v. 85, N 1, p.102.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 54/A 62
Автор(ы) : Kogan G., Skorik Yu.A., Zitnanova I., Krizkova L., Durackova Z., Gomes C. A. R., Yatluk Yu. G., Krajcovic J.
Заглавие : Antioxidant and antimutagenic activity of N-(2-carboxyethyl)chitosan
Место публикации : Toxicology and Applied Pharmacology . - 2004. - Vol. 201, № 3. - С. 303-310: ил.
Примечания : Библиогр.: с. 309-310 (49 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The antioxidant and antimutagenic activities of the novel carboxyethyl derivatives of chitosan with three different degrees of substitution have been assayed in vitro in the unicellular flagellate Euglena gracilis subjected to the action of genotoxic agents acridine orange and ofloxacin. It has been demonstrated that chitosan derivatives exhibit concentration-dependent protective antigenotoxic activity against both mutagens. It is suggested that different mechanisms may be involved in its protective action—antioxidant activity in case of ofloxacin-induced DNA damage, as well as possible interaction with the cell membrane that prevents acridine orange from reaching the genetic compartments and subsequent damaging DNA through intercalative binding. Direct adsorption of acridine orange on chitosan derivatives was ruled out as a possible mechanism of protection on the basis of spectrophotometric measurements. Dependence of the antimutagenic properties of the studied chitosan derivatives on the degree of substitution was reversed in experiments involving acridine orange and ofloxacin, which also indicated different mechanisms of protection involved in these two cases.????
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7.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sravya G., Khasanov A. F., Krinochkin A. P., Kopchuk D. S., Slepukhin P. A., Rahman M., Zyryanov G. V., Rusinov V. L., Chupakhin O. N., Padmavathi V.
Заглавие : Aryne-mediated transformations of 3-(α- or γ-r-2-pyridyl)-1,2,4-triazines: id diels-alder reaction vs domino transformation
Место публикации : Polycyclic aromatic compounds. - 2021. - Vol. 42, № 8. - С. 4937-4947
Ключевые слова (''Своб.индексиров.''): 3-(α- or γ-r-pyridin-2-yl)-1,2,4-triaizines--influence of substituent--arynes
Аннотация: Interaction of 3-(α- or γ-R-pyridin-2-yl)-1,2,4-triazines (R = Me, CO2Me) with arynes affords either the domino-transformation products, pyrido[1,2-a]indoles, or Diels-Alder reaction ones, isoquinolines. The influence of the nature and/or position of the substituent on the reaction pathway is discussed.
doi.org/10.1080/10406638.2021.1962371
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8.

Вид документа : Статья из журнала
Шифр издания : 54/B 12
Автор(ы) : Egorova D. O., Gorbunova T. I., Pervova M. G., Demakov V. A.
Заглавие : Bacterial degradation of a mixture obtained through the chemical modification of polychlorinated biphenyls by polyethylene glycols [Электронный ресурс]
Место публикации : Applied Biochemistry and Microbiology. - 2014. - Vol. 50, № 7. - С. 722-729
Систем. требования: http://download-v2.springer.com/static/pdf/131/art%253A10.1134%252FS0003683814070023.pdf?token2=exp=1428652880~acl=%2Fstatic%2Fpdf%2F131%2Fart%25253A10.1134%25252FS0003683814070023.pdf*~hmac=3182eca3e5ccea6ab1f49dd6b89a557b80a88fa01d0e203f57bcd3fed34fc4d2
Примечания : Bibliogr. : p. 729 (29 ref.). - 10.04.15
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): bacterial degradation--chemical modification--polyethylene glycols
Аннотация: Polychlorinated biphenyls (PCBs), also known by the trade name Sovol, are toxic industrial wastes. They have been subjected to chemical treatment by polyethylene glycols (PEGs) and potassium hydroxide. As a result of the interaction of the Sovol with various molecular mass PEGs (MMPEG-4 ∼ 200, MMPEG-22 ∼ 1000), water-soluble mixtures M1 and M2 containing mono(polyethylene glycol)oxy-derivatives (PCB-PEG-4 and PCB-PEG-22), polychlorobiphenylols, and unreacted PCB congeners (PCB 44, PCB 47, PCB 49, PCB 52, and PCB 66) were obtained. It was shown for the first time that mixtures M1 and M2 are susceptible to bacterial degradation without their fractionation. According to the gas-liquid chromatography with flame-ionization and mass-spectrometric detection, the Rhodococcus wratislaviensis KT112-7 strain degraded all of the chemical compounds occurring in the mixtures. In a 5-day experiment, it was found that the KT112-7 strain decomposes mono(polyethylene glycol)oxy-derivatives completely (by 100%) and polychlorobiphenylols and PCB congeners by 90–95% in the M1 and M2 mixtures. The culture medium did not contain transformation products, whereas free chlorine ions were accumulated (72–94% of the maximum possible amount). Thus, the use of the chemical modification and consecutive bacterial degradation provided an effective destruction of technical PCB mixtures with a high content of highly chlorinated congeners
\\\\expert2\\nbo\\Applied Biochemistry and Microbiology\\2014, v.50, N 7, p.722-729.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : 54/C 45
Автор(ы) : Ivshina N. N., Bartashevich E. V., Potemkin V. A., Grishina M. A., Ishmetova R. I., Rusinov G. L., Latosh N. I., Slepukhin P. A., Charushin V. N.
Заглавие : Changes in the vibrational characteristics of substituted 1,2,4,5-tetrazines after complexation with 1,2,3-benzotriazole: A theoretical study [Electronic resource]
Место публикации : Journal of Structural Chemistry. - 2009. - Vol. 50, № 6. - С. 1053-1058
Систем. требования: http://www.springerlink.com/content/ag50570h40011132/fulltext.pdf
Примечания : 2.11.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The complexation of 3,6-substituted 1,2,4,5-tetrazines with benzotriazole was studied theoretically based on the vibrational spectra. For model complexes, the energy was minimized by the geometrical parameters, and the spectral characteristics were calculated by the PM3 method. The shift of the bond vibration frequencies of the atoms involved in complexation after the formation of different various intermolecular contacts was determined. This made it possible to determine the type of intermolecular interaction and suggest the structures of the complexes
\\\\Expert2\\nbo\\Journal of Structural Chemistry\\2009, V. 50, N 6, p.1053.pdf
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10.

Вид документа : Статья из журнала
Шифр издания : 54/C 51
Автор(ы) : Bushkova O. V., Andreev O. L., Batalov N. N., Shkerin S. N., Kuznetsov M. V., Koryakova O. V., Song E. N., Chung H. J.
Заглавие : Chemical interactions in the cathode half-cell of lithium-ion batteries: Part I. Thermodynamic simulation
Место публикации : Journal of Power Sources. - 2006. - Vol. 157, № 1. - С. 477-482
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The method of thermodynamic simulation was used to study chemical interactions in the cathode half-cell of lithium-ion battery, which contained LiCoO2 as cathode active material and a LiPF6 solution as the electrolyte. It was shown that in the temperature range 298–400 K in thermodynamic equilibrium state a layer of solid products of chemical reaction formed on the cathode/electrolyte interface. The layer predominantly consisted of LiF and LiPO3 in the molar ratio about 2:1 (corresponding to the volume ratio 2:3). In equilibrium state also some soluble interaction products formed, namely: CoF2 (considerable quantity), POF3 and PF5. The concentration of the later two substances was small, but it increased with increase of the temperature. Furthermore, in equilibrium state oxygen gas formed as a product of chemical interactions in cathode half-cell.????Thermodynamic characteristics of Co2O3 and LiCoO2 compounds were determined using a set of calculation methods??
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