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Общее количество найденных документов : 12
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 1-10    11-12 
1.

Вид документа : Статья из журнала
Шифр издания : 54/C 31
Автор(ы) : Krivtsov I. V., Titova Yu. A., Ilkaeva M. V., Avdin V. V., Fedorova O. V., Khainakov S. A., Garcia J. R., Rusinov G. L., Charushin V. N.
Заглавие : Catalysts for enantioselective Biginelli reaction based on the composite silica-zirconia xerogels prepared using different zirconium sources [Электронный ресурс]
Место публикации : Journal of Sol-Gel Science and Technology . - 2014. - Vol.69, №2. - С. 448-452
Систем. требования: http://download.springer.com/static/pdf/910/art%253A10.1007%252Fs10971-013-3242-z.pdf?auth66=1395304269_eb978aa91b5abc3459b7be6b8781338b&ext=.pdf
Примечания : Bibliogr. : p. 452 (17 ref.). - 18.03.2014
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): sol-gel method--zirconium oxychloride--silica-zirconia xerogels
Аннотация: The composite silica-zirconia xerogels have been prepared via sol-gel method using zirconium oxychloride, oxynitrate, acetate and sodium silicate as the precursors. The prepared materials have been characterized using FTIR, TG/DTA, EDX and surface area analyses. It has been established that surface area of silica-zirconia xerogels significantly depends on the zirconium source, but phase transitions and structural features of the xerogels seem to be unaffected by the choice of the zirconia precursor. Prepared xerogels increase the activity of chiral inductor in the asymmetric Biginelli reaction. The anion of the zirconium salt adsorbed on the surface of the synthesized material and the presence of Si-O-Zr heterolinkages determines the reaction yield. The highest chemo- and enantioselectivity towards formation of ee isomer have been provided by the catalyst prepared from zirconium oxychloride.
\\\\expert2\\nbo\\Journal of Sol-Gel Science and Technology\\2014, v.69, N 2, p.448-452.pdf
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2.

Вид документа : Статья из журнала
Шифр издания : 54/C 31
Автор(ы) : Fedorova O. V., Valova M. S., Titova Yu. A., Ovchinnikova I. G., Grishakov A. N., Uimin M. A., Ermakov A. E., Rusinov G. L., Charushin V. N.
Заглавие : Catalytic effect of nanosized metal oxides in the Biginelli reaction
Место публикации : Kinetics and Catalysis. - 2011. - Vol. 52, № 2. - С. 226-233
Примечания : Bibliogr. : p. 233 (21 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The effect of nanosized metal oxides on the regio- and stereoselectivity of the multicomponent Biginelli reaction and the reaction mechanism under conditions of heterogeneous catalysis were studied. It was found that the considerable activation of reagents occurred on the surface of metal nanooxides. The Biginelli reaction occurred by two mechanisms: a carbocationic mechanism took place along with the generally accepted mechanism (through the N-acyliminium ion). Nanosized metal oxides in the presence of chiral inductors increased the regio- and stereoselectivity of the Biginelli reaction
\\\\Expert2\\nbo\\Kinetics and Catalysis\\2011, v. 52, N 2, p. 226.pdf
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3.

Вид документа : Статья из журнала
Шифр издания : 54/C 31
Автор(ы) : Fedorova O. V., Koryakova O. V., Valova M. S., Ovchinnikova I. G., Titova Yu. A., Rusinov G. L., Charushin V. N.
Заглавие : Catalytic effect of nanosized metal oxides on the Hantzsch reaction
Место публикации : Kinetics and Catalysis. - 2010. - Vol. 51, № 4. - С. 566-572
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The effect of nanosized copper and aluminum oxides, which have a higher sorption capacity than that of bulk samples, on the Hantzsch reaction was studied. The adsorption of starting benzaldehydes and ethyl acetoacetate on the surface of copper and aluminum nanooxides resulted in the activation of these molecules and accelerated the Hantzsch reaction. In addition, considerable activation of ammonia and intermediates (chalcone and enamine) on the surface of aluminum nanooxide facilitated an increase in the rate and selectivity of the process. The experimental results were used to develop a one-pot method for the preparation of nifedipine and nitrendipine
\\\\Expert2\\nbo\\Kinetics and Catalysis\\2010, v. 51, N 4, p. 566-572.pdf
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4.

Вид документа : Статья из журнала
Шифр издания : 54/D 38
Автор(ы) : Demin A. M., Krasnov V. P., Charushin V. N.
Заглавие : Covalent surface modification of Fe3O4 magnetic nanoparticles with alkoxy silanes and amino acids
Место публикации : Mendeleev Communications. - 2013. - Vol.23, №1. - С. 14-16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): fe3o4 --magnetic nanoparticles --alkoxy silanes
Аннотация: (3-Aminopropyl)silane-modified magnetic nanoparticles containing ε-aminocaproic acid and l-lysine fragments with free functional groups were obtained by the surface modification of Fe3O4 with alkoxysilane derivatives
\\\\Expert2\\NBO\\Mendeleev Communications\\2013, v.23, p. 14.pdf
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5.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Demin A. M., Vakhrushev A. V., Valova M. S., Minin A. S., Kuznetsov D. K., Uimin M. A., Shur V. Ya., Krasnov V. P., Charushin V. N.
Заглавие : Design of SiO2/aminopropylsilane-modifi ed magnetic Fe3O4 nanoparticles for doxorubicin immobilization
Место публикации : Russian chemical bulletin. - 2021. - Vol. 70, № 5. - С. 987-994
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): magnetic nanoparticles --n-phosphonomethyliminodiacetic acid--doxorubicin--sio2 coating--sorption
Аннотация: Surface modifi cation of magnetic nanoparticles (MNPs) with tetramethylorthosilicate and 3-aminopropyltrimethoxysilane was studied. The use of N-phosphonomethyliminodiacetic acid for the stabilization of the initial MNPs can signifi cantly increase the coating thickness and specifi c surface area of SiO2/APS-modifi ed (APS is 3-aminopropylsilane) MNPs. The possibility of sorption of antitumor drug doxorubicin (DOX) on the synthesized nanoparticles was studied. The degree of sorption of DOX increases with an increase in the specifi c surface area of the particles.
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6.

Вид документа : Статья из журнала
Шифр издания : 54/E 27
Автор(ы) : Titova Yu. A., Fedorova O. V., Rusinov G. L., Vigorov A. Yu., Krasnov V. P., Murashkevich A., Charushin V. N.
Заглавие : Effect of nanosized TiO2–SiO2 covalently modified by chiral molecules on the asymmetric Biginelli reaction [Электронный ресурс]
Место публикации : Catalysis Today. - 2015. - Vol. 241. - С. 270-274
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0920586114000704#
Примечания : Bibliogr. : p. 274 (23 ref.). - 02.07.2015
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): nanooxide tio2–sio--biginelli reaction --asymmetric catalysis
Аннотация: The method for immobilization of chiral molecules (menthol and proline derivatives) on the mixed nanooxide TiO2–SiO2 surface has been developed. The synthesized nanocomposites were used as catalysts of the Biginelli reaction. It was shown that inactive chiral molecules, when covalently bonded to the nanooxide surface, acquired properties of a chiral inducer in the asymmetric Biginelli reaction.
\\\\expert2\\nbo\\Catalysis Today\\2015, v.241, p.270.pdf
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7.

Вид документа : Статья из журнала
Шифр издания : 54/F 70
Автор(ы) : Kovalev I. S., Taniya O. S., Slovesnova N. V., Kim G. A., Santra S., Zyryanov G. V., Kopchuk D. S., Majee A., Charushin V. N., Chupakhin O. N.
Заглавие : Fluorescent Detection of 2,​4-​DNT and 2,​4,​6-​TNT in Aqueous Media by Using Simple Water-​Soluble Pyrene Derivatives
Место публикации : Chemistry - An Asian Journal. - 2016. - Vol. 11, № 5. - С. 775-781
Примечания : Bibliogr. : p. 780-781 (39 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): herbicides--pyrene derivatives--2,4-dnt --2,4,6-tnt
Аннотация: Pyrene-contg. water-sol. probes for the fluorescent detection of nitroarom. compds. (NACs), such as explosive components (2,4-DNT and 2,​4,​6-​TNT) and herbicides (2,4-​dinitrocresol, 2,4-DNOC)​, in aq. media are reported. In the probes, the introduction of surface-​active hydrophilic heads at the periphery of lipophilic (i.e., hydrophobic) pyrene tails resulted in the formation of highly fluorescent micelle-​like aggregates​/pre-​assocs. in aq. solns. at concns. of ≤10-5M. The enhanced fluorescence quenching of the herein reported architectures is achieved in the presence of ultra-​trace amts. of TNT or 2,4-DNT with values of Stern-​Volmer quenching const. close to 1 × 105M and a detection limit as low as 182 ppb. The most hydrophilic probes demonstrated higher response to 2,​4-​DNT over TNT. Filter paper test strips impregnated with 1 × 10-​5M solns. of the probes were able to detect TNT, 2,​4-​DNT, and other NACs at levels as low as 50 ppb in water.
\\\\expert2\\NBO\\Chemistry - an Asian Journal\\2016. 11(5). P. 775-781.pdf
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8.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khonina T. G., Nikitina E. Y., Tishin D. S., Demin A. M., Krasnov V. P., Chupakhin O. N., Charushin V. N., Germov A. Y., Goloborodsky B. Y., Mikhalev K. N., Bogdanova E. A.
Заглавие : Individual iron(III) glycerolate: synthesis and characterisation
Место публикации : RSC Advances. - 2022. - Vol. 12, № 7. - С. 4042-4046
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Iron(II) and iron(III) salts of strong acids form iron glycerolates on heating at 180 °C with glycerol in the presence of an equivalent amount of alkali. Individual iron(III) glycerolate was obtained for the first time. When Fe3O4 magnetic nanoparticles were heated with glycerol, an iron(III) glycerolate shell was formed on their surface.
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9.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Murashkevich A. N., Alisienok O. A., Novik E. S., Titova Y. A., Fedorova O. V., Rusinov G. L., Charushin V. N.
Заглавие : Synthesis and physicochemical and catalytic properties of composites in the Sio2–Zro2 system
Место публикации : Inorganic materials. - 2020. - Vol. 56, № 4. - С. 430-436
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): acid-base properties--catalysis--composite--silica--specific surface area--zirconia
Аннотация: Using coprecipitation, a sol–sol method, and molecular layering, we have synthesized SiO2–ZrO2 composites with SiO2 : ZrO2 ratios from 1 : 1 to 9 : 1 and a large specific surface area, which increases with growth silicon-containing component concentration. Using adsorption of Hammett indicators, we have assessed the concentration of acid–base centers in the pK range 1.3–9.6, which has been shown to vary from 68 to 160 μmol/g. Elemental analysis and IR spectroscopy data have demonstrated the presence of not only water but also nitrate ions and carbon dioxide on the surface of the samples. It has been shown that the use of nanoparticulate SiO2–ZrO2 oxides as heterogeneous catalysts—promoters for (2S,4R)-4-hydroxyprolyl-(S)-1-phenylethylamine trifluoroacetate, a chiral inducer in the asymmetric Biginelli reaction, makes it possible to raise ee (enantiomeric excess) from 39 to 68% and the reaction yield from 29 to 55%.
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10.

Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Young Rang Uhm , Hi Min Lee , Fedorova O. V., Ovchinnikova I. G., Valova M. S., Rusinov G. L., Charushin V. N., Chang Kyu Rhee
Заглавие : Synthesis of carbon encapsulated metal (Ni and Cu) nano particles and applications for chiral catalysts
Место публикации : Research on Chemical Intermediates . - 2010. - Vol. 36, № 6-7. - С. 867-873
Примечания : Bibliogr. : p. 873 (15 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Carbon-encapsulated Ni and Cu nanoparticles with a core/shell structure were synthesized by levitational gas condensation (LGC). Methane (CH4) gas was used to coat the surface of the Ni and Cu nanoparticles. The Ni particles had a core diameter of 10 nm, and were covered by 2–3 nm thin carbon layers. In the case of Cu, the particles had a core diameter of 30 nm, and multi-shells with a thickness of 2–3 nm. Biginelli reaction in the presence of l-proline and Ni encapsulated nanoparticles was carried out to change the ratio between stereoisomers in favor of the S-enantiomer for 3,4–dihydropyrimidine (DHPM) with an excess of about 18%
\\\\Cserver\\dist\\НБО\\Электронная библиотека_Библиогр1\\Research on Chemical Intermediates\\2010, v. 36, N. 6-7, p.867.pdf
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