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Общее количество найденных документов : 12
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 1-10    11-12 
1.
Инвентарный номер: нет.
   
   C 31

   
    Catalytic effect of nanosized metal oxides on the Hantzsch reaction [Text] / O. V. Fedorova, O. V. Koryakova, M. S. Valova, I. G. Ovchinnikova, Yu. A. Titova, G. L. Rusinov, V. N. Charushin // Kinetics and Catalysis. - 2010. - Vol. 51, № 4. - P566-572
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
METAL OXIDES -- HANTZSCH REACTION -- ALUMINUM OXIDES
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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2.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis of carbon encapsulated metal (Ni and Cu) nano particles and applications for chiral catalysts [Text] / Young Rang Uhm , Hi Min Lee , O. V. Fedorova, I. G. Ovchinnikova, M. S. Valova, G. L. Rusinov, V. N. Charushin, Chang Kyu Rhee // Research on Chemical Intermediates . - 2010. - Vol. 36, № 6-7. - P867-873. - Bibliogr. : p. 873 (15 ref.)
ББК 54
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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3.
Инвентарный номер: нет.
   
   C 31

   
    Catalytic effect of nanosized metal oxides in the Biginelli reaction [Text] / O. V. Fedorova, M. S. Valova, Yu. A. Titova, I. G. Ovchinnikova, A. N. Grishakov, M. A. Uimin, A. E. Ermakov, G. L. Rusinov, V. N. Charushin // Kinetics and Catalysis. - 2011. - Vol. 52, № 2. - P226-233. - Bibliogr. : p. 233 (21 ref.)
ББК 54
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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4.
Инвентарный номер: нет.
   
   D 38

    Demin, A. M.
    Covalent surface modification of Fe3O4 magnetic nanoparticles with alkoxy silanes and amino acids [Электронный ресурс] / A. M. Demin, V. P. Krasnov, V. N. Charushin // Mendeleev Communications. - 2013. - Vol.23, №1. - P14-16
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis, spectral and electrochemical properties of pyrimidine-containing dyes as photosensitizers for dye-sensitized solar cells [Electronic resource] / E. V. Verbitskiy [и др.] // Dyes and Pigments. - 2014. - Vol.100. - С. 201-214. - Bibliogr. : p. 213-214 (37 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ORGANIC DYES -- PYRIMIDINE -- MICROWAVE-ASSISTED
Аннотация: Six novel donor–π–acceptor organic dyes bearing a pyrimidine as the anchoring group have been obtained in good yields by combination of the microwave-assisted Suzuki cross-coupling and nucleophilic aromatic substitution of hydrogen reactions. Their absorption, photoluminescence and electrochemical properties were fully investigated in detail. The infrared spectra of dyes adsorbed on TiO2 indicate the formation of coordinate bonds between the pyrimidine ring of dyes and the Lewis acid sites (exposed Tin+ cations) of the TiO2 surface. This work demonstrates that the pyrimidine rings of dye sensitizers that form a coordinate bond with the Lewis acid site of a TiO2 surface are promising candidates as the electron-withdrawing anchoring group. The data from quantum calculations show that all of the dyes are potentially good photosensitizers for dye-sensitized solar cells

\\\\expert2\\NBO\\Dyes and Pigments\\2014, v. 100, p.201-214.pdf
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6.
Инвентарный номер: нет.
   
   C 31

   
    Catalysts for enantioselective Biginelli reaction based on the composite silica-zirconia xerogels prepared using different zirconium sources [Electronic resource] / I. V. Krivtsov, Yu. A. Titova, M. V. Ilkaeva, V. V. Avdin, O. V. Fedorova, S. A. Khainakov, J. R. Garcia, G. L. Rusinov, V. N. Charushin // Journal of Sol-Gel Science and Technology . - 2014. - Vol.69, №2. - С. 448-452. - Bibliogr. : p. 452 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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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7.
Инвентарный номер: нет.
   
   E 27

   
    Effect of nanosized TiO2–SiO2 covalently modified by chiral molecules on the asymmetric Biginelli reaction [Electronic resource] / Yu. A. Titova, O. V. Fedorova, G. L. Rusinov, A. Yu. Vigorov, V. P. Krasnov, A. Murashkevich, V. N. Charushin // Catalysis Today. - 2015. - Vol. 241. - С. 270-274. - Bibliogr. : p. 274 (23 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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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8.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis of podands with dihydropyrimidine fragments based on polyethers with terminal acetoacetamide groups [Electronic resource] / E. S. Radionava, O. V. Fedorova, Yu. A. Titova, G. L. Rusinov, V. N. Charushin // Chemistry of Heterocyclic Compounds. - 2015. - Vol. 51, № 5. - С. 478-482. - Bibliogr. : p. 482 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ACETOACETAMIDE-CONTAINING PODANDS -- DIHYDROPYRIMIDINE-CONTAINING PODANDS -- ACETYLKETENE
Аннотация: Reactions of aliphatic aminopodands having different length of the polyether chain with acetoacetic ester and 2,2,6-trimethyl-4H-1,3-dioxin-4-one were studied. The interaction of aminopodands with acetoacetic ester in toluene upon sonication (60A degrees D) or heating (90A degrees D) gave podands with terminal aminocrotonate fragments. The use of dioxinone at the same temperature allowed to transform aminopodands into aliphatic acetoacetamide-containing podands. An asymmetric podand with 2-pyridone fragment was isolated as byproduct from the reaction of dioxinone with 1,5-diamino-3-oxapentane. A three-component Biginelli reaction of acetoacetamidecontaining podands with benzaldehyde and urea in the presence of catalytic amounts of polyphosphoric acid immobilized on nanosized TiO2-SiO2 oxide surface enabled the synthesis of podands with 1,4-dihydropyrimidin-2-(1De)-one fragments.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\2015, v.51, N 5, p. 478-482.pdf
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9.
Инвентарный номер: нет.
   
   F 70

   
    Fluorescent Detection of 2,​4-​DNT and 2,​4,​6-​TNT in Aqueous Media by Using Simple Water-​Soluble Pyrene Derivatives [Electronic resource] / I. S. Kovalev, O. S. Taniya, N. V. Slovesnova, G. A. Kim, S. Santra, G. V. Zyryanov, D. S. Kopchuk, A. Majee, V. N. Charushin, O. N. Chupakhin // Chemistry - An Asian Journal. - 2016. - Vol. 11, № 5. - С. 775-781. - Bibliogr. : p. 780-781 (39 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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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10.
Инвентарный номер: нет.
   

   
    Synthesis and physicochemical and catalytic properties of composites in the Sio2–Zro2 system / A. N. Murashkevich, O. A. Alisienok, E. S. Novik [et al.] // Inorganic materials. - 2020. - Vol. 56, № 4. - P430-436
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
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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