Центральная Научная Библиотека УрО РАН

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   M 61


    Metal and silicon oxides as efficient catalysts for the preparative organic chemistry [Electronic resource] / Yu. A. Titova, O. V. Fedorova, G. L. Rusinov, V. N. Charushin // Russian Chemical Reviews. - 2015. - Т. 84, № 12. - С. 1294-1315. - Bibliogr. : p. 1312-1315 (189 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SILICON OXIDES -- METAL OXIDES
Аннотация: Data on the use of metal and silicon oxides as catalysts of reactions which are most in demand in laboratory organic syntheses are summarized. The potential of oxide catalysts for optimization of organic reactions is demonstrated, and some mechanistic aspects of oxide action are considered. Published data on the synthetic use of single, mixed, bulk and nanosized metal and silicon oxides are presented.

\\\\expert2\\nbo\\Russian Chemical Reviews\\2015, V.84, N12, p. 1294-1315.pdf
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   A 89


    Asymmetric Biginelli Reaction Catalyzed by Silicon, Titanium and Aluminum Oxides [Electronic resource] / O. V. Fedorova, Yu. A. Titova, A. Yu. Vigorov, M. S. Toropova, O. A. Alisienok, A. Murashkevich, V. P. Krasnov, G. L. Rusinov, V. N. Charushin // Catalysis Letters. - 2016. - Vol.146, № 2. - С. 493-498

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BIGINELLI REACTION -- PHENYLETHYLAMINE -- ALUMINUM OXIDES
Аннотация: The asym. Biginelli reaction was investigated in the presence of N-[(2S,4R)-4-hydroxyprolyl]-(S)-1-phenylethylamine as chiral inducer and silicon, titanium or aluminum oxides (individual and mixed, bulk and nanosized) as heterogeneous catalysts. The synthesis of Et (4R)-6-methyl-2-oxo-4-phenyl-1,2,3,4-tetrahydropyrimidine-5-carboxylate from benzaldehyde, urea and Et acetoacetate has been described. It has been shown that all studied oxides improve chemo- and stereoselectivity of the Biginelli reaction.

\\\\expert2\\nbo\\Catalysis Letters\\2016, v.146, p.493.pdf
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    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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