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   M 78


    Modification of adhesive materials based on epoxy oligomers with fluorinated organic compounds [Electronic resource] / A. V. Pestov, I. S. Puzyrev, A. Mechaev, D. I. Vichuzhanin, P. P. Matafonov // Russian Journal of Applied Chemistry. - 2014. - Vol.87, №4. - С. 474-479. - Bibliogr. : p. 478-479 (48 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
THERMAL ANALYSIS -- ORGANIC DERIVATIVES -- EPOXY RESINS
Аннотация: N-Containing perfluoropentanoic acid derivatives were used as modifying additives to commercial epoxy resins. As shown by differential thermal analysis, the fluorinated organic derivatives exhibit catalytic activity in curing of epoxy resins. The following characteristics of the adhesive compounds in the cured state were determined: degree of swelling, gel fraction content, ultimate shear strength of the adhesive joint, adhesion to low-carbon St.3 steel and AMg-6 aluminum-magnesium alloy, and corrosion-protective properties with respect to these materials

\\\\expert2\\nbo\\Russian Journal of Applied Chemistry\\2014, v. 87, N 4, p.474-479.pdf
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   P 80


    Polychlorinated biphenyls: Correlation between experimental data and quantum-chemical simulation / T. I. Gorbunova, J. O. Subbotina, V. I. Saloutin, O. N. Chupakhin // Russian Journal of General Chemistry. - 2014. - Vol.84, №3. - С. 486-495. - Bibliogr. : p. 494-495 (43 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
POLYCHLORINATED BIPHENYLS -- SOVOL MIXTURE -- NUCLEOPHILIC SUBSTITUTION
Аннотация: In order to comprehend the data on reactivity of polychlorinated biphenyls of the Sovol mixture in nucleophilic substitution reactions we have performed quantum-chemical simulation using the RB3LYP\6-31G(d) gas phase approximation. Using the "Atoms-in-Molecules" approach, we have computed charges on the biphenyl carbon atoms adjacent to chlorine; furthermore, absolute chemical hardness and global electrophilicity index have been determined for the studied chlorobiphenyls. The calculated descriptors have been correlated with experimentally determined reactivity of the biphenyls in the hard acid-hard base nucleophilic reactions. The higher reactivity of more chlorinated substrates has been confirmed

\\\\expert2\\nbo\\Russian Journal of General Chemistry\\2014, V. 84, N 3, p. 486–495.pdf
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   R 30


    Reactivity of polychlorinated biphenyls in nucleophilic and electrophilic substitutions [Electronic resource] / T. I. Gorbunova, J. O. Subbotina, V. I. Saloutin, O. N. Chupakhin // Journal of Hazardous Materials. - 2014. - Vol.278. - С. 491-499. - Bibliogr. : p. 498-499 (58 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CONGENERS -- DESCRIPTORS -- ELECTROPHILIC SUBSTITUTION
Аннотация: To explain the chemical reactivity of polychlorinated biphenyls in nucleophilic (SN) and electrophilic (SE) substitutions, quantum chemical calculations were carried out at the B3LYP/6-31G(d) level of the Density Functional Theory in gas phase. Carbon atomic charges in biphenyl structure were calculated by the Atoms-in-Molecules method. Chemical hardness and global electrophilicity index parameters were determined for congeners. A comparison of calculated descriptors and experimental data for congener reactivity in the SN and SE reactions was made. It is shown that interactions in the SN mechanism are reactions of the hard acid-hard base type, these are the most effective in case of highly chlorinated substrates. To explain the congener reactivity in the SE reactions, correct descriptors were not established. The obtained results can be used to carry out chemical transformations of the polychlorinated biphenyls in order to prepare them for microbiological destruction or preservation

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   Т 42


    Тиокарбамоилированные производные полиаминов для сорбционного извлечения золота, серебра и ртути из растворов тиосульфатного выщелачивания / Ю. О. Привар [и др.] // Природные опасности, современные экологические риски и устойчивость экосистем: VII Дружининские чтения: материалы Всероссийской научной конференции с международным участием. - Хабаровск : ОмегаПресс, 2018. - С. 75-79

ББК 24
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: We have suggested a one-step method for the synthesis of thi-ocarbamoyl derivatives of polyallylamine (TСPAA) and polyaminostyrene (TСPAS) in the eutectic melt thiourea/ammonium thiocyanate, that is more safe and simple in comparison with the known method of functionalization using carbon disulfide. The resulting derivatives are insoluble and can be used as sor-bents without additional cross-linking. Sorption properties of TCPAA and TCPAS toward gold, silver and mercury ions have been studied in solutions of ammonia-thiosulfate leaching of gold and silver-containing sludge of Chalgan experimental workshop, which are also contaminated with mercury. It was shown that both TCPAA and TCPAS are efficient sorbents for silver, while ef-fective recovery of gold and mercury is achieved only with low- and medium-substituted TCPAA.

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   S 98


    Synthesis of podands modified with thiosemicarbazide and fluoroalkyl(hydroxy)pyrazoline fragments / V. I. Filyakova, P. A. Slepukhin, N. S. Boltacheva, E. B. Letova, V. N. Charushin // Russian Journal of General Chemistry. - 2017. - Vol. 87, № 5. - P957-962

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
PODANDES -- X-RAY DIFFRACTION ANALYSIS -- ACETIC ACID -- ORGANIC ACIDS
Аннотация: 1,8-Bis(diisothiosemicarbazido)-3,6-dioxaoctane have been synthesized by subsequent treatment of 2,2 -(ethylenedioxy)bisethylamine with carbon disulfide, sodium chloroacetate, and hydrazine hydrate. 1,8-Bis- (diisothiosemicarbazido)-3,6-dioxaoctane has reacted with lithium 1,1-difluoropenta-2,4-dionate in glacial acetic acid to yield 1,8-bis[5R*,5 R*(5-hydroxy-5-difluoromethyl-4,5-dihydro-3-methyl-1H-pyrazol-1-yl)-1-carbothioamido]-3,6-dioxaoctane. The molecular and crystal structure of the product has been determined by X-ray diffraction analysis.

\\\\Expert2\\NBO\\Russian Journal of General Chemistry\\2017 V 87 P957.pdf
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   C 21


    Carbon deposition from aromatic solvents onto active intact 3d metal surface at ambient conditions / A. P. Safronov, G. V. Kurlyandskaya, A. A. Chlenova, M. V. Kuznetsov, D. N. Bazhin, I. V. Beketov, M. B. Sanchez-Ilarduya , A. Martinez-Amesti // Langmuir. - 2014. - Vol. 30, № 11. - С. 3243-3253

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CARBON DEPOSITION -- AROMATIC SOLVENTS -- AMBIENT CONDITIONS

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   R 30


    Reactions of 1,2,4,5-tetrazines with S-nuc / S. G. Tolshchina, R. I. Ishmetova, N. K. Ignatenko, A. V. Korotina, I. N. Ganebnuikh, V. A. Ol'shevskaya, V. N. Kalinin, G. L. Rusinov // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2011. - Vol.60, №5. - С. 985-991

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
1,2,4,5-TETRAZINES -- HETEROCYCLIC LEAVING GROUPS -- TETRAZINES
Аннотация: The reactions of 3,6-disubstituted and azoloannulated 1,2,4,5-tetrazines containing heterocyclic leaving groups with S-nucleophiles were studied. The methods of introduction of functionalized thiols, including thiol derivatives of 1,7- and 1,2-dicarba-closo-dodecaboranes, into the tetrazine ring were developed. It was established for the first time that, instead of replacement of a leaving group in the tetrazine ring, the attack of S-nucleophile at the unsubstituted carbon atom occurs in the case of imidazo[1,2-b][1,2,4,5]tetrazines to form previously unknown products of nucleophilic substitution of the hydrogen atom

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2011, 60 (5), 985-991.pdf
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   S 98


    Synthesis and inhibiting capacity of new fluorine-containing quaternary ammonium salts / T. I. Gorbunova, D. N. Bazhin, A. Ya. Zapevalov, V. I. Saloutin // Russian Journal of Applied Chemistry. - 2011. - Vol.84, №6. - С. 972-977

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SYNTHESIS -- INHIBITING CAPACITY -- AMMONIUM SALTS
Аннотация: New fluorine-containing quaternary ammonium salts exhibiting a high inhibiting capacity against hydrochloric acid corrosion of low-carbon steels were synthesized. The polarization resistance method was used to determine the uniform-corrosion rates of steel-3 and steel-35 in relation to the structure of fluorine-containing moieties of quaternary ammonium salts and their concentration

\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2011, v. 84, N 6, p.972.pdf
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   R 30


    Reaction of 3-phenyl-1,2,4-triazin-5(4H)-one under acylating conditions with natural alcohols containing an asymmetric carbon atom / I. N. Egorov, G. V. Zyryanov, P. A. Slepukhin, T. A. Tseitler, V. L. Rusinov, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 2012. - Vol.48, №4. - С. 625-633

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CARBON ATOM -- NATURAL ALCOHOLS -- CHOLESTEROL
Аннотация: This study describes the reactions of natural chiral alcohols such as borneol, isoborneol, cholesterol, and dihydrocholesterol with 3-phenyl-1,2,4-triazin-5(4H)-one in the presence of carboxylic acid anh

\\\\Expert2\\nbo\\Chemistry of Heterocyclic Compounds\\2012, v.48, N 4, p.625-633.pdf
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10.

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   I-61


    Inhibitory activity of fluorine-containing quaternary ammonium salts comprising an N-methylpiperazinyl moiety [Electronic resource] / T. I. Gorbunova, D. N. Bazhin, A. Ya. Zapevalov, V. I. Saloutin // Russian Journal of Applied Chemistry. - 2013. - Vol.86, №7. - С. 992-996. - Bibliogr. : p. 995-996 (21 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
QUATERNARY AMMONIUM SALTS -- N-METHYLPIPERAZINYL -- HYDROCHLORIC ACID CORROSION
Аннотация: New fluorine-containing quaternary ammonium salts comprising an N-methylpiperazinyl moiety, which exhibited a high inhibiting capacity against hydrochloric acid corrosion of low-carbon steel, were synthesized. The polarization-resistance method was applied to determine the uniform corrosion rate of steel-3 in relation to the structure and concentration of the fluorine-containing substituents in the salts. It was found that the structure of the fluorine-containing moiety of the quaternary ammonium salts does not significantly influence the corrosion processes

\\\\expert2\\nbo\\Russian Journal of Applied Chemistry\\2013, v. 86, N 7, p. 992.pdf
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11.

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    2-Azido-5-nitropyrimidine: Synthesis, Molecular Structure, and Reactions with N-, O-, and S-Nucleophiles [Electronic resource] / E. B. Gorbunov, R. K. Novikova, P. V. Plekhanov, P. A. Slepukhin, G. L. Rusinov, V. L. Rusinov, V. N. Charushin, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 2013. - Vol.49, №5. - P765-775. - Библиогр.: с. 775 (13 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SYNTHESIS -- 2-AZIDO-5-NITROPYRIMIDINE -- AZIDO-TETRAZOLE TAUTOMERISM
Аннотация: We describe the synthesis of 2-azido-5-nitropyrimidine and its azido-tetrazole tautomerism in various solvents and in the crystalline state. It was established that on interacting with N-nucleophiles the attack occurred at the C-2 carbon atom. The O- and S-nucleophiles attacked C-4 position of pyrimidine ring, resulting in tetrazole ring closure

\\\\expert2\\NBO\\Chemistry of Heterocyclic Compounds\\2013, v.49, N 5, p. 765-775.pdf
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12.

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   T 44


    Thermal stability of new sorption materials based on polysiloxanes / L. K. Neudachina, A. Y. Golub, E. M. Gorbunova, Yu. G. Yatluk // Glass Physics and Chemistry. - 2011. - Vol.37, №6. - С. 603-612

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
THERMAL STABILITY -- THIOCARBAMOYLATED POLYSILOXANES -- SILOXANE MATRIX
Аннотация: The thermal stability of the unmodified, aminated, and thiocarbamoylated polysiloxanes has been studied. The siloxane matrix is stable in the temperature range up to 800°C. For the first time, mass spectrometry has been applied to the analysis of the composition of the gaseous products of thermal decomposition of the studied polysiloxanes. It has been shown that, in the process of thermal decomposition, the terminal functional groups are detached and oxidized. Water, ammonia, nitrogen, carbon, and sulfur (in the case of thiourea-modified sorbent) oxides are formed predominantly. The quantitative removal of functional groups during heating up to 800°C has been confirmed by IR spectroscopy. A mechanism of thermal decomposition of polysiloxane xerogels has been proposed. It has been found that adsorption of platinum increases the thermal stability of the samples

\\\\Expert2\\nbo\\Glass Physics and Chemistry\\2011, V. 37, N 6, P.603-612.pdf
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13.

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   T 60


    TIO2/C nanocomposites prepared by thermal annealing of titanium glycerolate as anode materials for lithium-ion batteries / G. S. Zakharova, Z. A. Fattakhova, A. Ottmann, L. Moller, E. Thauer, R. Klingeler, E. I. Andreikov, I. S. Puzyrev, Q. Zhu // Journal of materials science. - 2018. - Vol. 53, № 17. - P12244-12253

ББК 24
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: TiO2/C nanocomposites have been synthesized by developing a facile route based on the annealing of titanium glycerolate in inert atmosphere at 250–850 °C. X-ray diffraction studies reveal that the annealing temperature determines the crystal structure of the TiO2 phase in the compounds, which can be amorphous, anatase, and rutile. In contrast, the nanosized rod-like morphology which to a certain extent is predefined by the titanium glycerolate precursor does not depend on the annealing temperature. The carbon content of the TiO2/C composites amounts to 16–29 wt% and shows up, e.g., in the characteristic Raman D and G bands. Anatase-structured TiO2/C, which is obtained at 600 °C, exhibits the best electrochemical performance among the studied materials. Without the addition of carbon black, it reaches an initial specific discharge capacity of 378 mA h g−1 at 100 mA g−1 and exhibits excellent rate capability with a capacity of 186 mA h g−1 at 1000 mA g−1.

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14.

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    Study of different carbonaceous materials as modifiers of screen-printed carbon electrodes for the triazid as potential antiviral drug / A. V. Ivoilova, N. A. Malakhova, P. N. Mozharovskaia [et al.] // Electroanalysis. - 2022. - Vol. 34, № 11. - P1745-1755
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: In this work a comparative study of Screen-Printed Carbon Electrodes (SPCE) – bare and modified by drop casting with carbonaceous nanomaterials (CNMs) as Multi Walled Carbon Nanotubes (MWCNT), Carbon Black and Functionalized Carbon Black for voltammetric determination of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidinide l-arginine monohydrate (Triazid) as a potential drug with a broad spectrum of antiviral activity is reported. Bare SPCE and CNMs modified SPCE (SPCE/CNMs) have been characterized morphologically by SEM and electrochemically by cyclic voltammetry/electrochemical impedance spectroscopy with [Fe(CN)6]4−/3− as redox probe. Significant improvement of electrochemical performances is achieved with SPCE/CNMs compared with the bare SPCE. Among SPCE/CNMs studied SPCE modified with MWCNT (SPCE/CNT) is characterized by the best combination of electrochemical properties and electroanalytical performance towards TD. The linear dynamic range is 25–200 mg L−1 (R2=0.9975) with the limit of detection – 2.8 mg L−1 Triazid using SPCE/CNT and Square-Wave Voltammetry technique. The developed sensor was successfully used for Triazid determination in the Pharmaceutical Substance “TRIAZID”. The results achieved with SPCE/CNMs after chemical binding of dissolved oxygen in 0.04 M Britton-Robinson buffer+0.04 M Na2SO3 (pH 7.2±0.2) are very useful for further development of cost-effective and time-consuming pharmaceutical routine assay.

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15.

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    N-Substituted-3-aminopropylsilsesquioxanes: synthesis, physicochemical properties, and application / M. E. Evseev, A. S. Kholmogorova, L. K. Neudachina [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 6. - P1154-1160
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
SILSESQUIOXANES -- SOL-GEL -- CARBON PASTE ELECTRODES -- RUBEANIC ACID -- DETERMINATION OF SILVER(I)
Аннотация: Synthesis and study of the physicochemical properties of silsesquioxanes modified with 3-aminopropyl, 2-aminoethyl-3-aminopropyl, and dithiooxamide groups was carried out. The obtained sorbents were characterized by thermal stability, porosity, and a high degree of functionalization; the concentration of groups grafted to the particle surface reached 2.80 mmol g−1. Modified silsesquioxanes were used as an electroactive substance for the development of indicator carbon paste electrodes (CPEs). When using a CPE with a 5% dithiooxamidated silsesquioxane content, the conditions selected for potentiometric titration of aqueous solutions containing silverI were pH 3–4, the titrant was potassium iodide. The designed sensor was successfully tested by analyzing a standard sample and a drug for silver ion content.

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16.

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    Addition of the oxirane derivatives to CO2 catalyzed by Lewis bases under mild conditions / I. S. Gabov, V. A. Kuznetsov, I. S. Puzyrev, A. V. Pestov // Russian chemical bulletin. - 2021. - Vol. 70, № 6. - P1118-1123
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CYCLIC CARBONATES -- CARBON DIOXIDE -- LEWIS BASES -- QUANTUM CHEMICAL CALCULATIONS
Аннотация: The addition of the oxirane derivatives to CO2 was found to occur without Lewis acid involvement but requires the presence of the Lewis base. The reaction was carried out at atmospheric pressure by CO2 bubbling through the starting ether in the presence of a source of halide anion or trichloroacetate anion, which provides the formation of ethylenecarbonate derivatives in preparative amounts. The reactivity of halide anions in the addition of the studied oxirane derivatives to CO2 decreases in the order I− > Br− > Cl− > F− >> Cl3CCOO−. The quantum chemical calculations of the reaction of CO2 with epichlorohydrin show that the reaction consists of consecutive processes of nucleophilic addition and nucleophilic ipso-substitution, which explains the catalytic effect of the Lewis bases and the order of their activity.

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17.

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    Синтез енаминокетонов на основе фторсодержащих алкоксиенонов / Н. В. Лосева, Ю. О. Эдилова, В. И. Салоутин [и др.] // Система управления экологической безопасностью : сборник трудов XVII международной научно-практической конференции, посвященный различным теоретическим и практическим аспектам экологической безопасности. - Екатеринбург, 2023. - С. 237-243
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 1,3-Diketenes are promising polyfunctional building blocks that can be used to obtain complex aliphatic, aromatic, and heterocyclic structures. The presence of fluorinated carbon radicals in the alkoxyenone molecule significantly affects its properties and reactivity, which makes it possible to use these substances in the development of green chemistry and increases the environmental safety of synthesis processes.

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18.

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    Influence of single-wall carbon nanotube suspension on the mechanical properties of polymeric films and electrospun scaffolds / A. A. Dokuchaeva, S. V. Vladimirov, V. P. Borodin [et al.] // International journal of molecular sciences. - 2023. - Vol. 24, № 13. - P11092
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BIOENGINEERING -- CARBON NANOTUBES -- TUBULAR SCAFFOLDS
Аннотация: Carbon nanotubes (CNTs) are used in applications ranging from electrical engineering to medical device manufacturing. It is well known that the addition of nanotubes can influence the mechanical properties of various industrial materials, including plastics. Electrospinning is a popular method for fabricating nanomaterials, widely suggested for polymer scaffold manufacturing. In this study, we aimed to describe the influence of single-walled carbon nanotube (SWCNT) suspensions on polymeric poured films and electrospun scaffolds and to investigate their structural and mechanical properties obtained from various compositions. To obtain films and electrospun scaffolds of 8 mm diameter, we used poly-ε-caprolactone (PCL) and poly(cyclohexene carbonate) (PCHC) solutions containing several mass fractions of SWCNT. The samples were characterized using tensile tests, atomic force and scanning electronic microscopy (AFM and SEM). All the studied SWCNT concentrations were shown to decrease the extensibility and strength of electrospun scaffolds, so SWCNT use was considered unsuitable for this technique. The 0.01% mass fraction of SWCNT in PCL films increased the polymer strength, while fractions of 0.03% and more significantly decreased the polymer strength and extensibility compared to the undoped polymer. The PHCH polymeric films showed a similar behavior with an extremum at 0.02% concentration for strength at break.

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19.

Инвентарный номер: нет.



    Synthesis and properties of azines functionalized graphene with extremely high adsorptive ability to Eu3+ ions / O. N. Chupakhin, A. A Musikhina, I. A. Utepova [et al.] // Flatchem. - 2022. - Vol. 33. - P100348
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: In this work, a versatile synthetic protocol for obtaining of new promising carbon materials based on the C–C coupling of graphenide lithium species with azaaromatic compounds (1,10-phenanthroline, phenyl-1,2,5-oxadiazolo[3,4-b]pyrazine) has been suggested. It was shown that more electrophilic oxadiazolopyrazine gave the product with high degree of graphene functionalization and demonstrated non-isomorphic properties. At the same time, phenanthrolinyl graphene has less functionalization degree due to a lower electrophilicity of azine. However, the large size of pores between organic residues in phenanthrolinyl graphene allows adsorbing almost 10% of Eu3+. The mesurment of adsorption isotherm showed an extremely high affinity of phenanthrolinylgraphene to Eu (III) ions in netural or alkaline conditions, and the obtained hybrid material could work at least 5 sorption/desorption cycles. The structures of azine-graphene dyads were verified by complex of modern physicochemical analyses methods (the Raman spectroscopy, FTIR, XPS, SEM, EDS and TGA analyses).

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20.

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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