Search

Your search keyword '"Kashin, Alexey S."' showing total 137 results
Start Over Author "Kashin, Alexey S."
137 results on '"Kashin, Alexey S."'

5. Chiral Organic Salt Supported Pd Nanoparticles as Selective Heterogeneous Catalysts of Hydrogenation Reactions.

Author

Kuznetsova, Svetlana A., Yunusov, Safar M., North, Michael, Zhereb, Vladimir P., Khakina, Ekaterina A., Naumkin, Alexander, Lobanov, Nikolai N., Khrustalev, Victor N., Chusov, Denis, Kalyuzhnaya, Elena S., Ilyin, Mikhail M., Morozov, Viacheslav V., Kashin, Alexey S., Ezernitskaya, Mariam G., and Belokon, Yuri N.

Subjects
HETEROGENEOUS catalysts, METAL-organic frameworks, NITROAROMATIC compounds, CATALYTIC activity, GROUP 15 elements
Abstract

In this study, we report the synthesis of a new type of chiral crystalline organic porous salt CF2 derived from the ionic reaction between tetrakis(4‐sulfophenyl)methane (TSPM) and the tetra‐(S)‐prolylamide of tetrakis(4‐aminophenyl)methane, (S)‐TPPM, and its ability to stabilize 2 nm palladium nanoparticles to give a novel, nonpyrophoric, chiral, catalytic material Pd@CF2. The preparation of the catalyst was very simple and conducted in water. The heterogeneous catalytic performance of Pd@CF2 was tested in hydrogen reductions of olefins and substituted nitroaromatic compounds using Pd/C as a comparison to determine the specific features of the novel catalyst. Although both types of catalysts exhibited similar catalytic activity in case of reductions of diphenylacetylene and nitrobenzene, Pd@CF2 predominantly promoted the reduction of p‐nitrobenzaldehyde to p‐aminobenzyl alcohol whereas Pd/C gave p‐toluidine. The reduction of p‐dinitrobenzene led to predominant formation of p‐nitrophenylhydroxylamine if promoted by the novel catalyst and to a mixture of products if promoted by Pd/C. In addition, the introduction of p‐alkoxy groups onto nitrobenzenes slowed down the reduction with Pd@CF2 but had no influence on Pd/C activity. A hypothesis ascribing these observations to dissimilar equilibrium distributions of nitro and polar groups within the organic framework and the palladium metal surface is proposed to rationalize the selectivity of the novel catalytic material. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

19. Biomass-Derived Ionic Liquids Based on a 5-HMF Platform Chemical: Synthesis, Characterization, Biological Activity, and Tunable Interactions at the Molecular Level

Author

Seitkalieva, Marina M., primary, Vavina, Anna V., additional, Posvyatenko, Alexandra V., additional, Egorova, Ksenia S., additional, Kashin, Alexey S., additional, Gordeev, Evgeniy G., additional, Strukova, Elena N., additional, Romashov, Leonid V., additional, and Ananikov, Valentine P., additional

Published
2021
Full Text
View/download PDF

26. OX-1 Metal–Organic Framework Nanosheets as Robust Hosts for Highly Active Catalytic Palladium Species

Author

Titov, Kirill, primary, Eremin, Dmitry B., additional, Kashin, Alexey S., additional, Boada, Roberto, additional, Souza, Barbara E., additional, Kelley, Chris S., additional, Frogley, Mark D., additional, Cinque, Gianfelice, additional, Gianolio, Diego, additional, Cibin, Giannantonio, additional, Rudić, Svemir, additional, Ananikov, Valentine P., additional, and Tan, Jin-Chong, additional

Published
2019
Full Text
View/download PDF

29. Reductive Amidation without an External Hydrogen Source Using Rhodium on Carbon Matrix as a Catalyst.

Author

Tsygankov, Alexey A., Makarova, Maria, Afanasyev, Oleg I., Kashin, Alexey S., Naumkin, Alexander V., Loginov, Dmitry A., and Chusov, Denis

Subjects
RHODIUM, RHODIUM catalysts, AMIDATION, TRANSMISSION electron microscopy, CARBON monoxide
Abstract

An efficient method for preparation of secondary amides from primary amides and aldehydes using rhodium on carbon matrix as catalyst was developed. The method does not require any external hydrogen source and carbon monoxide is used as a reducing agent. The most active rhodium catalysts were characterized by BET, TEM and XPS techniques. Unexpectedly, it was found that heterogeneous rhodium on carbon matrix works as precatalyst for homogenous active species due to leaching of rhodium to the solution. Various secondary amides were synthesized and checked for antifungal activity. 4‐Methoxy‐N‐(4‐methoxybenzyl)benzamide demonstrated promising activity against Rhizoctonia Solani. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

33. Visualization of the Mechanical Wave Effect on Liquid Microphases and Its Application for the Tuning of Dissipative Soft Microreactors

Author

Kashin, Alexey S., Degtyareva, Evgeniya S., and Ananikov, Valentine P.

Abstract

The development of approaches for creation of adaptive and stimuli-responsive chemical systems is particularly important for chemistry, materials science, and biotechnology. The understanding of response mechanisms for various external forces is highly demanded for the rational design of task-specific systems. Here, we report direct liquid-phase scanning electron microscopy (SEM) observations of the high frequency sound-wave-driven restructuring of liquid media on the microlevel, leading to switching of its chemical behavior. We show that under the action of ultrasound, the microstructured ionic liquid/water mixture undergoes rearrangement resulting in formation of separated phases with specific compositions and reactivities. The observed effect was successfully utilized for creation of dissipative soft microreactors formed in ionic liquid/water media during the sonication-driven water transfer. The performance of the microreactors was demonstrated using the example of controlled synthesis of small and uniform gold and palladium nanoparticles. The microsonication stage, designed and used in the present study, opened unique opportunities for direct sonochemical studies with the use of electron microscopy.

Published
2021
Full Text
View/download PDF

47. Modern electron microscopy in the study of chemical systems at the boundary of organic synthesis and catalysis

Author

Bukhtiyarov, Valerii I., Zaikovskii, Vladimir I., Kashin, Alexey S., and Ananikov, Valentine P.

Abstract

Electron microscopy, which has become a routine tool of materials science, heterogeneous catalysis, metallurgy and some other areas, is currently attracting increasing attention of researchers working in the area of fine organic synthesis. The modern capabilities for direct visualization of micro- and nano-objects suitable for characterization of electron beam-sensitive molecular and hybrid organic systems extend the scope of applicability of electron microscopy in chemistry. The review describes representative examples of electron microscopic investigations at the boundary of organic synthesis and catalysis.The bibliography includes 114 references.

Published
2016

49. Highly Selective Catalytic Synthesis of (E,E)-1,4-Diiodobuta-1,3-diene via Atom-Efficient Addition of Acetylene and Iodine: A Versatile (E,E)-1,3-Diene Building Block in Cross-Coupling Reactions.

Author

Ananikov, Valentine P., Kashin, Alexey S., Hazipov, Oleg V., Beletskaya, Irina P., and Starikovad, Zoya A.

Subjects
*CATALYSTS, *ACETYLENE, *IODINE, *UNIT construction, *COUPLING agents (Chemistry)
Abstract

The first practical procedure is reported for the synthesis of (E,E)-1,4-diiodobuta-1,3-diene from very simple starting materials (acetylene and I2). A pure crystalline product was obtained in a green chemical procedure utilizing the key advantages of highly selective Pt-catalyzed transformation and 100% atom efficiency of the addition reaction. The Pt catalyst was recovered and re-used in the reaction without a noticeable loss of activity. [ABSTRACT FROM AUTHOR]

Published
2011
Full Text
View/download PDF

50. Three-Dimensional Printing with Biomass-Derived PEF for Carbon-Neutral Manufacturing.

Author

Kucherov FA, Gordeev EG, Kashin AS, and Ananikov VP

Abstract

Biomass-derived poly(ethylene-2,5-furandicarboxylate) (PEF) has been used for fused deposition modeling (FDM) 3D printing. A complete cycle from cellulose to the printed object has been performed. The printed PEF objects created in the present study show higher chemical resistance than objects printed with commonly available materials (acrylonitrile butadiene styrene (ABS), polylactic acid (PLA), glycol-modified poly(ethylene terephthalate) (PETG)). The studied PEF polymer has shown key advantages for 3D printing: optimal adhesion, thermoplasticity, lack of delamination and low heat shrinkage. The high thermal stability of PEF and relatively low temperature that is necessary for extrusion are optimal for recycling printed objects and minimizing waste. Several successive cycles of 3D printing and recycling were successfully shown. The suggested approach for extending additive manufacturing to carbon-neutral materials opens a new direction in the field of sustainable development., (© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2017
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results