Yu V.,Bekturov Institute of Chemical Sciences |
Yu V.,Kazakh-British Technical University |
Praliyev K.,Bekturov Institute of Chemical Sciences |
Nagimova A.,Bekturov Institute of Chemical Sciences |
Zazybin A.,Kazakh-British Technical University
Tetrahedron Letters | Year: 2015
The spirocyclic compounds, 3-cyano-4-methyl-8-(2-ethoxyethyl)-1-oxa-8-azaspiro[4,5]deca-3-ene and 3-cyano-4-methyl-8-(2-phenylethyl)-1-oxa-8-azaspiro[4.5]dec-3-ene were unexpectedly obtained from the reaction of 1-(2-ethoxyethyl)-4-acetyl-4-hydroxypiperidine and 1-(2-phenylethyl)-4-acetyl-4-hydroxypiperidine with acrylonitrile at room temperature in the presence of an alkali catalyst; further hydrolysis led to the corresponding carboxylic acids. The spirocyclic compounds are thought to form via an aldol condensation which follows cyanoethylation. However, the reaction of 3-butoxypropyl-2-cyanoethylamine with 1-(2-ethoxyethyl)-4-acetyl-4-hydroxypiperidine leads to 1-(2-ethoxyethyl)-4-(1'-hydroxyethyl)-4-hydroxypiperidine. © 2015 Elsevier Ltd.
Sultanbayeva G.Sh.,Bekturov Institute of Chemical Sciences |
Holze R.,TU Chemnitz |
Chernyakova R.M.,Bekturov Institute of Chemical Sciences |
Jussipbekov U.Z.,Bekturov Institute of Chemical Sciences
Microporous and Mesoporous Materials | Year: 2013
Results of studies of the sorption activity of pristine and activated (with Na2CO3 solution) zeolite and a composite based on zeolite and bentonite with respect to Fe2+, Cu2+, Al 3+, Pb2+ are presented. The influence of zeolite particle size, activation, and its duration on the degree of sorption of heavy metal ions from phosphoric acid is reported. The activation of zeolite by sodium carbonate solution increases its sorption capacity for these ions substantially. The highest degrees of acid purification were achieved in the first 5 min of the process with removal of 60.2% for Fe, 95.4% for Al, 99.0% for Pb and 96.6% for Cu of the initial concentrations. © 2012 Elsevier Inc. All rights reserved.
Usmanov S.,Bekturov Institute of Chemical Sciences |
Toipasova U.M.,Bekturov Institute of Chemical Sciences |
Omarova G.T.,Bekturov Institute of Chemical Sciences |
Tolkyn B.,Bekturov Institute of Chemical Sciences |
Kozybakova E.B.,Bekturov Institute of Chemical Sciences
Russian Journal of Inorganic Chemistry | Year: 2014
Processes occurring in the ternary water-salt system containing monomethylolurea and sodium bicarbonate are studied using physicochemical (visual polythermal and isothermal) methods. The germinability and the energy of germination of cotton plant seeds in saline soils is shown to increase due to chemical binding of sodium bicarbonate with monomethylolurea. © 2014 Pleiades Publishing, Ltd.
Vizer S.A.,Bekturov Institute of Chemical Sciences |
Sycheva E.S.,Bekturov Institute of Chemical Sciences |
Al Quntar A.A.A.,Al-Quds University |
Kurmankulov N.B.,Bekturov Institute of Chemical Sciences |
And 2 more authors.
Chemical Reviews | Year: 2015
Researchers describe the synthetic methods and properties of mono- and dipropargyl sulfides. They provide information about the synthesis and reactions of aromatic propargyl sulfides. The synthesis of propargyl phenyl sulfides is achieved through C-S bond formation by addition of propargyl halides to sodium benzenethiolate in ethanol, which is usually accompanied by prototropic rearrangements. The synthesis of a variety of aromatic propargyl sulfides in sufficiently high yields with little or no isomerization of propargyl substituents is presented. The synthesis of propargyl-type Sulfides is investigated under conditions that enabled the formation of the desired products in quantitative yield after the development of catalytic methods for carbon-carbon and carbon-heteroatom bond formation using transition-metal complexes.
Konuspayev S.R.,Bekturov Institute of Chemical Sciences |
Kadirbekov K.A.,Bekturov Institute of Chemical Sciences |
Nurbayeva R.K.,Bekturov Institute of Chemical Sciences |
Sarsekova A.T.,Bekturov Institute of Chemical Sciences
Catalysis in Industry | Year: 2011
Natural zeolites (clinoptilolite) from the Shankanay deposit in Almaty oblast were used to prepare catalysts for the synthesis of higher α-olefins by paraffin cracking. The modification of zeolite with inorganic and organic heteropoly acids resulted in an enhancement of catalytic activity. The olefin yield on the zeolite modified with heteropoly acids was as high as 36.6% after one run in a flow system at atmospheric pressure and temperatures of 500-525°C. The modification of natural zeolite with HPA led to an increase of 22 to 257 m2/g in the total surface area. The increase in catalytic activity after HPA deposition can be attributed to the formation of stable nanostructures with sizes of 1 to 4 nm, resulting in the emergence of stronger Brønsted acid sites. The catalyst works stably in the reaction-regeneration mode. © 2011 Pleiades Publishing, Ltd.
Vorobyev P.B.,Bekturov Institute of Chemical Sciences |
Saurambaeva L.I.,Bekturov Institute of Chemical Sciences |
Mikhailovskaya T.P.,Bekturov Institute of Chemical Sciences
Russian Journal of General Chemistry | Year: 2013
The partial oxidation of 3- and 4-methylpyridines on V2O 5 and vanadium oxide catalysts doped with TiO2, Al 2O3, and ZrO2 was studied. The catalytic activities of the studied catalysts were correlated with the calculated proton affinities of the vanadyl oxygen. A possible mechanism of the surface stages of the partial oxidation of 3- and 4-methylpyridines on the vanadium oxide catalysts was discussed. © 2013 Pleiades Publishing, Ltd.
Akimkhan A.M.,Bekturov Institute of Chemical Sciences
Russian Journal of Physical Chemistry A | Year: 2013
The effect of process duration, temperature, and concentration on the adsorption of polyacrylic acid and polyacrylamide by montmorillonite is studied. It is shown that the pattern of interaction of the studied polyelectrolytes with the sorbent surface is determined by the nature of the polymers, the prevalence of acid-base sites, and the pore structure of the mineral. © 2013 Pleiades Publishing, Ltd.
Bektenova G.A.,Bekturov Institute of Chemical Sciences
Russian Journal of Physical Chemistry A | Year: 2010
Ionization constants of a number of boronic acids were determined spectrophotometrically in aqueous solutions. The effect of different substituents on their acid properties is considered. The strongest acids are shown to be phenylboronic acid derivatives containing a nitro group. A model study of the interaction between boronic acids and polyvinyl alcohol depending on pH is analyzed to reveal the optimum conditions for the formation of a stable boronate-diol complex. © Pleiades Publishing, Ltd., 2010.
Mukanova M.S.,Bekturov Institute of Chemical Sciences |
Yerzhanov K.B.,Bekturov Institute of Chemical Sciences
Russian Chemical Bulletin | Year: 2014
New mono- and diacetylenic alcohols and glycols of tetrahydrothiopyran family were synthesized. Steric structures of the individual stereoisomers of these alcohols and glycols were established based on the 1H and 13C NMR spectroscopic data. Stereochemistry of ethynylation of 2,5-dimethyltetrahydrothiopyran-4-one was studied. © 2014 Springer Science+Business Media, Inc.
Vorobyev P.B.,Bekturov Institute of Chemical Sciences |
Serebryanskaya A.P.,Bekturov Institute of Chemical Sciences
Russian Journal of General Chemistry | Year: 2012
Oxidative ammonolysis of 3(4)-methyl- and 3,4-dimethylpyridines using vanadium oxide catalyst doped with Cr2O3, SnO2, and ZrO2 was studied. The yields of nitriles and conversion of the starting compounds were found to depend on the CH-acidity of the latter in the gas phase. The possible mechanisms of the formation of pyridine-3,4-dicarboxylic acid imide at the oxidative ammonolysis of 3,4-dimethylpyridine was discussed. The relation between the activity of the modified catalysts and the proton affinity of the vanadyl oxygen calculated by the extended Hückel method was established. © 2012 Pleiades Publishing, Ltd.