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E. I. Karpeiskaya

Bio: E. I. Karpeiskaya is an academic researcher from Russian Academy of Sciences. The author has contributed to research in topics: Enantioselective synthesis & Catalysis. The author has an hindex of 3, co-authored 48 publications receiving 31 citations. Previous affiliations of E. I. Karpeiskaya include National Academy of Sciences of Ukraine.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a scheme was proposed for the formation of piperazine from monoethanolamine on the catalyst Co/Al2O3; the individual steps of the catalytic process were described in the terms of coordination chemistry.
Abstract: 1. During the catalytic synthesis of piperazine from monoethanolamine in the presence of Co/Al2O3, complex compounds are formed. 2. The product isolated as a result of treatment of the catalyst after the reaction represents a complex of Co3+ with various amines contained in the reaction mixture. 3. A scheme was proposed for the formation of piperazine from monoethanolamine on the catalyst Co/Al2O3; the individual steps of the catalytic process were described in the terms of coordination chemistry.

4 citations

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TL;DR: When PdCl2 is reduced by hydrogen in the presence of S-(-)-α-phenylethylamine in chloroform, zero-valent complexes of Pd with S-( −)-α -phenylethlamine are formed as discussed by the authors, which are enantioselective catalysts for reductive aminolysis of the azlactones of dehydroacyl-aminoacids.
Abstract: When PdCl2 is reduced by hydrogen in the presence of S-(-)-α-phenylethylamine in chloroform, zero-valent complexes of Pd with S-(-)-α-phenylethylamine are formed. These are enantioselective catalysts for the reductive aminolysis of the azlactones of dehydroacyl-aminoacids.

3 citations

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TL;DR: In this paper, a readily oxidized form of Co is produced, capable of dissolving in 0.1 N iodine solution, as a result of repeated participation of Co in the process of synthesis and decomposition of the complex.
Abstract: 1. During the process of cycloamination of amino alcohols in the presence of a Co/Al2O3 catalyst, compounds of Co+ soluble in the liquid phase and methanol are formed. 2. The soluble compounds do not catalyze the process, which is heterogeneous over its entire extent. In the absence of a solid catalyst they break down, apparently playing the role of intermediate compounds. 3. As a result of the reaction, a readily oxidized form of Co is produced, capable of dissolving in 0.1 N iodine solution. It was suggested that it is formed as a result of repeated participation of Co in the process of synthesis and decomposition of the complex. 4. N-2-Hydroxypropylethylenediamine forms 2-methylpiperazine in the system of pentacyanocobaltate and cobalt acetate,α,α′-dipyridyl, and NaBH4.

3 citations

Journal ArticleDOI
TL;DR: In this article, the methanolysis of 2-methyl-4-benzylideneoxazolone-5-one in the presence of S-αp-henylethylamine, comprising hydrogenation of the C=C double bond and fission of the oxazoline ring, proceeds without the formation of intermediate products in quantity.
Abstract: 1. Reductive methanolysis of 2-methyl-4-benzylideneoxazol-5-one in the presence of S-αp-henylethylamine, comprising hydrogenation of the C=C double bond and fission of the oxazolone ring, proceeds without the formation of intermediate products in quantity. 2. Z- and E-methyl esters of benzoylaminocinnamic acids on hydrogenation in the presence of a chiral catalytic system based on PdCl2 and S-α-phenylethylamine give the methyl esters of S- and R-benzoylphenylalanine, respectively. 3. Hydrogenation of E- and Z-benzoylaminocinnamic acids gives S- and R-benzoylphenylalanine, respectively.

3 citations

Journal ArticleDOI
TL;DR: In this paper, it was found that the nature of the carrier considerably affects the activity of rhenium catalysts and this was found to be an active catalyst for cyclohexane dehydrogenation.
Abstract: 1. Rhenium, deposited on charcoal, is an active catalyst for cyclohexane dehydrogenation. It is found that the nature of the carrier considerably affects the activity of rhenium catalysts. 2. Over rhenium deposited on charcoal, n-heptane is dehydrocyclized and cumene is dehydrogenated to α-methylstyrene.

2 citations


Cited by
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TL;DR: The chemistry of binuclear palladium(II) and platinum (II) complexes has been reviewed in this paper, which deals with complexes derived from various classes of ligands and covers various aspects, viz. synthesis, spectroscopic and structural features and chemical reactivity of these complexes.

179 citations

Journal ArticleDOI
TL;DR: In this article, the X-ray structure analysis of the diastereomer (−)-Norphos/(−)-DBW, which is less soluble in ethanol, exhibits strong hydrogen bonds between the carboxylic groups of DBW and the PO groups.
Abstract: Racemisches Bicyclo[2.2.1]hept-5-en-2,3-diylbis(diphenylphosphan-oxid), Norphos, kann mit Hilfe von (−)-Di-O-benzoylweinsaure, (−)-DBW, optisch gespalten werden. Die Rontgenstrukturanalyse des in Ethanol schwerloslichen Diastereomeren (−)-Norphos/(−)-DBW zeigt starke Wasserstoffbrucken zwischen den Carboxylgruppen der DBW und den PO-Gruppierungen. Die Bindung der DBW-Carboxylgruppen an verschiedene Norphos-Einheiten fuhrt zur Ausbildung unendlicher dicht gepackter Ketten. Aus dem internen Vergleich mit (−)-DBW folgt fur (−)-Norphos die absolute Konfiguration (2R, 3R). Die durch SiHCl3-Reduktion von (+)-bzw. (−)- Norphos erhaltenen chelatbildenden Phosphane (+)-bzw. (−)-Norphos ergeben in neutralen und kationischen Rh-Komplexen bei der Hydrierung von α-(Acetylamino)zimtsaure, α-(Acetylamino)acrylsaure und Dopa-Vorstufen unter Normalbedingungen in wenigen Stunden quantitativ Aminosaurederivate mit optischen Ausbeuten zwischen 79 und 97%. Asymmetric Catalyses, V. Enantioselective Amino Acid Synthesis by Hydrogenation of Prochiral Olefins with Rh-Complexes of the New Optically Active Chelating Phosphane Norphos Racemic bicyclo[2.2.1]hept-5-en-2,3-diylbis(diphenylphosphane oxide), Norphos, can be resolved with (−)-di-O0-benzoyltartaric acid, (−)-DBW. The X-ray structure analysis of the diastereomer (−)-Norphos/(−)-DBW, which is less soluble in ethanol, exhibits strong hydrogen bonds between the carboxylic groups of DBW and the PO groups. The bonding of the DBW-carboxylic groups to different Norphos units leads to the formation of infinite close-packed chains. From the internal comparison with (−)-DBW the absolute configuration follows as (2R, 3R) for (−)-Norphos. The chelating phosphanes (+)-and (−)-Norphos, obtained by SiHCl3-reduction of (+)-and (−)-Norphos, respectively, afford neutral and cationic Rh-complexes which, with H2 at room temperature and atmospheric pressure within a few hours, give quantitative hydrogenation of α-(acetylamino)cinnamic acid, α-(acetylamino)acrylic acid and Dopa precursors. The optical yields very between 79 and 97%.

118 citations

Journal ArticleDOI
TL;DR: The kinetic resolution of azlactones by the Lewis-acid-mediated transfer of an isopropoxide ligand from the chiral ligand sphere of Ti-TADDOLate is described in this paper.

77 citations

Journal ArticleDOI
TL;DR: In this paper, the mesoporous materials viz. Zn-Al-MCM-41 and Al-MCMs-41 were characterized using several techniques, e.g. ICP-AES, XRD, FTIR, TG/DTA, Nitrogen adsorption, 27 Al-MAS-NMR, SEM, TEM, XPS and pyridine acidity (TPD and FTIR) measurements.

39 citations

Journal ArticleDOI
TL;DR: The polymer-supported palladium-imidazole complex catalyst was synthesized and characterized by various techniques such as elemental analysis, IR spectroscopy and TG analysis as mentioned in this paper, and the physicico-chemical properties such as bulk density, surface studies by BET method and swelling studies of catalyst in different solvents were investigated.
Abstract: The polymer-supported palladium-imidazole complex catalyst was synthesized and characterized by various techniques such as elemental analysis, IR spectroscopy and TG analysis. The physico-chemical properties such as bulk density, surface studies by BET method and swelling studies of catalyst in different solvents were investigated. XPS studies were carried out to identify the oxidation state of palladium in the catalyst. The morphology of the support and the catalyst was studied using scanning electron microscope. Using the synthesized catalyst, hydrogenation of benzylideneaniline and a few of its para substituted derivatives was carried out at ambient conditions. The influence of variation in temperature, concentration of the catalyst as well as the substrate on the rate of reaction was studied. The catalyst showed an excellent recycling efficiency over six cycles without leaching of metal from the polymer support.

28 citations