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Общее количество найденных документов : 19
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 1-10    11-19 
1.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Lavrinchenko I. A., Moseev T. D., Varaksin M. V., Charushin V. N., Chupakhin O. N.
Заглавие : BF3-mediated C-LI/C-H coupling of 1,3,7-triazapyrene with lithium alkynes -a convenient synthetic strategy towards novel aza-PAHS
Место публикации : Mendeleev 2021: book of abstracts XII international conference on chemistry for young scientists. - Saint Petersburg, 2021. - С. 585
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
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2.

Вид документа : Статья из журнала
Шифр издания : 54/C 51
Автор(ы) : Bushkova O. V., Andreev O. L., Batalov N. N., Shkerin S. N., Kuznetsov M. V., Koryakova O. V., Song E. N., Chung H. J.
Заглавие : Chemical interactions in the cathode half-cell of lithium-ion batteries: Part I. Thermodynamic simulation
Место публикации : Journal of Power Sources. - 2006. - Vol. 157, № 1. - С. 477-482
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The method of thermodynamic simulation was used to study chemical interactions in the cathode half-cell of lithium-ion battery, which contained LiCoO2 as cathode active material and a LiPF6 solution as the electrolyte. It was shown that in the temperature range 298–400 K in thermodynamic equilibrium state a layer of solid products of chemical reaction formed on the cathode/electrolyte interface. The layer predominantly consisted of LiF and LiPO3 in the molar ratio about 2:1 (corresponding to the volume ratio 2:3). In equilibrium state also some soluble interaction products formed, namely: CoF2 (considerable quantity), POF3 and PF5. The concentration of the later two substances was small, but it increased with increase of the temperature. Furthermore, in equilibrium state oxygen gas formed as a product of chemical interactions in cathode half-cell.????Thermodynamic characteristics of Co2O3 and LiCoO2 compounds were determined using a set of calculation methods??
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3.

Вид документа : Статья из журнала
Шифр издания : 54/C 91
Автор(ы) : Karpenko N. S., Filyakova V. I., Aleksandrov G. G., Charushin V. N.
Заглавие : Crystal structure of lithium 1-phenyl-4,4-difluoro-1,3-butadionate [Electronic resource]
Место публикации : Journal of Structural Chemistry. - 2005. - Vol. 46, № 5. - С. 955-959
Систем. требования: http://www.springerlink.com/content/6313545236802265/fulltext.pdf
Примечания : 2.11.2011 г.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The crystal structure of lithium 1-phenyl-4,4-difluoro-1,3-butadionate composed of-O-Li-O-bond chains was determined by XRD. In these chains, the lithium atoms, tetrahedrally coordinated with oxygen, alternate with square-bipyramidal units containing four Li-O bonds and two weak Li-F interactions
\\\\Expert2\\nbo\\Journal of Structural Chemistry\\2005, V. 46, N 5, p.955.pdf
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4.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Moseev T. D., Varaksin M. V., Virlova E. A., Chupakhin O. N., Charushin V. N.
Заглавие : Direct c-li/c-h coupling of c6f5li with azines and azoles n-oxides as efficient approach toward to polyfloorinated azaheterocycles
Место публикации : Actual problems of organic chemistry and biotechnology. - Екатеринбург, 2020. - С. 276-277
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): c-c coupling--nucleophilic substitution of hydrogen--fluorine--fluorarenes
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5.

Вид документа : Статья из журнала
Шифр издания : 24/D 62
Автор(ы) : Varaksin M. V., Moseev T. D., Charushin V. N., Chupakhin O. N.
Заглавие : Direct C-Li/C-H coupling of pentafluorophenyl lithium with azines - an atom- and step-economical strategy for the synthesis of polyfluoroaryl azaaromatics
Место публикации : Journal of organometallic chemistry. - 2018. - Vol. 867. - С. 278-283
ББК : 24
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): azine-n-oxides--azines--c-c coupling--c-h functionalization--pentafluorophenyl lithium
Аннотация: The SN H methodology has successfully been applied for the direct C(sp2)-H functionalization of azaaromatics through the C-Li/C-H coupling of pentafluorophenyl lithium with azines and their N-oxides. As a result, a number of novel fluorinated biheterocyclic ensembles, that are of interest in the design of bioactive molecules and advanced materials, have been prepared in good to excellent yields under rather mild condition.
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6.

Вид документа : Статья из журнала
Шифр издания : 54/N 10
Автор(ы) : Pestov A. V., Skorik Yu.A., Kogan G., Yatluk Yu. G.
Заглавие : N-alkylation of chitosan by beta-halopropionic acids in the presence of various acceptors
Место публикации : Journal of Applied Polymer Science . - 2008. - Vol. 108, № 1. - С. 119-127
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: N-carboxyethylation of chitosan by -halopropionic acids in the presence of various proton and halogen ion acceptors was investigated. It has been observed that carboxyethylation of chitosan in aqueous medium is accompanied by the by-processes of hydrolysis and dehydrohalogenation of the -halopropionic acids yielding -hydroxypropionic acid, bis(2-carbox-yethyl) ether, and acrylic acid. Degree of carboxyethyl substitution (DS) of chitosan and the relative rates of the by-processes varied significantly depending on the conditions used and nature of the proton or halogen ion acceptor. At carboxyethylation of chitosan with the alkaline -bromopropionates, the DS increased in the order Cs+ Rb- K+ sim; Na+ Li-.
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7.

Вид документа : Статья из журнала
Шифр издания : 54/N 52
Автор(ы) : Tretyakov E. V., Utepova I. A., Varaksin M. V., Tolstikov S. E., Romanenko G. V., Bogomyakov A. S., Stass D. V., Ovcharenko V., Chupakhin O. N.
Заглавие : New approach to synthesis of nitronyl and imino nitroxides based on S(N)(H) methodology
Место публикации : ARKIVOC. - 2011. - Part 8. - С. 76-98: ил.
Примечания : Bibliogr. : p. 98 (36 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: It is shown that S(N)(H) approach opens new possibilities in the synthesis of polyfunctional nitronyl and imino nitroxides. It is found that the interaction of 4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl lithium salt Li1 with 3,6-diaryl-1,2,4-triazines leads to formation of the corresponding triazines bearing nitronyl nitroxide or imino nitroxide substituent at position 5 of the heterocycle. The reaction of Li1 with pyridazine-N-oxide gives rise to nitroxide with buten-3-ynyl substituent 5. Spin-labeled 5 could be readily transformed by the use of 1,3-dipolar and nucleophilic addition reactions, as well as oxidative coupling, that gives a large group of new paramagnets: 2-(1H-pyrazol-5-yl)vinyl-, 2-ethynylcyclopropyl-, 2-(3-(ethoxycarbonyl) isoxazol-5-yl)vinyl-, 1-(pyrrolidin-1-yl)but-3-ynyl-substituted nitronyl nitroxide and a diradical -2,2'-((1E,7E)-octa-1,7-dien-3,5-diyne-1,8-diyl)bis(4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-3-oxide-1-oxyl). The new nitroxides were characterized by X-ray single crystal data, ESR and static magnetic susceptibility measurements
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8.

Вид документа : Статья из журнала
Шифр издания : 54/P 49
Автор(ы) : Pestov A. V., Zhuravlev N.A., Yatluk Yu. G.
Заглавие : Synthesis in a gel as a new procedure for preparing carboxyethyl chitosan [Electronic resource]
Место публикации : Russian Journal of Applied Chemistry. - 2007. - Vol. 80, № 7. - С. 1154-1159
Систем. требования: http://www.springerlink.com/content/387g8t6264j46518/fulltext.pdf
Примечания : Bibliogr. : p. 1159 (14 ref.). - 19.10.2011
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A fundamentally new procedure of synthesis of carboxyethyl chitosan in a physical gel, ensuring higher degree of substitution at lower temperatures and lower consumption of time and chemicals, compared to the existing procedures, was developed. The structure of the resulting products was examined by diffuse reflection IR and 1H NMR spectroscopy in solutions and also 1H and 7Li broad line NMR
\\\\Expert2\\nbo\\Russian Journal of Applied Chemistry\\2007, v. 80, N. 7, p.1154.pdf
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9.

Вид документа : Статья из журнала
Шифр издания : Г/R 32
Автор(ы) : Ivoilova A. V., Tsmokalyuk A. N., Mozharovskaia P., Kozitsina A. N., Ivanova A. V., Rusinov V. L., Mikhalchenko L. V., Leonova M., Lalov A.
Заглавие : Redox conversions of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4triazolo[1,5-a]pyrimidinide l-arginine monohydrate as a promising antiviral drug
Место публикации : Molecules. - 2021. - Т. 26, № 16. - Ст.5087
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): nitro-1,2,4-triazolo[1,5a]pyrimidines--triazid--nitro group transformations--nitroaromatic compounds
Аннотация: This article presents the results of a study of electrochemical transformations in aqueous and aprotic media of 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidinide l-arginine monohydrate (1a, Triazid) obtained by electrochemical methods and ESR spectroscopy. The effect of pH on the current and the reduction potential of 1a in an aqueous Britton–Robinson buffer solution was studied. It was found that 1a is irreversibly reduced in aqueous acidic media on a glassy carbon electrode in one stage with the participation of six electrons and the formation of 5-methyl-6-amino-7-oxo-1,2,4-triazolo[1,5-a]pyrimidin. The electroreduction of 1a in DMF on a background of tetrabutylammonium salts proceeds in two stages, controlled by the kinetics of second-order reactions. In the first stage, the reduction of 1a is accompanied by protonation by the initial compound of the basic intermediate products formed in the electrode reaction (self-protonation mechanism). The second quasi-reversible stage of the electroreduction 1a corresponds to the formation of a dianion radical upon the reduction of the heterocyclic anion 5-methyl-6-nitro-7-oxo-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidin, which is formed upon the potentials of the first peak. The ESR spectrum of the radical dianion was recorded upon electroreduction of Triazid in the presence of Bu4NOH. The effect of the formation of ion pairs on the reversibility of the second peak of the 1a transformation is shown. A change in the rate and regioselectivity of the protonation of the dianion radical in the presence of Na+ and Li+ ions is assumed. The results of studying the electroreduction of 1a by ESR spectroscopy with a TEMPO trap make it possible to assume the simultaneous formation of both a nitroxyl radical and a radical with the spin density localized on the nitrogen at the 4 position of the six-membered ring
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10.

Вид документа : Статья из журнала
Шифр издания : 54/S 98
Автор(ы) : Cherprakova E. M., Verbitskiy E. V., Kiskin M. A., Aleksandrov G. G., Slepukhin P. A., Sidorov A. A., Starichenko D.V., Shvachko Yu.N., Eremenko I. L., Rusinov G. L., Charushin V. N.
Заглавие : Synthesis and characterization of new complexes derived from 4-thienyl substituted pyrimidines [Электронный ресурс]
Место публикации : Polyhedron. - 2015. - Vol. 100. - С. 89-99
Систем. требования: http://apps.webofknowledge.com/
Примечания : Bibliogr. : p. 98-99 (42 ref.). - 18.01.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): pyrimidine--cyclopalladation --magnetic-properties
Аннотация: The behavior of 4-thienyl substituted pyrimidine ligands (L1-3) has been studied for the series of their reactions with various salts of 3d metals (Co, Zn, Ni, Cu) and platinoids (Pt, Pd). In particular, mononuclear Co(OTf)(2)(L1-3)(2)(H2O)(2)(MeCN)(2) (1), binuclear Co-2(Piv)(2)(L1-3)(4) (2a,b), Cu-2(Piv)(2)(L1-3)(2) (5a,b), heterometallic polynuclear Li2Co2(Piv)(6)(L1-3)(2) (4) and chelate [(L-1)Pd(OAc)](2) (6) complexes have been obtained. The structures of all complexes have been established by X-ray diffraction. Also magnetic properties of coordination compounds 1, 2, 4 and 5 have been studied in details. In particular, mononuclear Co(II) complexes I and 4 proved to exhibit paramagnetism with large positive zero-field splitting parameters. Dinuclear Co(II) complexes 2a,b show weak antiferromagnetic interactions. Dinuclear Cu(II) complexes 5a,b demonstrate strong antiferromagnetic superexchange interactions via four carboxylate bridges. The systems 2a,b and 5a,b are isolated as exchange coupled dimers
\\\\expert2\\nbo\\Polyhedron\\2015, v.100, p.89-99.pdf
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