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Общее количество найденных документов : 112
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1.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smyshliaeva L. A., Varaksin M. V., Fomina E. I., Medvedeva M. V., Svalova T. S., Kozitsina A. N., Charushin V. N., Chupakhin O. N., Demidov O. P., Borovlev I. V., Mensch C., Mampuys P., Maes B. U. W.
Заглавие : 1,3,7-triazapyrene-based ortho-carborane fluorophores: convenient synthesis, theoretical studies, and aggregation-induced emission properties
Место публикации : Organometallics. - 2021. - Vol. 40, № 16. - С. 2792-2807
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A convenient transition-metal-free approach, based on nucleophilic substitution of hydrogen (SNH), for consecutive regioselective C–H functionalization of 1,3,7-triazapyrene scaffolds with carboranyllithium and phenyllithium is reported. The theoretical calculations disclosed highlight key features in the regioselectivity and mechanism of the investigated SNH transformations. The novel 1,3,7-triazapyrene-based ortho-carboranes obtained have large potential in the field of molecular electronics as organic luminophores, which are characterized by the aggregation-induced emission and dual-emission effects.
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2.

Вид документа : Статья из журнала
Шифр издания : 54/A 10
Автор(ы) : Verbitskiy E. V., Rusinov G. L., Chupakhin O. N., Charushin V. N.
Заглавие : A new route towards dithienoquinazoline and benzo[f]thieno[3,2-h]quinazoline systems using Pd-catalyzed intramolecular cyclization under microwave irradiation [Электронный ресурс]
Место публикации : ARKIVOC. - 2016. - № 4. - С. 204-216
Систем. требования: http://apps.webofknowledge.com/full
Примечания : 1.11.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): pyrimidines --intramolecular cyclizations --fused ring systems--thienoacenes
Аннотация: A novel synthetic route to novel thienoacene systems bearing a fused pyrimidine ring is proposed. The commercially available 5-bromopyrimidine is used as the starting material to obtain various dithienoquinazoline and benzo[f]thieno[3,2-h] quinazoline systems through the Suzuki cross-coupling, nucleophilic aromatic substitution of hydrogen (the S-N(H) reaction), and finally palladium-catalyzed intramolecular cyclization under microwave irradiation. Redox properties of some of the new compounds have been investigated. The data obtained show that these systems have plausible potential for use in organic electronic applications.
\\\\expert2\\NBO\\ARKIVOC\\2016, p.204-216.pdf
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3.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Taniya O. S., Fedotov V. V., Sadieva L. K., Krinochkin A. P., Kovalev I. S., Kopchuk D. S., Zyryanov G. V., Ulomsky E. N., Rusinov V. L., Charushin V. N., Novikov A. S., Liu Y.
Заглавие : Abnormal push-pull benzo[4,5]imidazo[1,2-a][1,2,3]triazolo[4,5-e]pyrimidine fluorophores in planarized intramolecular charge transfer (PLICT) state: Synthesis, photophysical studies and theoretical calculations
Место публикации : Dyes and Pigments. - 2022. - Vol. 204. - Ст.110405
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The combination of excellent luminescence with high solvent polarity effect and aggregation induced emission (AIE) is an ideal combination for creating fluorophores/probes with high microenvironmental sensitivity. However, many push-pull chromophores of the D−A type in common intramolecular charge transfer (ICT) state with a significant solvatochromic effect and AIE activity, have poor luminescent properties. Herein, to overcome this problem by using reactions of nucleophilic aromatic hydrogen substitution (SNH), we have designed a series of novel 4-heteroaryl-substituted 2-aryl-2H-benzo[4,5]imidazo[1,2-a][1,2,3]triazolo[4,5-e]pyrimidine fluorophores possessing a planarized intramolecular charge transfer (PLICT) state. All these fluorophores exhibited high luminescence quantum yields (up to 60%) and large Stokes shift values of up to 7459 cm−1. Among them, the fluorophore 4h was found to exhibit the most pronounced positive solvatochromic effect and the probe 4f exhibited the most pronounced aggregation induced emission characteristics. This AIE behavior was further confirmed by means of time-resolved fluorescence lifetime measurements as well as DFT-assisted geometry optimization studies. In the presence of trifluoroacetic acid (TFA) compound 4h exhibited a well-pronounced acidochromism via visible color change from yellow-green to orange which returned to the original yellow-green solution after the addition of triethylamine (TEA). The Stern-Volmer constant for the probe 4h towards TFA was 38 M−1. Finally, for the compounds 4f, g, h theoretical calculations in the ground and excited states in different solvents were carried out to confirm the PLICT process. Based on all above the herein reported PLICT fluorophores 4a-h can be successfully applied as biological probes and optical switches.
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4.

Вид документа : Статья из журнала
Шифр издания : 54/A 23
Автор(ы) : Utepova I. A., Trestsova M. A., Chupakhin O. N., Charushin V. N., Rempel A. A.
Заглавие : Aerobic oxidative C-H/C-H coupling of azaaromatics with indoles and pyrroles in the presence of TiO2 as a photocatalyst [Электронный ресурс]
Место публикации : Green Chemistry. - 2015. - Vol. 17, № 8. - С. 4401-4410
Систем. требования: http://apps.webofknowledge.com/
Примечания : Bibliogr. : p. 4409-4410 (30 ref.). - 18.01.2016
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): bond activation--inhibitors--hydrogen
Аннотация: In this paper we wish to report a highly selective and benign method for the double C-H/C-H coupling of azaaromatics with indoles or pyrrole in the presence of air oxygen/TiO2, as an effective photocatalytic oxidative system. It has been shown that this versatile approach can be applied for direct C-H functionalisation of a variety of azaaromatic systems, such as mono-, di- and triazines, substituted and unsubstituted azines and their benzo-annelated analogues.
\\\\expert2\\nbo\\Green Chemistry\\2015, v.17, N 8, p.4401-4410.pdf
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5.

Вид документа : Статья из журнала
Шифр издания : 54/A 81
Автор(ы) : Kopchuk D. S., Nikonov I. L., Zyryanov G. V., Nosova E. V., Kovalev I. S., Slepukhin P. A., Rusinov V. L., Chupakhin O. N.
Заглавие : Aryne approach towards 2,3-difluoro-10-(1H-1,2,3-triazol-1-yl)pyrido[1,2-a]indoles [Электронный ресурс]
Место публикации : Mendeleev Communications. - 2015. - Vol. 25, № 1. - С. 13-14
Систем. требования: http://apps.webofknowledge.com/
Примечания : Bibliogr. : p. 14 (21 ref.). - 20.01.2016
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): hydrogen-bonds --fluorine--n-oxides
Аннотация: Reaction between 3-(2-pyridyl)-1,2,4-triazines and in situ generated 4,5-difluorobenzyne in toluene affords 2,3-difluoro-10-(1H-1,2,3-triazol-1-yl)pyrido[1,2-a]indoles. The structure of one representative compound was confirmed by X-ray diffraction analysis.
\\\\expert2\\nbo\\Mendeleev Communications\\2015, v.25, p. 13-14.pdf
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6.

Вид документа : Статья из журнала
Шифр издания : 54/A 94
Автор(ы) : Kozhevnikov D.N., Prokhorov A.M., Rusinov V.L., Chupakhin O.N.
Заглавие : Auto-aromatization of the sigma(H)-adducts of 1,2,4-triazine 4-oxides with carbanions in reactions of nucleophilic substitution of hydrogen [Electronic resource]
Место публикации : Mendeleev Communications. - 2000. - Vol.10, N6. - С. 227-228
Систем. требования: http://www.sciencedirect.com/science/article/pii/S0959943600709291
Примечания : 11.10.2011
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: 1,2,4-triazine 4-oxides react with stable carbanions to form 5-substituted 1,2,4-triazines as the products of deoxygenation nucleophilic substitution of hydrogen
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7.

Вид документа : Статья из журнала
Шифр издания : 54/B 62
Автор(ы) : Fokin S.V., Ovcharenko V., Romanenko G. V., Tretyakov E. V., Bogomyakov A. S., Saloutin V. I., Filyakova T. I., Saloutina L. V., Charushin V. N., Chupakhin O. N.
Заглавие : Bis(1,1,1,3,5,5,5-heptafluoro-4-iminopent-2-ene-2-aminato)copper(ii) — a new metal-containing matrix in the design of heterospin systems
Место публикации : Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2011. - Vol.60, №5. - С. 816-823
Примечания : Bibliogr. : p. 823 (11 ref.)
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): copper(ii)--bischelates--nitroxides
Аннотация: The first heterospin compounds based on bis(1,1,1,3,5,5,5 heptafluoro 4 iminopent 2 ene 2 aminato)copper(II) (CuL2) and nitronyl nitroxide radicals, 2 R 4,4,5,5 tetramethyl 4,5 dihydro 1H imidazole 3 oxide 1 oxyls (NIT R, where R = H, Me, Ph, and 1 methyl pyrazol 4 yl), were synthesized and structurally characterized. An important peculiarity of the structure of synthesized solid phases is the formation of a supramolecular structure due to hydrogen bonds between the oxygen atoms of the nitronyl nitroxide fragments of NIT R and the hydrogen atoms of the NH groups of CuL2
\\\\expert2\\NBO\\Russian Chemical Bulletin\\2011, 60 (5), 816-823.pdf
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8.

Вид документа : Статья из журнала
Шифр издания : 54/B 62
Автор(ы) : Pestov A. V., Peresypkina E. V., Virovets A. V., Podberezskaya N. V. , Yatluk Yu. G., Skorik Yu.A.
Заглавие : Bis[N-(2-hydroxyethyl)-beta-alaninato]-copper(II)
Место публикации : Acta Crystallographica Section C: Crystal Structure Communications. - 2005. - Vol. 61, № 12. - С. m510-m512
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The CuII ion in the title complex, [Cu(C5H 10NO3)2] or [Cu(He-ala)2] [He-ala = W-(2-hydroxyethyl)-?-alaninate], resides at the inversion centre of a square bipyramid comprised of two facially arranged tridentate He-ala ligands. Each He-ala ligand binds to a CuII ion by forming one six-membered ?-alaninate chelate ring in a twist conformation and one five-membered ethanolamine ring in an envelope conformation, with Cu-N = 2.017 (2) A, Cu-OCoo = 1.968 (1) A and Cu-OOH = 2.473 (2) A. The [Cu(He-ala)2] molecules are involved in a network of O-H?O and N-H?O hydrogen bonds, forming layers parallel to the (101?) plane. The layers are connected into a three-dimensional structure by van der Waals interactions, so that the molecular centres form pseudo-face-centered close packing. © 2005 International Union of Crystallography????
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9.

Вид документа : Статья из журнала
Шифр издания : Г/B 68
Автор(ы) : Akulov A. A., Varaksin M. V., Tsmokalyuk A. N., Charushin V. N., Chupakhin O. N.
Заглавие : Blue-light-promoted radical c-h azolation of cyclic nitrones enabled by selectfluor®
Место публикации : Green Chemistry. - 2021. - Vol. 23, № 5. - С. 2049-2057
ББК : Г
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: An original approach to achieve the C(sp2)–H azolation of cyclic aldonitrones mediated by Selectfluor® has first been employed. By exploiting a metal-free, visible-light-promoted cross-dehydrogenative C–N coupling reaction between model aldonitrones, 2H-imidazole 1-oxides, and NH-containing azoles, a series of novel azaheterocyclic derivatives have been obtained in yields up to 94%. The elaborated protocol has proved to be appropriate for gram-scale processes and displayed potential for utilization in the synthesis of novel structural analogues of lanabecestat. Besides, mechanistic studies have revealed that this coupling reaction is likely to proceed via a nitroxide-involving radical pathway, encompassing a chain of electron transfer events, such as hydrogen atom transfer (HAT) and single electron transfer (SET).
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10.

Вид документа : Статья из журнала
Шифр издания : 54/C 10
Автор(ы) : Gorbunov E. B., Rusinov G. L., Ulomskii E. N., Rusinov V. L., Charushin V. N., Chupakhin O. N.
Заглавие : C-H functionalization of triazolo[a]-annulated 8-azapurines [Электронный ресурс]
Место публикации : Tetrahedron Letters. - 2016. - Vol. 57, № 21. - С. 2303-2305
Систем. требования: http://apps.webofknowledge.com/full
Примечания : 26.10.16
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): fused pyrimidines--c-h functionalization--8-azapurines
Аннотация: Direct C-H functionalization of triazolo[a]-annulated 8-azapurines with phenol ethers or thiophene has been performed using the oxidative nucleophilic displacement of a hydrogen on the pyrimidine ring, proceeding through the intermediacy of the corresponding sigma(H)-adducts.
\\\\expert2\\NBO\\Tetrahedron Letters\\2016, v. 57, p. 2303.pdf
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