V.A. Rozentsvet, O.A. Stotskaya, V.P. Ivanova, M.G. Kuznetsova, P.M. Tolstoy, S.V. Kostjuk
“Structural characterization of polybutadiene synthesized via cationic mechanism”
J. Polym. Sci. A, 2018, 56, 387-398
The microstructure of polybutadiene synthesized via cationic polymerization using TiCl4‐based initiating systems has been investigated using 1D (1Н, 2Н, and 13С) and 2D (HSQC and HMBC) NMR spectroscopy. It was found that trans‐1,4‐unit is predominant structure of unsaturated part of polymer chain. Besides, the small amount of 1,2‐structures was also detected, while cis‐1,4‐units were totally absent. The signals of carbon atoms of three types of head groups (trans‐1,4‐, 1,2‐, and tert‐butyl) and two types of end groups (trans‐1,4‐Cl and 1,2‐Cl) were identified for the first time in macromolecules of cationic polybutadiene. It was showed that tert‐butyl head groups were formed due to the presence in monomer of admixtures of isobutylene. The new methodology for calculation of the content of different structural units in polybutadiene chain as well as the head and end groups was proposed. It was established that main part of 1,2‐units distributed randomly along the polybutadiene chain as separate units between trans‐1,4‐structures.
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| Tags: Tolstoy
21.03.2018 P.M. Tolstoy has given a lecture on “NMR of Hydrogen Bonded Systems” for the Bachelor and Master students from the University of jyväskylä (Finland) during the Russian-Finnish student seminar within the framework of FIRST exchange program. Events program in Institute of Chemistry.
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A.A. Vereschagin, V.V. Sizov, P.S. Vlasov, E.V. Alekseeva, A.S. Konev, O.V. Levin
“Water-stable [Ni(salen)]-type electrode material based on phenylazosubstituted salicylic aldehyde imine ligand”
New Journal of Chemistry, 2017, 41, 13918-13928
A novel electrode material was prepared by electrochemical oxidation of [4,4′-phenylazo-2,2′-(ethylenediimino-κ2N-methyl)diphenolate-κ2O]nickel, a [Ni(II)(salen)]-type complex, in chlorinated solvent. The chemical structure of the material was explored by FTIR, NMR and XPS techniques to determine the main components of the material and the nature of the linkage between them. The morphology of the material films was explored by SEM analysis. The electrochemical properties of the new material were studied by a set of voltammetric methods and an unusual stability of the material in aqueous medium was observed.
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M.M. Efremova, R.R. Kostikov, A.V. Stepakov, T.L. Panikorovsky, V.S. Shcherbakova, A.V. Ivanov, A.P. Molchanov
“Unusual Lewis-acid catalyzed formal (3+3)-cycloaddition of azomethine imines and nitrones to N-vinylpyrroles”
Tetrahedron, 2017, 73, 671-680
The addition of Lewis acids change the reaction mechanism of the cycloaddition of N-vinylpyrroles with azomethine imine and C,N-diarylnitrones. The formal (3+3)-cycloaddition is observed instead of (3+2)-dipolar cycloaddition, which take place in the absence of catalysts. This unusual (3+3)-cycloaddition leads to heterocyclic compounds with pyrazolo[1,2-a]pyrrolo[1,2-d][1,2,4]triazine- and pyrrolo[2,1-d][1,2,5]oxadiazine cores, which are difficultly achievable by other methods.
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G. P. Kantin, M. Yu. Krasavin
“Microwave-promoted reaction of N-alk-1-enyl chloroacetamides with sodium azide unexpectedly yields 1H-imidazol-5(4H)-ones”
Mendeleev Commun., 2017, 27, 95-96
A novel method to prepare biologically relevant 1H-imidazol-5(4H)-ones from aliphatic amines, isobutyraldehyde, chloroacetyl chloride and sodium azide under microwave irradiation has been developed.
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Total in February 2014 service applications were carried out.
All together measured:
- 1848 1H spectra
- 366 13C spectra
- 87 DEPT spectra
- 41 COSY spectra
- 22 NOESY spectra
- 85 31P spectra
- 91 19F spectra
239 applications were carried out.
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