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1.
Alexei Yu. Lukin Sergei V. Shevyakov Alexei V. Laptev Olga I. Davydova Vitali I. Shvets Olga V. Demina Yury P. Strokach Valery A. Barachevsky Michail V. Alfimov Sergei P. Gromov Artem I. Vedernikov Johan Lugtenburg Andrey A. Khodonov 《Journal of inclusion phenomena and macrocyclic chemistry》2004,49(1-2):153-161
An effective synthetic approach to the preparation of a new crown-ether vinylogs involving the Horner–Emmons olefination of carbonyl precursors with the use of C2- and C5-phosphonates was proposed. The effects of the conjugation chain length and the nature of the terminal polar functions in the phosphonate reagent on the yield and process stereoselectivity were discussed. 相似文献
2.
Lyashenko G. S. Dmitriev D. V. Yazovtsev I. A. Demina M. M. Albanov A. I. Medvedeva A. S. 《Russian Journal of Organic Chemistry》2003,39(10):1497-1500
Hydrosilylation of 2-(2-propynyl)-2,3-dihydro-1,2-benzothiazol-3-one 1,1-dioxide with 1-alkynyldimethyl- and bis(1-alkynyl)methylsilanes of the general formula Me
n
HSi(C=-CR)3-n (n = 1, 2) in the presence of H2PtCl6 (Speier's catalyst) occurs in a nonregioselective but stereoselective fashion, yielding mixtures of the corresponding trans-- and -adducts. The fraction of the latter ranges from 50 to 70%, depending mainly on the substrate nature rather than on the nature of substituent at the triple bond of the reagent. 相似文献
3.
A very large diversity space of synthetically accessible compounds for use with drug design programs
Nikitin S Zaitseva N Demina O Solovieva V Mazin E Mikhalev S Smolov M Rubinov A Vlasov P Lepikhin D Khachko D Fokin V Queen C Zosimov V 《Journal of computer-aided molecular design》2005,19(1):47-63
We have constructed a very large virtual diversity space containing more than 1013 chemical compounds. The diversity space is built from about 400 combinatorial libraries, which have been expanded by choosing sizeable collections of suitable R-groups that can be attached to each link point of their scaffolds. These R-group collections have been created by selecting reagents that have drug-like properties from catalogs of available chemicals. As members of known combinatorial libraries, the compounds in the diversity space are in general synthetically accessible and useful as potential drug leads. Hence, the diversity space can be used as a vast source of compounds by a de novo drug design program. For example, we have used such a program to generate inhibitors of HIV integrase enzyme that exhibited activity in the micromolar range. 相似文献
4.
Alexey V. Laptev Dmitrii E. Pugachev Alexey Yu. Lukin Andrei V. Nechaev Nikolay E. Belikov Olga V. Demina Petr P. Levin Andrey A. Khodonov Andrey F. Mironov Sergei D. Varfolomeev Vitalii I. Shvets 《Mendeleev Communications》2013,23(4):199-201
A new 5,10,15,20-tetrasubstituted porphyrin containing four 6’-nitro-1,3,3-trimethylspiro(indolino-2,2’-2H-chromene) substituents and its complexes with Zn2+ and Cu2+ ions were prepared and characterized by physicochemical methods of analysis. 相似文献
5.
6.
Irina V. Falina Olga A. Demina Natalia A. Kononenko Lidia A. Annikova 《Journal of Solid State Electrochemistry》2017,21(3):767-775
In this work, the results of investigation of the influence of inert binder and reinforcing fabric on structural organization and mechanism of current transfer in homogeneous and heterogeneous ion-exchange membranes are presented by theoretical analysis of parameters of the extended three-wire conductivity model. It was established that analogy in reorganization of the current paths takes place in the course of inclusion of the reinforcing fabric in perfluorinated membranes and addition of polyethylene and nylon 6 to ion-exchange resins during preparation of heterogeneous membranes. In comparison with perfluorinated membranes, the essential difference in conducting properties of heterogeneous membranes is the opportunity for the current transfer via the channel filled with equilibrium solution. The size of this channel decreases with increase in the volume fraction of the inert component inside the membrane. 相似文献
7.
One of the approaches to enhancing drug efficiency consists in the development of drug delivery systems. Development, research, and standardization of biologically available, functional, molecularly structured systems with unique mechanical, physicochemical, and other properties requires joint effort of many disciplines: from materials science to pharmacy. The main goal of the development of drug delivery systems is to prolong residence of a drug in biological fluids (this first of all relates to readily soluble pharmaceutical substances), ensure targeted action (especially with highly toxic substances), and enhance solubility for improving its bioavalability (with sparingly soluble substances). 相似文献
8.
A. V. Voronin A. E. Aleksandrov B. Ya. Ber P. N. Brunkov A. A. Bormatov V. K. Gusev E. V. Demina A. N. Novokhatskii S. I. Pavlov M. D. Prusakova G. Yu. Sotnikova M. A. Yagovkina 《Technical Physics》2016,61(3):370-376
We report on experimental results on multiple action of hydrogen, deuterium, and helium plasmas produced by a plasma gun and the Globus-M tokamak on tungsten. The surface temperature in the course of irradiation is measured with a bichromatic pyrometer with a time resolution of ?1 μs. The morphology of the surface layer is investigated and X-ray structure analysis of tungsten exposed to multiple radiations by the plasma under various conditions is carried out. A slight decrease in the lattice parameter in the sample subjected to the maximal number of irradiation cycles is detected. It is shown that the morphology of the tungsten surface irradiated by the hydrogen plasma from the gun and by the deuterium plasma from the Globus-M tokamak changes (the structure becomes smoother). The characteristic depth of the layer in which impurities have been accumulated exceeds 0.5 μm. This depth was the largest for the sample exposed to 1000 shots from the gun and 2370 shots from the tokamak. It is shown that the helium jet from the plasma gun makes it possible to simulate the action of helium ions on the International Thermonuclear Experimental Reactor (ITER) diverter, producing a layer of submicrometer particles (bubbles). 相似文献
9.
A. V. Zdoroveyshchev M. V. Dorokhin O. V. Vikhrova P. B. Demina A. V. Kudrin A. G. Temiryazev M. P. Temiryazeva 《Physics of the Solid State》2016,58(11):2267-2270
The magnetic properties of Co45Pt55 films deposited by electron-beam evaporation in vacuum have been studied. The measurements of the Faraday and Kerr magnetooptical effects confirm the presence of the easy-magnetization axis perpendicular to the Co45Pt55 surface. It is shown that the perpendicular magnetic anisotropy and the residual magnetization are retained at 300 K for a long time. The magnetic characteristics of the Co45Pt55 layer surface have been studied by magnetic force microscopy, and “circular” mobile magnetic structures have been detected. The spin light-emitting diodes based on In(Ga)As/GaAs heteronanostructures with Co45Pt55 contact layers were fabricated. These diodes emit circularly-polarized light in the absence of an external magnetic field. 相似文献
10.
Kudrin A. V. Dorokhin M. V. Zdoroveishchev A. V. Demina P. B. Vikhrova O. V. Kalent’eva I. L. Ved’ M. V. 《Physics of the Solid State》2017,59(11):2223-2225
Physics of the Solid State - A photoconductive detector of circularly polarized radiation based on the metal–insulator–semiconductor structure of CoPt/(Al2O3/SiO2/Al2O3)/InGaAs/GaAs is... 相似文献