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1.
2.
L. A. Shchukina R. G. Vdovina Yu. B. Shvetsov A. V. Karpova 《Russian Chemical Bulletin》1962,11(2):286-288
Summary A preparative method was developed for obtaining L-and D-2-hydroxy-3-methylbutyric acids by the separation of racemic 2-hydroxy-3-methylbutyric acid with the aid of D-and L-threo-2-amino-1-p-nitrophenyl-1,3-propanediols. 相似文献
3.
A. P. Borisov L. A. Petrova T. P. Karpova V. D. Makhaev 《Russian Chemical Bulletin》1994,43(12):2107-2109
Tris(4-imino-2-pentanonato)chromium was prepared by solid-state synthesis under conditions of mechanical activation of a mixture of chromium(III) chloride and sodium 4-imino-2-pentanonate and characterized by IR spectroscopy, X-ray diffraction, and electronic absorption spectroscopy.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2227–2229, December, 1994.The present work was carried out as a part of Project No. 1.164 Mechanochemical Synthesis of Complex Compounds of The State Scientific and Technical Program Ecologically Safe Processes in Chemistry and Chemical Technology with the financial support of the Ministry of Science of the RF. 相似文献
4.
Representatives of a new class of heterocyclic quinones — quinazoline-5,6-quinones — were obtained by the oxidative animation of 6-hydroxyquinazoline, 2-phenyl-6-hydroxyquinazoline, and 4-piperidino-6-hydroxyquinazoline. 6-Hydroxyquinazolines that are not substituted in the 2 position are animated in this position during oxidation. A possible mechanism for the amination is proposed.See [1] for communication XVI.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1698–1702, December. 1971. 相似文献
5.
Galina A. Gazieva Yurii B. Vikharev Lada V. Anikina Tatyana B. Karpova Angelina N. Kravchenko Evgenii A. Permyakov Igor V. Svitanko 《Mendeleev Communications》2013,23(4):202-203
Target synthesis of substituted thioglycolurils possessing sedative activity predicted by preliminary 3D-QSAR simulation of bioactive structures has been carried out. 相似文献
6.
Andryushina V. A. Stytsenko T. S. Karpova N. V. Yaderets V. V. Zavarzin I. V. Kurilov D. V. 《Russian Chemical Bulletin》2019,68(12):2355-2358
Russian Chemical Bulletin - 3p-Methyl ether of dehydroepiandrosterone was obtained by microbiological transformation of 3ß-methyl ether of cholesterol with Mycobacterium sp.... 相似文献
7.
We briefly describe the development of thermocatalytic sensors. Problems associated with instability of sensors during their operation are outlined. We propose that for improving stability, the access of the mixture being analyzed to the reaction chamber must be limited so that the condition in which the sensor output is by many times larger than the diffusion flux of the combustible gas through the calibrated orifice is observed. Diffusion processes are analyzed to work out recommendations for improving the measurement stability by several times. 相似文献
8.
I. S. Vasil’chenko I. G. Borodkina A. S. Burlov N. V. Karpova G. M. Abakarov K. A. Lyssenko G. S. Borodkin I. E. Uflyand A. D. Garnovskii V. I. Minkin 《Russian Chemical Bulletin》2013,62(8):1809-1814
Bis-imines of 2,2′-diaminodiphenylditelluride and 2-tosylamino (9a) and 2-hydroxybenzaldehyde (9b) were prepared and studied by X-ray diffraction, heteronuclear (1H, 13C, 15N, and 125Te) magnetic resonance, and quantum chemical calculations (Pbe1pbe/DGDZVP). According to the X-ray diffraction data, compound 9b in the crystal phase has nonsymmetrical structure: one of the tellurium atoms forms hypervalent bonding with the adjacent oxygen atom, while the second one is not involved in such interaction. The NMR study showed the symmetric molecular structure of imines 9a,b in DMSO-d6 with the tellurium atoms interacting hypervalently with the C=N nitrogen atoms. 相似文献
9.
Results of measuring the damping factor of an oscillatory system the viscoinertial element of which is represented by a magnetic
fluid filling a U-shaped glass tube are considered. The role of elasticity is played by an air-filled cavity that is formed
in one of the tube legs under the piezoelectric plate attached to its end and serving for oscillation reception. A method
of measuring the oscillation damping factor is proposed, and the results of these measurements are used to determine the shear
viscosity of magnetic fluid samples as a function of magnetic field strength. 相似文献
10.
S. G. Karpova A. A. Popov 《Russian Journal of Physical Chemistry B, Focus on Physics》2008,2(6):940-946
The interrelation between the rate of ozone oxidation of oriented samples of PP and HDPE and the structural processes in the region of relaxation transitions at 50–70°C in PP and 40–60°C in HDPE was found. Within the studied temperature range, the annealing results in significant structural changes accompanied by the emergence of breaks in the temperature dependence of the rate of ozone oxidation. The chemical and temperature preannealing decreases the oxidation rate. After the chemical annealing at 96°C, the Arrhenius temperature dependence of the oxidation rate was observed. 相似文献