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91.
Jordanka Petrova Nikolai G. Vassilev Marko Kirilov 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3-4):457-463
Abstract The reaction of the lithium derivative of diethyl ester of phenylmethanephosphonic acid (1-Li) with alkanones, cycloalkanones, alkylaryl and diarylketones 2s-b is studied at -70°C in THF. The corresponding adducts-diethyl esters of l-phenyl-2,2-dialkyl(phenyl)-2-hydroxyethanephosphonic acids 3s-h are isolated, their yields being usually higher at short reaction time. The olefination of 3-Li as well as of 3 (both by thermolysis or in acidic media) proceeds in low degree, while in the case of 3-Na the yields of alkenes 4 are good. The relative configurations of 3b. 31 and 3g are determined by IR and NMR-spectra, as well as by their stereospecific olefination. “Threo”-stereoselectivity of the addition stage of the reaction of 1-Li with 2b, 21 and 2g is observed, the “threo”/“erythro” ratio remaining independent on the reaction time. 相似文献
92.
A. N. Yarkevich L. N. Petrova S. O. Bachurin 《Russian Journal of General Chemistry》2012,82(10):1659-1664
A series of dialkylamino-substituted phosphine oxides was synthesized and their physiological activity was studied. 相似文献
93.
D. O. Sinitsyn V. Yu. Lunin A. N. Grum-Grzhimailo E. V. Gryzlova N. K. Balabaev N. L. Lunina T. E. Petrova K. B. Tereshkina E. G. Abdulnasyrov A. S. Stepanov Yu. F. Krupyanskii 《Russian Journal of Physical Chemistry B, Focus on Physics》2014,8(4):457-463
X-ray serial nanocrystallography is a new technique for determining the three-dimensional structure of biological macromolecules from data on the diffraction of ultrashort pulses generated by X-ray free-electron lasers. The maximum achievable resolution for a set of experimental data as a function of the sample sizes and parameters of the equipment is estimated based on simulations of the diffraction process with allowance for changes in the electronic structure of the atoms of the sample under the influence of X-rays. Estimates show that nanocrystallography greatly enhances the possibilities of X-ray analysis, reducing the requirements for the minimum permitted size of the crystals and enabling to explore poorly crystallizable molecular objects, such as many membrane proteins and complexes of macromolecules. 相似文献
94.
A. S. Ramsh E. A. Sidorovich G. P. Petrova S. K. Kurlyand M. V. Zhuravlev O. V. Blagodatova N. V. Lebedev V. A. Gubanov 《Russian Journal of Applied Chemistry》2010,83(12):2172-2174
Samples of SKF-26 fluororubber modified by incorporating pendant methoxy groups into the macromolecular chain were studied
by dielectric spectroscopy and dynamic mechanical analysis. 相似文献
95.
A. A. Solodov T. M. Petrova Yu. N. Ponomarev A. M. Solodov E. A. Glazkova 《Molecular physics》2017,115(14):1708-1712
The absorption spectra of CO and CO2 confined in nanopores of SiO2/Al2O3 xerogel have been measured using a Bruker IFS-125 HR Fourier spectrometer. Dependences of the half-width values on rotational quantum numbers and the line shift mean values are studied and compared with the data available in literature. Possible causes which can affect the rotational dependences are discussed. 相似文献
96.
Polarization reflection holographic gratings in azobenzene-containing gelatine films 总被引:1,自引:0,他引:1
We have written polarization reflection holograms in an azobenzene-containing material. Two waves with circular polarization were used to record the gratings; the light resulting from their overlap induces chirality in the samples. The holographic reflection of the polarization gratings has the properties of Bragg reflection in cholesteric liquid crystals. 相似文献
97.
98.
N. P. Bednyagina Yu. A. Sedov G. M. Petrova I. Ya. Postovskii 《Chemistry of Heterocyclic Compounds》1972,8(3):355-357
Mono-, di-, and triheteiylformazans were obtained by the autooxidative coupling (in pyridine solution) of 1-alkyl-2-hydrazinobenzimidazoles with the aryl(azolyl)hydrazones of aliphatic or heterocyclic aldehydes.See [1] for communication XXXIII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 390–392, March, 1972. 相似文献
99.
100.