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1.
V. V. Davydov B. E. Zaitsev M. G. Sarabia A. É. Aliev G. V. Sheban V. L. Savel'ev V. S. Troitskaya 《Chemistry of Heterocyclic Compounds》1990,26(11):1258-1264
The structure of the previously synthesized 1,2-dihydro-3-(2-hydroxyphenyl)-4-nitropyrazol-5(3H)-one (I) was studied by 1H and 13C NMR, IR, and electronic spectra. It was established that the NMR spectra of compound (I) do not contain signals for the H atom at position 4 and the C atoms of the carbonyl groups; in the crystalline state and in solutions the IR spectra do not contain vc=o bands, while the electronic spectra do not contain absorption in the region of 250 nm. On the basis of the foregoing it is concluded that compound (I) exists in the OH form. The distribution of -electron density in the molecule of (I) and the nature of the bands in its electronic absorption spectrum were studied by quantum-chemical methods in the PPP approximation.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1510–1516, November, 1990. 相似文献
2.
All the investigated reactions of 5-cyano-1,4,6,9-trioxathia-5-phosphaspiro[4,4]nonanes with compounds containing a labile hydrogen atom proceed with the loss of HCN, predominant opening of the oxathiophospholane ring, and formation of 2-oxo-1,3,2-dioxaphospholane derivatives.A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Science Center, Russian Academy of Sciences, 420083 Kazan. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 11, p. 2670–2673, November, 1992. 相似文献
3.
A. V. Glushkov N. G. Serbov S. V. Ambrosov V. É. Orlova G. M. Dormostuchenko O. V. Troitskaya 《Journal of Structural Chemistry》1995,36(4):557-564
The excitation energies and oscillator strengths of transitions in the helium atom (as a test system) and carbon dioxide and
ethylene molecules are calculated by a modified equation-of-motion method with effective account of the most important polarization
effects, including the 2p−2h (two particles-two holes) interactions, in the quasiparticle approximation of the density functional.
Two different types of the effective potential of the partile-hole polarization interaction are used. The accuracy of the
calculations is sensitive to the type of the potential. It is shown that the account of the polarization corrections for the
2p−2h effects is of fundamental importance since it contributes up to 30% to the values of the excitation energies and oscillator
strengths.
Odessa Institute of Hydrometeorology. Translated fromZhurnal Strukturnoi Khimii, Vol. 36, No. 4, pp. 615–622, July–August, 1995.
Translated by I. Izvekova 相似文献
4.
Trukhin D. V. Rogozhnikova O. Yu. Troitskaya T. I. Kuzhelev A. A. Amosov E. V. Halpern H. J. Koval’ V. V. Tormyshev V. M. 《Russian Journal of Organic Chemistry》2019,55(3):296-301
Russian Journal of Organic Chemistry - The reaction of Finland trityl with tertiary aliphatic alcohols containing a terminal tertiary amino group, followed by quaternization of the amino groups,... 相似文献
5.
6.
S. N. Gladkikh E. N. Basharina O. L. Troitskaya S. P. Kriulina N. V. Timoshchenko I. V. Nikitushkin 《Polymer Science Series D》2012,5(3):145-149
The results of investigation of domestic impregnating and potting compounds that can function at temperatures up to 180–200°C
developed at JSC Kompozit are presented. It is shown that these materials function at temperatures up to 200°C, as well as
under conditions of elevated humidity and temperature cycling. 相似文献
7.
V. L. Savel'ev O. L. Samsonova V. S. Troitskaya V. G. Vinokurov V. P. Lezina L. D. Smirnov 《Chemistry of Heterocyclic Compounds》1988,24(7):805-810
The reaction of 3,4-diaminocoumarin with thionyl chloride gave 4H-[1]benzopyrano[3,4-c][1,2,5]thiadiazol-4-one (II), which was cleaved by the action of nucleophilic agents to the corresponding 4-(2-hydroxyphenyl)-1,2,5-thiadiazole-3-carboxylic acid derivatives. The nitration of II leads to the 8-nitro or 6,8-dinitro derivative; the latter was isolated in the form of 4-(2-hydroxy-3,5-dinitrophenyl)-1,2,5-thiadiazole-3-carboxylic acid.See [3] for our preliminary communication.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 977–981, July, 1988. 相似文献
8.
9.
The symplectic groupSp(2N
fNc) is proposed as the internal symmetry group of quark bound states; hereN
f andN
c designate respectively the number of quark flavors and that of color degrees of freedom of the quark. The effective Lagrangian of quark bound states in a quark—gluon system is constructed in the infinitely strong coupling limit. Several consequences of theSp(2N
fNc)-symmetry in the caseN
f=3 are examined.Translated from Zapiski Nauchnykh Seminarov Leningradskogo Otdeleniya Matematicheskogo Instituta im. V. A. Steklova AN SSSR, Vol. 131, pp. 47–71, 1983.The authors are grateful to I. Ya. Aref'eva, M. K. Volkov, G. V. Efimov, L. N. Lipatov, A. A. Migdal, V. N. Pervushin, and V. N. Popov for discussions and critical remarks. 相似文献
10.
A.?N.?IvanovEmail author M.?Cargnelli M.?Faber H.?Fuhrmann V.?A.?Ivanova J.?Marton N.?I.?Troitskaya J.?Zmeskal 《The European Physical Journal A - Hadrons and Nuclei》2005,25(3):329-338
We argue that due to isospin and U-spin invariance of strong low-energy interactions the S-wave scattering lengths a
0
0 and a
1
0 of ˉN scattering with isospin I = 0 and I = 1 satisfy the low-energy theorem a
0
0 +3a
1
0 = 0 valid to leading order in chiral expansion. In the model of strong low-energy ˉN interactions at threshold (Eur. Phys. J. A 21, 11 (2004)) we revisit the contribution of the Σ(1750) resonance, which does not saturate the low-energy theorem a
0
0 +3a
1
0 = 0, and replace it by the baryon background with properties of an SU(3) octet. We calculate the S-wave scattering amplitudes of K-N and K-d scattering at threshold. We calculate the energy level displacements of the ground states of kaonic hydrogen and deuterium.
The result obtained for kaonic hydrogen agrees well with recent experimental data by the DEAR Collaboration. We analyse the
cross-sections for elastic and inelastic K-p scattering for laboratory momenta 70MeV/c < p
K < 150MeV/c of the incident K--meson. The theoretical results agree with the available experimental data within two standard deviations. 相似文献