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1.
The Böckelheide reaction was accomplished with a number of imidazo[4,5-b]pyrazine N-oxides, and the N-oxidation of the resulting acetoxy(hydroxy)methyl derivatives of imidazo[4,5-b]pyrazine and 6-bromo-1-methylimidazo[4,5-b]pyrazine was studied. The hydrolytic cleavage of 6-bromo-1-methylimidazo[4,5-b]pyrazine and its 4-N-oxide was studied.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 690–693, May, 1975. 相似文献
2.
V. M. Kazakova O. G. Sokol G. G. Dvoryantseva I. S. Musatova A. S. Elina 《Chemistry of Heterocyclic Compounds》1985,21(10):1164-1168
The redox properties of 1,4-dioxides of hydroxymethyl and formyl derivatives of quinoxaline were studied by means of EPR spectroscopy and polarography. The electrochemical reduction of the 1,4-dioxides proceeds in several steps with successive deoxidation and the formation of dianions of substituted quinoxalines and is also accompanied by an intramolecular redox process. The experimentally observed hfs constants in the EPR spectra of the anion radicals formed in the reduction are in agreement with the corresponding values calculated by the INDO method.See [1] for communication 1.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1412–1416, October, 1985.The authors thank I. A. Abronin for his assistance in performing the quantum-chemical calculations. 相似文献
3.
Two isomeric mono-N-oxides of 2-aminopyrazine and the 1,4-di-N-oxide have been synthesized. A marked fall in the capacity of these compounds for nucleophilic exchange reactions and for rearrangements in acid and alkaline media has been found, which distinguishes them from the corresponding N-oxides of 2-aminoquinoxaline.For part I, see [5]. 相似文献
4.
G. P. Syrova Yu. N. Sheinker I. S. Musatova A. S. Elina 《Chemistry of Heterocyclic Compounds》1972,8(2):240-246
The PMR spectra of pyrazine, its 2-substituted derivatives, and the corresponding N-oxides and N,N-dioxides were investigated. The character of the change in the chemical shifts in the N-oxides and N,N-dioxides of unsubstituted pyrazine indicates the electron-donor effect of the NO group. An additive effect of the NO groups on the chemical shifts of the ring protons is observed in pyrazine N,N-dioxide. An appreciable interaction of the substituent with the N(1)O group and a weak interaction with the N(4)O group occur in N-oxides and N,N-dioxides of 2-substituted pyrazines. A significant increase in the ortho and meta spin-spin coupling constants of the ring protons is noted when the nitrogen atoms are oxidized. The sign of the spin-spin coupling constant (J35) through the NO group was determined.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 266–273, February, 1972. 相似文献
5.
Acoustical Physics - We consider a two-dimensional problem of diffraction of a harmonic sound wave emitted by a point sound source located near the sharp angle of an infinite wedge asymmetrically... 相似文献
6.
V. Yu. Musatova S. A. Semenov D. V. Drobot A. S. Pronin A. D. Pomogailo G. I. Dzhardimalieva V. I. Popenko 《Russian Journal of Inorganic Chemistry》2016,61(9):1111-1124
Nickel(II) dicarboxylates of unsaturated carboxylic acids (maleic (MalA), itaconic (ItA), acetylenedicarboxylic (ADCA), allylmalonic (AlMalA), glutaconic (GlutA), cis,cis-muconic (MucA) acids) were synthesized and characterized by thermal analysis and IR spectroscopy. The synthesized dicarboxylates were subjected to thermolysis, and the obtained nanocomposites were studied by transmission and scanning electron microscopy and X-ray diffraction. The synthesized metallopolymer nanocomposites were NiO and metallic Ni nanoparticles distributed over a stabilizing matrix. The formation enthalpy of dicarboxylates (ΔНr°) was calculated by the PM3 semi-empirical quantum-chemical method. The nanoparticle size was determined, and a relationship between the average nanoparticle diameter (davg) and ΔНr° was established. The microstructure and magnetic characteristics of the obtained nanocomposites, namely, the maximum and residual magnetization and the coercive force, were studied. 相似文献
7.
V. M. Kazakova O. G. Sokol G. G. Dvoryantseva I. S. Musatova A. S. Elina 《Chemistry of Heterocyclic Compounds》1980,16(3):284-287
The anion radicals formed in the electrochemical reduction of 2,3-dimethyl-quinoxoline and its N,N′-dioxide, the 6-methoxy
and 6-chloro derivatives of the N,N′-dioxide, and the preparation quinoxidine in DMF were studied. Polarographic analysis
showed that the first step in the reduction is a one-electron step and is reversible for all of the compounds except quinoxidine.
However, the EPR spectra of the primary anion radicals were recorded only for 2,3-dimethylquinoxaline and its 1,4-dioxide.
For the remaining compounds we were able to obtain anion radicals of only the reduction products, the structures of which
in a number of cases were established from the EPR spectra.
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No 3, pp. 376–380, March, 1980. 相似文献
8.
I. A. Miniakhmetov S. A. Semenov V. Yu. Musatova A. M. Reznik 《Russian Journal of Inorganic Chemistry》2013,58(11):1380-1382
Solvent extraction of rhenium from sulfuric acid solutions with aminophenol-class reagent N-(2-hydroxy-5-nonylbenzyl)-β-hydroxyethylmethylamine was studied. Solvent extraction stoichiometry was established. The structure of rhenium complex formed in solvent extraction with N-(2-hydroxy-5-nonylbenzyl)-β-hydroxyethylmethylamine was proposed on the basis of data of IR spectroscopy. Back extraction of rhenium with ammonia solutions was studied. 相似文献
9.
Alexander N. Malov Alexei Yu. Seteikin Anna V. Neupokoeva Elena S. Musatova Igor E. Golub Ludmila V. Sorokina Valery S. Fetschenko Andrey A. Vaichas 《Optik》2013
The basic physical mechanisms of laser influence on living tissues are discussed. The role of radiation monochromaticity, self-organising and non-equilibrium of laser influence, intravenous blood photomodification of and others is considered. Laser anesthesia and antistress influence is discussed. It is experimentally confirmed biological substances solution manoclusterization under the influence of laser radiation. 相似文献
10.