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101.
102.
103.
V. M. Prokopenko V. V. Azatyan 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2018,92(1):42-46
The transition from combustion to a chain-thermal explosion, a necessary step in the transition from deflagration combustion into detonation, is studied using the example of hydrogen oxidation. Differences between the kinetic modes of ignition and a chain-thermal explosion are discussed. 相似文献
104.
B. G. Zykov O. G. Khvostenko V. I. Khvostenko I. A. Prokopenko A. S. Yavorskii S. A. Andronati 《Russian Chemical Bulletin》1993,42(9):1517-1521
Photoelectron (PE) spectra of 20 biologically active molecules of 1,4-benzodiazepine derivatives have been measured. The spectra in the range of low ionization energies (IE) were interpreted by comparison of MNDO quantum-chemical calculation data with the perturbation theory estimations. The effect of substituents and structural changes in the series studied is felt mainly by the -MOs of ring A; theortho effect is observed in the PE spectra ofortho isomers.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1583–1587, September, 1993. 相似文献
105.
Chemistry of Natural Compounds - 相似文献
106.
Mechanisms of consumption of inhibitors in gas mixtures in different combustion modes—ignition prevention and suppression of flame propagation and detonation—have been revealed. It has been found that no more than a few hundredths of a percent of the initial reagents, including the inhibitor, are consumed for the prevention of ignition. In suppression of flame propagation and detonation, the inhibitor is consumed only in chain termination reactions. Oxygen is additionally consumed only in reactions with the products of incomplete oxidation of the inhibitor. The results have been interpreted in the framework of the theory of nonisothermal chain processes. 相似文献
107.
V. V. Azatyan I. A. Bolod’yan N. P. Kopylov S. N. Kopylov V. M. Prokopenko Yu. N. Shebeko 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2018,92(5):847-852
It is shown that the strong dependence of the rate of gas-phase combustion reactions on temperature is determined by the high values of the reaction rate constants of free atoms and radicals. It is established that with a branched chain mechanism, a special role in the reaction rate temperature dependence is played by positive feedback between the concentrations of active intermediate species and the rate of their change. The role of the chemical mechanism in the temperature dependence of the process rate with and without inhibitors is considered. 相似文献
108.
V. G. Prokopenko 《Technical Physics》2017,62(8):1139-1147
Two methods for introducing inhomogeneities into composite chaotic multiattractors have been proposed. The first method makes it possible to change the mutual arrangement of multiattractor elements. The second method allows one to preset differences between chaotic attractors forming a multiattractor. 相似文献
109.
V. M. Prokopenko S. G. Pil’o V. S. Brovarets A. N. Vasilenko B. S. Drach 《Russian Journal of General Chemistry》2010,80(1):121-126
Reactions of multicenter electrophilic substrates, 2-aryl-4-dichloromethylidene-1,3-oxazol-5(4H)-ones, with 2-aminopyridine, involved cleavage of the dihydrooxazole ring by the primary amino group of nucleophilic reagent
and subsequent cyclization to imidazopyridine derivatives. The latter reacted with morpholine and its analogs via recyclization
with formation of 5-amino-2-aryl-N-(pyridin-2-yl)-1,3-oxazole-4-carboxamides. 相似文献
110.
S. G. Pil’o V. M. Prokopenko V. S. Brovarets B. S. Drach 《Russian Journal of General Chemistry》2010,80(7):1345-1350
A convenient preparative procedure has been developed for the synthesis of previously unknown 2-aryl-5-arylsulfanyl-1,3-oxazole-4-carboxylic
acids and their functional derivatives from accessible multicenter substrates of the general formula Cl2C=C(NHCOR)C(O)OMe. The products turned out to be suitable for various subsequent transformations. Some oxazole-4-carboxylic
acid hydrazide derivatives containing a substituted oxazol-5-yl fragment at the N2 atom in the hydrazine moiety underwent recyclization on heating in acetic acid; as a result, one oxazole ring was converted
into 1,3,4-oxadiazole. 相似文献