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V. P. Zvolinskii P. I. Zakharov V. K. Shevtsov A. V. Varlamov V. G. Pleshakov G. A. Vasil'ev N. S. Prostakov 《Chemistry of Heterocyclic Compounds》1978,14(2):200-203
The dissociative ionization of 4-azafluorene and its methyl and phenyl derivatives was investigated. The relative intensity of the [M — CH3]+ ion peak depends on the position of the CH3 group in the 4-azafluorene ring. It was established that the loss of an RCN particle (R=H, CH3, and C6H5) for unsubstituted 4-azafluorene takes place from the M+ and [M — H]+ ion, exclusively from the [M — H]+ ion for the methyl-substituted compounds, and from the [M — H]+ and [H — 2H]+ fragments for the phenyl-substituted derivatives. Randomization of the deuterium ions in the 9,9-d2-4-azafluorene molecular ion was observed.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 246–250, February, 1978. 相似文献
3.
N. S. Prostakov V. G. Pleshakov T. Kholdarova V. P. Zvolinskii L. N. Plaksii 《Chemistry of Heterocyclic Compounds》1972,8(10):1264-1267
9-Methylnaphtho[2,1-b][1,6]naphthyrldine and 2,3-dimethyl-1-azaphenanthrene were obtained on a K-16 dehydrogenating catalyst from N-(1,2,5-trimethyl-4-piperidylidene)--naphthylamine, while N-cyclohexylidene--naphthylamine yielded N-phenyl--naphthylamine and benzo[a]carbazole.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1400–1403, October, 1972. 相似文献
4.
V. G. Pleshakov V. M. Akimov E. Huipe Nava S. V. Lindeman Yu. T. Struchkov K. D. Ambacheu A. G. Dudareva M. A. Ryashentseva V. P. Zvolinsky N. S. Prostakov 《Russian Chemical Bulletin》1995,44(4):682-688
Based on thermogravimetric characteristics first obtained for the model 6H-indeno [1,2-b]quinoline, the scheme of thermal conversions of this compound in the temperature range 20–700 °C has been proposed, and the limit of its thermal stability (300 °C) has been determined. This temperature is recommended as the optimum for synthesizing fused benzoaza(diaza)fluorenes. Based on the results of X-ray structural analysis, the molecules of the studied indenoquinoline form centrosymmetric pairs, which are arranged in (110) layers. The molecules are orientationally disordered. The observed self-association of these molecules is similar to the - association of fused heterocyclic systems with-excessive and
****- deficient fragments. It has been suggested that interferon-inducing and antitumor compounds with an annelated indenyl fragment have a common mechanism of action according to the intercalation model of stacking structures.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 703–709, April, 1995. 相似文献
5.
We consider a 2-periodic function f continuous on
and changing its sign at 2s points y
i [–, ). For this function, we prove the existence of a trigonometric polynomial T
n of degree n that changes its sign at the same points y
i and is such that the deviation |f(x) – T
n(x)| satisfies the second Jackson inequality. 相似文献
6.
N. S. Prostakov V. G. Pleshakov V. P. Zvolinskii 《Chemistry of Heterocyclic Compounds》1968,4(6):767-771
Derivatives of 1-hydroxy-2,5-dimethylpiperid-4-one substituted at the hydroxy and the carbonyl groups have now been prepared and the IR spectra of some of them have been studied. 1-Nitroso-2,5-dimethylpiperid-4-one has been prepared from 2,5-dimethylpiperid-4-one and subjected to various reactions at the nitroso- and the carbonyl groups. The IR spectra of the N-nitroso-compounds prepared are discussed. 相似文献
7.
N. S. Prostakov T. Kholdarova V. G. Pleshakov S. Ya. Govor V. P. Shalimov 《Chemistry of Heterocyclic Compounds》1973,9(3):323-326
The Favorskii reaction with 1,2,5-trimethyl-4-piperidone and ethyl- and naphthylacetylenes gave the corresponding piperidols, the hydrogenation of which gave 1,2,5-trimethyl-4-nbutyl(or 2-naphthylethyl)-4-piperidols. 4-Phenyl- and 4-butyl-2,5-dimethylpyridine were condensed with formaldehyde, and some of the transformations of the resulting-hydroxyethyl derivatives were studied.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 349–352, March, 1973. 相似文献
8.
N. S. Prostakov N. N. Mikheeva V. G. Pleshakov 《Chemistry of Heterocyclic Compounds》1972,5(6):755-758
The synthesis of noncondensed dipiperidylbenzene and tripiperidyl systems has been effected. Some derivatives of compounds of this series have been obtained. 相似文献
9.
10.
V. F. Pleshakov 《Crystallography Reports》2008,53(4):545-549
It is established that the surface of a monochromator for a point X-ray source in diffractometers is the surface of revolution of a circle arc around the straight line connecting the X-ray source and detector. It is shown that scattering occurs at the points of intersection of the monochromator surface with the set of ellipsoids of revolution, in whose focuses the X-ray source and detector are located. A formula is obtained for calculating the misorientation angle of mosaic blocks. The limits of variation in the angle for Fe \(K_{\alpha _1 } \), Cu \(K_{\alpha _1 } \), and Mo \(K_{\alpha _1 } \) radiations are determined. It is shown that there is no unified continuous reflecting monochromator surface, and the true reflecting surface is fractal. 相似文献