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N. V. Shibaeva S. V. Borodaev I. A. Yudilevich A. P. Knyazev A. D. Dubonosov A. I. Pyshchev S. M. Luk'yanov 《Chemistry of Heterocyclic Compounds》1991,27(2):219-223
4-Alkyl-3-azapyrylium salts undergo acylation at the alkyl group under acid-catalyzed conditions to give 4-acylmethyl-3-azapyrylium derivatives, which upon heating in proton-donating solvents recyclize to give 4-acylaminopyrylium salts.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 265–269, February, 1991. 相似文献
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The reaction product of 2,6-diphenylpyrylium perchlorate with water in presence of bases, which earlier was assigned the structure of α,α',α″,α″-tetraphenyl-γ,γ'-dipyranyl ether, is identified now as 2,6-dipyranylidene-1, 5-diphenylpentenedione-1,5 from its chemical and spectral properties and by X-ray analysis.Crystals are monoclinic, space group P21/n with Z =4 in a unit cell of dimensions a =24.088, b= 9.323, c = 11.289 Å, β = 95.30°. The structure was solved by direct method and refined isotropically to R = 0.126 for 2423 reflections. 相似文献
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Ya. R. Tymyanskii S. M. Aldoshin M. I. Knyazhanskii O. A. D'yachenko A. I. Pyshchev L. O. Atovmyan 《Russian Chemical Bulletin》1982,31(3):478-482
Conclusions It was found by UV spectroscopy and x-ray diffraction analysis that the photocyclization of 1-(3'-halophenyl)-2,4,6-triphenylpyridiniurn cations leads to stable 1,3-diphenyl-11-chloro(bromo)-azoniatriphenylene cations.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 535–540, March, 1982. 相似文献
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É. A. Zvezdina A. N. Popova A. I. Pyshchev G. N. Dorofeenko 《Chemistry of Heterocyclic Compounds》1982,18(4):344-347
The reaction of 2,6-diphenylpyrylium perchlorate with methylamine and various anilines in acetic acid leads to pyridinium salts; 3,4-bispyridinium perchlorates were obtained in dimethylformamide. The reaction of 2,6-diphenylpyrylium perchlorate with hydrazine and the sodium salt of hydroxylamine leads to 3-phenyl-5-phenacyl-2-pyrazoline and -2-isoxazoline.See [1] for Communication 10.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 461–464, April, 1982. 相似文献
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E. V. Kuznetsov A. I. Pyshchev G. N. Dorofeenko 《Chemistry of Heterocyclic Compounds》1972,8(2):133-135
Substituted -pyrones were synthesized by the acylation of phenylacetaldehyde and its enol acetate with acetic and propionic anhydrides in the presence of 70% HClO4. The mechanism of the reaction is examined, and the IR and PMR spectra of the synthesized -pyrones are presented. Some of their transformations were studied.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 152–154, February, 1972. 相似文献
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N. V. Shibaeva I. I. Nechayuk S. V. Borodaev D. S. Yufit Yu. T. Struchkov A. I. Pyshchev S. M. Luk'yanov 《Chemistry of Heterocyclic Compounds》1991,27(11):1256-1261
Under the influence of DMF/Ac2O 2,4-diphenyl-6-methyl-3-azapyrylium perchlorates undergo condensation to give pyrido[1,2-c]pyrimidinium perchlorates. The structure of one of the perchlorates was proved by x-ray diffraction analysis.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1556–1561, November, 1991. 相似文献
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A method is proposed for the synthesis of unsymmetrical unsubstituted pyrylium salts by condensation of -chlorocinnamaldehydes with methyl and methylene ketones and -dicarbonyl compounds in the presence of HClO4 or Lewis acids. The probable scheme of the reaction is examined.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1031–1035, August, 1974. 相似文献
10.
M. S. Chernov'yants V. E. Gol'eva A. I. Pyshchev 《Journal of Analytical Chemistry》2003,58(2):139-143
The following biologically active diiodohalides of organic cations were studied: N-cetylpyridinium, trimethylbenzylammonium, triethylbenzylammonium, and N,N-dimethylmorpholinium diiodochlorides; N-cetylpyridinium, tetramethylammonium, tetrabutylammonium, and N,N-dimethylmorpholinium diiodobromides; and N,N-dimethylmorpholinium and butyroylcholinium triiodides. A simple and rapid procedure was proposed for the determination of the above compounds; it is based on the conversion of organic diiodohalides into the corresponding triiodides (300 nm 4 × 104; 370 nm 2 × 104) in the presence of excess potassium iodide (RSD 2%). An extraction–spectrophotometric method was developed for the quantitative determination of the biologically active compounds in pharmaceutical dosage forms based on their ion associates with anionic dyes, erythrosine (m
min = 1.25–3.30 g; RSD 3%) and Bromothymol Blue (m
min = 3.85 g; RSD = 3%), or a cationic dye—1,3-dimethyl-2-(4-morpholinophenyl)azobenzimidazolium phenylsulfate (m
min = 2.32–8.26 g; RSD 4%). The developed procedures were used for monitoring drug substances in model pharmaceutical preparations (RSD 4%). 相似文献