Zobrazeno 1 - 10
of 201
pro vyhledávání: '"K. I. Pashkevich"'
Autor:
I. E. Filatov, Vladimir A. Tartakovsky, Yu. A. Strelenko, Sema L. Ioffe, K. I. Pashkevich, Aleksandr M. Churakov, V. S. Kuz'min, G. L. Rusinov
Publikováno v:
Russian Chemical Bulletin. 53:2577-2583
Treatment of 2- and 4-amino-3-(tert-butyl-NNO-azoxy)pyridines with nitrating agents (N2O5or NO2BF4) afforded the first representatives of pyridoannelated 1,2,3,4-tetrazine di-N-oxides, viz., pyrido[2,3-e][1,2,3,4]tetrazine 1,3-dioxide (9), 7-nitropyr
Publikováno v:
Journal of Fluorine Chemistry. 123:267-272
Symmetrical and unsymmetrical bis-fluoroacylcyclopentanones and cyclohexanones were synthesized. NMR data reveal that the keto–enol tautomeric equilibrium is changed markedly by the presence of a trimethylene bridge compared to an ethylene moiety.
Publikováno v:
Russian Journal of General Chemistry. 73:141-144
The tautomeric equilibrium in substituted 5,6,7,8-tetrahydroquinazolines was studied by IR spectroscopy. The effect of various substitutents in the pyrimidine ring and the solvent on the state of the tautomeric equilibrium was evaluated.
Publikováno v:
Journal of Analytical Chemistry. 57:326-330
A procedure was developed for determining chloroacetic acids in drinking water. The procedure is based on solid-phase extraction followed by the conversion of chloroacetic acids to trifluoroacetic esters and their separation and determination by gas
Publikováno v:
Journal of Analytical Chemistry. 55:221-226
A method for the metrological certification of reference samples (RS) of solutions of organic compounds was proposed. The method is based on a procedure of sample preparation that uses both calculated and experimental data and involves the evaluation
Publikováno v:
Journal of Analytical Chemistry. 55:227-230
A procedure was proposed for the metrological certification of reference samples (RS) of solutions of organic compounds. The procedure consists in the determination of performance characteristics of RSs using the developed and certified procedures fo
Publikováno v:
Russian Chemical Bulletin. 48:557-560
Reactions of 2-polyfluoroacylcyclohexanones with 1,2-diaminoarenes yield, depending on the reaction conditions, various 2-polyfluoroalkyl-substituted benzimidazoles.
Publikováno v:
Russian Chemical Bulletin. 46:1116-1119
Perfluorocarboxylic thioesters RFC(O)SR (RF=CF3(CF2)j, R=CH3(CH2)i, i andj=0–5) were studied for the first time by GLC on packed columns using SE-30, SKTFT-50X, and XE-60 as the stationary phase. The values of thermodynamics functions of sorption w
Publikováno v:
Russian Chemical Bulletin. 45:2163-2168
The composition of products of the interaction of asymmetric fluoroalkyl-containing β-diketones with amines was studied. Mixtures of regioisomeric β-aminovinylketones and products of cleavage and secondary condensation are formed, depending on the
Publikováno v:
Russian Chemical Bulletin. 43:812-815
The dependence of the variations in the differential molar free energy of sorption of polyfluorocarboxamides RFC(O)NR2 (RF = CF3(CF2)i,i=0 to 5, R=H or Me) on capillary columns on the molecular structure of the amides, the temperature of analysis, an