70 Result(s)

Article

Synthesis and study of azide-tetrazole tautomerism in 2-azido-6-phenylpyrimidin-4(3H)-one and 2-azido-4-chloro-6-phenylpyrimidine

Azide-tetrazole equilibrium in 2-azido-6-phenylpyrimidin-4(3H)-one and 2-azido-4-chloro-6-phenylpyrimidine was studied by IR spectroscopy and ¹H and ¹³C NMR spectroscopy in a comparison with the published data. F...

N. V. Aleksandrova, E. B. Nikolaenkova, Yu. V. Gatilov… in Russian Chemical Bulletin (2022)

Article

Synthesis and study of the azide-tetrazole tautomerism in 2-azido-4-(trifluoromethyl)-6-R-pyrimidines (R = H, 4-ClC₆H₄)

Azide-tetrazole equilibrium in azidopyrimidines bearing trifluoromethyl group on the example of 2-azidopyrimidines has been studied. The latter were synthesized via nitrosation of 2-hydrazino-4-trifluoromethylpyr...

Е. B. Nikolaenkova, N. V. Aleksandrova, V. I. Mamatyuk… in Russian Chemical Bulletin (2018)

Article

2,6-Disubstituted 4-azidopyrimidines: synthesis, kinetic and thermodynamic studies of azide-tetrazole rearrangement by NMR spectroscopy

Thermodynamic and kinetic parameters of the tautomeric tetrazole-azide rearrangement for a series of 2,6-disubstituted 4-azidopyrimidines are determined by NOESY/EXSY and DNMR: ΔH = 15—28 kJ mol^–1; ΔS = 47—65 J m...

N. V. Pleshkova, E. B. Nikolaenkova, V. P. Krivopalov… in Russian Chemical Bulletin (2017)

Article

Synthesis of new combretastatin A-4 analogues and study of their anti-inflammatory activity

A new approach to the synthesis of natural combretastatin A-4 analogues based on the interaction of α-acetylenic ketones with secondary amines (diethyl amine, pyrrolidine, piperidine, morpholine) was proposed....

M. P. Davydova, I. V. Sorokina, T. G. Tolstikova… in Russian Journal of Bioorganic Chemistry (2015)

Article

Base-catalyzed heterocyclization of 2-(R-ethynyl)benzohydroxamic acids

Sonogashira alkynylation of methyl 2-iodobenzoate with terminal acetylenes gave a series of methyl 2-(alk-1-yn-1-yl)benzoates which reacted with hydroxylamine in boiling methanol to produce five- or six-membered

S. F. Vasilevskii, T. F. Mikhailovskaya… in Russian Journal of Organic Chemistry (2014)

Article

Physicochemical properties of culms in rye (Secale cereale L.) with a brittle stem

In carrying out a genetic analysis of rye in terms of a “brittle stem” trait, sister plants with normal and brittle stems were obtained. The culms of plants were studied in terms of chemical composition, spect...

A. A. Konovalov, I. K. Shundrina… in Russian Journal of Genetics: Applied Resea… (2013)

Article

Non-empirical and DFT calculations of ¹⁹F and ¹³C chemical shifts in the NMR spectra of substituted pentafluorobenzenes

Chemical shifts in ¹⁹F and ¹³C NMR spectra of substituted pentafluorobenzenes are calculated by Hartree-Fock and density functional theory methods. The calculated values are compared with the experimental data kn...

D. S. Fadeev, I. P. Chuikov, V. I. Mamatyuk in Journal of Structural Chemistry (2013)

Article

Study on the strength of straw in rye (Secale cereale L.) with the use of the method of the dynamic mechanical analysis

Five indices of the straw strength (elastic module, elastic limit, elastic deformation, ultimate strength, ultimate deformation) have been found for the third and the fourth internodes in mutant (vitreous culm...

A. A. Konovalov, I. K. Shundrina, V. I. Mamatyuk… in Russian Agricultural Sciences (2013)

Article

Reaction of 4-aryl-2-methylbut-3-yn-2-ols with thiourea as a new approach to the synthesis of 4-arylmethylidene-5,5-dimethyl-4,5-dihydrothiazole-2-amines

A reaction of thiourea with 4-aryl-2-methylbut-3-yn-2-ols in refluxing pyridine led to the synthesis of 4-arylmethylidene-5,5-dimethyl-4,5-dihydrothiazole-2-amines.

D. S. Baranov, V. I. Mamatyuk, Yu. V. Gatilov… in Russian Chemical Bulletin (2012)

Article

γ-hydroxypropylation of 2,6-dialkyl(aryl)phenols with allyl alcohol and its derivatives

The composition of the products of the reaction of 2,6-disubstituted phenols with allyl alcohol and its derivatives in an alkaline medium was investigated, the conditions for carrying out the reaction with the...

A. P. Krysin, N. U. Khalikova, T. B. Khlebnikova… in Russian Journal of General Chemistry (2010)

Article

Syntesis of 2- and 3-chloro-1,4-dihydroxythioxanthen-9-ones

1,4-dihydroxythioxanthen-9-one was for the first time subjected to regioselective chlorination into 2-chloro-1,4-dihydroxythioxanthen-9-one effected by SOCl₂ at room temperature. The hydrochlorination of thioxant...

V. A. Loskutov, V. I. Mamatyuk, I. V. Beregovaya in Russian Journal of Organic Chemistry (2010)

Article

Stereochemical nonrigidity of homophenalenyl cations

A strong temperature dependence was observed of chemical shifts in the ¹³C NMR spectra of 3b,4-exo-4a,5-tetramethyl-3b,4,4a,5-tetrahydro-4H-cyclopropa[a]phenalen-5-yl cation and its endo-epimer revealing their st...

G. E. Sal’nikov, A. M. Genaev, V. I. Mamatyuk… in Russian Journal of Organic Chemistry (2008)

Article

Homophenalenyl cations, new representatives of homoaromatic systems

3b,4-exo,4a,5-Tetramethyl-3b,4,4a,5-tetrahydro-4H-cyclopropa[a]phenalen-5-yl cation and its endo-epimer were proved by NMR method to belong to a new kind of homoaromatic systems: homophenalenyl carbocations.

G. E. Sal’nikov, A. M. Genaev, V. I. Mamatyuk… in Russian Journal of Organic Chemistry (2008)

Article

Chlorination of 1,4-dihydroxythioxanthen-9-one

V. A. Loskutov, Yu. V. Gatilov, V. I. Mamatyuk in Russian Journal of Organic Chemistry (2008)

Article

Reactions of Z-isomers of alkylaromatic 1,2-hydroxylamino oximes with methyl-and arylglyoxals

Reactions of the Z-isomers of alkylaromatic 1,2-hydroxylamino oximes (that contain the hydroxylamino group at the primary or secondary carbon atom) with methylglyoxal gave 6-acetyl-5,6-dihydro-4H-1,2,5-oxadiazine...

S. A. Amitina, I. A. Grigor’ev, V. I. Mamatyuk… in Russian Chemical Bulletin (2007)

Article

Reductive activation of arenes

Stable cyanomethylcyclohexadienyl anions generated in two-electron reduction of isomeric tolunitriles by potassium in liquid ammonia were detected by NMR spectroscopy. The chemical shifts in these anions were ...

T. A. Vaganova, P. S. Yuferov, L. I. Goryunov… in Russian Chemical Bulletin (2006)

Article

Formation of 3-Methyl-1-adamantyl Trifluoromethanesulfonate in the Reaction of 3,7-Dimethylenebicyclo[3.3.1]nonane with Trifluoromethanesulfonic Acid. Dissociation and Carbocationic Rearrangements

According to the ¹H NMR data, the reaction of equimolar amounts of 3,7-dimethylenebicyclo[3.3.1]nonane with trifluoromethanesulfonic acid in CD₂Cl₂ leads to formation of 3-methyl-1-adamantyl trifluoromethanesulfo...

A. M. Genaev, V. A. Sokolenko, G. E. Sal'nikov… in Russian Journal of Organic Chemistry (2002)

Article

Derivatives of L-Pimaric Acid in the Synthesis of Chiral Organophosphorus Ligands from Decahydrophenanthrene Series

Starting with maleopimaric and fumaropimaric acids were prepared chiral organophosphorus ligands from decahydrophenanthrene series. Cationic complexes of Rh(I) prepared therefrom were tested for catalysts of a...

A. G. Tolstikov, N. N. Karpyshev, O. V. Tolstikova… in Russian Journal of Organic Chemistry (2001)

Article

The structure and properties of 3-(triphenylphosphoranylidene)naphthalene-1,2,4(3H)-trione

The structure of 3-(triphenylphosphoranylidene)naphthalene-1,2,4(3H)-trione was established with the use of IR and¹³C NMR spectroscopy and quantum-chemical calculations. Reactions of this compound with NH₂OH and ...

V. A. Loskutov, V. I. Mamatyuk, I. V. Beregovaya in Russian Chemical Bulletin (1999)

Article

Regio- and stereoselective ring opening in the reactions of ethyl 2-aryl-4-azidopyrimidine-5-carboxylates with ethyl cyanoacetate: Formation of highly polarized bis(en)amines

E. B. Nikolaenkova, V. I. Mamatyuk, V. P. Krivopalov in Russian Chemical Bulletin (1998)