Search results for: M. A. Galkina

Items from 1 to 10 out of 10 results

article

The dynamics of clonal dispersal and regenerative activity of Veronica filiformis J.E. Smith

Yu. K. Vinogradova, A. G. Kuklina, M. A. Galkina

Russian Journal of Biological Invasions > 2017 > 8 > 3 > 197-205

The absence of capacity for sexual reproduction does not hinder the rapid expansion of the invasive range of the alien species Veronica filiformis J.E. Smith (Plantaginaceae). Lawn mowing or raking causes the fragmentation of shoots and accelerates vegetative reproduction of V. filiformis. The clone diameter of this species was shown to increase up to 25 times during the growing season, whereas the...

article

Hybridization of alien and aboriginal taxons of Bidens L. genus in Eastern Europe

M. A. Galkina, Yu. K. Vinogradova

Biology Bulletin > 2017 > 44 > 4 > 406-411

Earlier it was suggested, based on study of the morphological features, that a new taxon of burmarigold, which had been noted in recent decades in several locations on the territory of Russia and neighboring countries and described as an alien species of Bidens connata, is in fact a hybrid species that arose in Europe. This hypothesis was confirmed by the molecular genetic method. A complex of taxa...

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Aza-Michael reaction as an efficient method for the synthesis of first representatives of β-azahetaryl-β-diphenylphosphorylalkanones

M. A. Galkina, G. V. Bodrin, E. I. Goryunov, I. B. Goryunova, more

Russian Chemical Bulletin > 2016 > 65 > 7 > 1855-1858

Aza-Michael reaction of (E)-4-(diphenylphosphoryl)but-3-en-2-one (1) with a number of mono-and bicyclic nitrogen heterocycles proceeds regioselectively in the absence of catalysts with the formation of corresponding β-azahetaryl β-diphenylphosphoryl ketones; in the case of imidazole, the presence of chiral organic catalysts allows one to increase the yields of the adducts and to obtain them in enantiomerically...

article

Biomorphological features and microevolution of the invasive species Bidens L. in European Russia

M. A. Galkina, Yu. K. Vinogradova, I. A. Shanzer

Biology Bulletin > 2015 > 42 > 4 > 315-325

Species of the genus Bidens that have invaded natural communities in Europe were observed. Fourteen species have been introduced in European botanical gardens since the 18th century, but only two of them have become invasive in Russia—Bidens frondosa and B. connata. B. frondosa demonstrates microevolutional ability in the second distribution range. Nevertheless, it has a low ability of hybridization...

article

Variability of the taxa of the Bidens L. Genera and the problem of hybridization

Yu. K. Vinogradova, M. A. Galkina, S. R. Mayorov

Russian Journal of Biological Invasions > 2014 > 5 > 1 > 1-11

The complex of microspecies of the Bidens genus referred earlier to B. × garumnae is characterized. Generation F₁ does not inherit the prostrate habit and entire leaves, which are specific to parental plants, but each sample is uniform and has its own set of morphological and biological characteristics. In the studied locality, only one B. radiata × B. frondosa hybrid grows. No proof of the hybrid...

article

Crystallization and quality examination of pharmaceutical substance venlafaxine

M. A. Galkina, O. M. Galkin, K. A. Kochetkov

Pharmaceutical Chemistry Journal > 2012 > 46 > 1 > 60-63

Crystallization of pharmaceutical substance venlafaxine was studied. The purity of the recrystallized product was established by elemental analysis, differential scanning calorimetry (DSC), HPLC, and IR and NMR spectroscopy.

article

Reactions of distabilized β-dicarbonyl sulfonium and iodonium ylides with isocyanates

Yu. G. Gololobov, I. R. Golding, M. A. Galkina, B. V. Lokshin, more

Russian Chemical Bulletin > 2006 > 55 > 5 > 883-891

The reactions of tosyl isocyanate with diethyl diphenylsulfuranylidenemalonate, 2-dimethylsulfuranylidenedimedone, and 2-dimethylsulfuranylideneindane-1,3-dione afforded 1,3-ditosyl-5,5-diethoxycarbonylimidazolidine-2,4-dione and tosylimination products at the keto groups, respectively. Phenyliodonium ylides derived from diethyl malonate and ethyl acetate react with 3,4-dichlorophenyl isocyanate to...

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Reactions of isocyanates with compounds containing active methylene groups in the presence of triethylamine

Yu. G. Gololobov, O. A. Linchenko, I. R. Golding, M. A. Galkina, more

Russian Chemical Bulletin > 2005 > 54 > 10 > 2398-2405

Compounds containing active methylene groups react with isocyanates of different structures in the presence of triethylamine to form functionally substituted amides.

article

Intramolecular electrophilic rearrangements in saturated acyclic systems. Reactivity of the zwitterion derived from triisopropylphosphine and ethyl 2-cyanoacrylate with respect to different types of electrophiles

Yu. G. Gololobov, M. A. Galkina, O. V. Dovgan, I. Yu. Krasnova, more

Russian Chemical Bulletin > 2001 > 50 > 2 > 279-286

The reactions of the zwitterion derived from triisopropylphosphine and ethyl 2-cyanoacrylate with mercuric chloride and aryl isothiocyanates containing Cl atoms in the ortho positions of the benzene ring follow an unusual pathway because this zwitterion represents “latent” triisopropylphosphine due to the reversibility of the reaction of triisopropylphosphine with ethyl 2-cyanoacrylate. The molecular...

article

Intramolecular Electrophilic Rearrangements in Saturated Acyclic Systems. Cρarr;N Migrations of Acetyl Group

Yu. G. Gololobov, M. A. Galkina, O. V. Dovgan', I. Yu. Krasnova, more

Russian Journal of Organic Chemistry > 2001 > 37 > 8 > 1061-1067

Reactions between isocyanates, carbanions with an acetyl group at the carbanion center occurvia rearrangement of the intermediate N-anions into isomeric C-anions by C→N-migration of the MeC(O)group. The acetyl group undergoes migration easier than the ethoxycarbonyl group. The P-zwitterionic rearrangement products were subjected to X-ray diffraction analysis.

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