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  1. No Access

    Article

    Synthesis of 3-Chloro-3-(trimethylsilyl)prop-2-enoic Acid Amides and Hydrazides from 3-(Trimethylsilyl)propynoic Acid

    A number of previously unknown and difficultly accessible polyfunctional β-chloro-β-(trimethyl­silyl)prop-2-enoic acid amides and hydrazides have been synthesized by amination of 3-chloro-3-(trimethy...

    M. V. Andreev, M. M. Demina, A. S. Medvedeva… in Russian Journal of Organic Chemistry (2021)

  2. No Access

    Article

    One-pot three-component green synthesis of [1H-(1,2,3-triazol-5-yl)methylidene] heterocycles based on element-substituted propynals

    The one-pot three-component synthesis of polyfunctional bis-heterocyclic triazoles, namely, previously unknown 1H-1,2,3-triazolylmethylidenepyrimidines and -1,3-dioxanes, was performed for the first time in moder...

    M. M. Demina, A. S. Medvedeva, T. L. H. Nguyen, T. D. Vu… in Russian Chemical Bulletin (2017)

  3. No Access

    Article

    Synthesis of 4-Trialkylsilyl(Germyl)-1H-1,2,3-Triazolecarbaldehyde Oximes*

    Methods for the synthesis of 4-trialkylsilyl(germyl)-1H-1,2,3-triazole-5-carbaldehyde oximes have been developed. Microwave activation was shown to be highly efficient in the oximation of 1H-1,2,3-triazole-5-c...

    A. S. Medvedeva, M. M. Demina, T. V. Konkova… in Chemistry of Heterocyclic Compounds (2014)

  4. No Access

    Article

    Decisive role of water in efficient noncatalyzed synthesis of polyfunctional 1H-1,2,3-triazoles proceeding from γ-hydroxypropynals

    A highly efficient method was developed for the synthesis of new polyfunctional 1H-1,2,3-triazoles by the reaction of γ-hydroxypropynals with trimethylsilyl azide in water at room temperature without catalyst. Th...

    A. S. Medvedeva, M. M. Demina, T. L. H. Nguyen… in Russian Journal of Organic Chemistry (2013)

  5. No Access

    Article

    Highly efficient synthesis of 4-trialkylsilyl(germyl)-1H-1,2,3-triazole-5-carbaldehydes

    M. M. Demina, T. L. H. Nguyen, N. S. Shaglaeva… in Russian Journal of Organic Chemistry (2012)

  6. No Access

    Article

    1H nmr study on substituent effect in hetroelement-containing propynals on the Host–guest complexation with β-cyclodextrin

    A. S. Medvedeva, I. V. Mitroshina, A. V. Afonin… in Russian Journal of Organic Chemistry (2010)

  7. No Access

    Article

    Silyl- and germylpropynals in the synthesis of azolyl-substituted 2-imidazoline 3-oxide 1-oxyls

    Azolyl-substituted nitronylnitroxyls were synthesized using Me 3Si- and Et 3Ge-substituted propynals. When synthesizing 2-[3-(triethylgermyl)-l H-pyrazol-4-yl]-4,4,5,5-tetramethyl-4,5-dihydro-1 H-imidazole 3-oxid...

    E. V. Tretyakov, A. V. Mareev, M. M. Demina, G. V. Romanenko… in Russian Chemical Bulletin (2009)

  8. No Access

    Article

    Silicon- and germanium-substituted propynals as ambident electrophiles for the design of new heterocycles and polyfunctional acetylenes

    Research results on the reactivity of silicon- and germanium-substituted propynals as ambident electrophiles in the reactions with mono- and binucleophiles were summarized. Chemo- and regioselectivity of the n...

    A. S. Medvedeva, A. V. Mareev, M. M. Demina in Russian Chemical Bulletin (2008)

  9. No Access

    Article

    Stereospecificity of 13C shielding constants in the 13C NMR spectra of 3-substituted propynal oximes

    A. V. Afonin, M. M. Demina, T. V. Kon’kova… in Russian Journal of Organic Chemistry (2007)

  10. No Access

    Article

    Synthesis of 3-(2-azidoethyl)-1,5-dinitro-1,3,5-triazacycloheptane

    A. S. Medvedeva, L. P. Safronova, M. M. Demina in Russian Journal of Organic Chemistry (2007)

  11. No Access

    Article

    Reaction of 3-trimethylsilylprop-2-ynal with α-hydroxyamino oximes

    3-Trimethylsilylprop-2-ynal reacted with aliphatic α-hydroxyamino oximes in a chemoselective fashion at the aldehyde group to give hitherto unknown open-chain 3-trimethylsilylprop-2-yn-1-ylideneamine oxides. T...

    M. M. Demina, P. S. Novopashin, G. I. Sarapulova… in Russian Journal of Organic Chemistry (2007)

  12. No Access

    Article

    Interaction of heteroatom-containing propynals with S-, N-binucleophiles

    Reactions of α-silicon-and α-germanium-containing acetylenic aldehydes with 2-aminoethanethiol, ethylenediamine, and 2-amino-1,2,4-triazole proceed chemoselectively at the aldehyde group. The ratio of tautomer...

    M. M. Demina, P. S. Novopashin, T. V. Kon’kova… in Chemistry of Heterocyclic Compounds (2006)

  13. No Access

    Article

    1,3-dipolar cycloaddition of trimethylsilyl azide to propynals and dimerization of 1H-1,2,3-triazole-5-carbaldehydes to tricyclic bis-hemiaminals

    Reactions of trimethylsilyl azide with 3-trimethylsilyl-2-propynal and 2-propynal were studied. X-Ray analysis of the molecular structure of 4-trimethylsilyl-1H-1,2,3-triazole-5-carbaldehyde showed that the carbo...

    M. M. Demina, P. S. Novopashin, G. I. Sarapulova… in Russian Journal of Organic Chemistry (2004)

  14. No Access

    Article

    Synthesis of 5-Trimethylsilylethynyl-1,3,4-oxadiazoles

    5-Trimethylsilylethynyl-2-R-1,3,4-oxadiazoles were synthesized for the first time by intramolecular cyclocondensation of unsymmetrical N-acyl-N'-(3-trimethylsilyl-2-propynoyl)hydrazines by the action of phosphory...

    M. M. Demina, G. I. Sarapulova, A. I. Borisova… in Russian Journal of Organic Chemistry (2003)

  15. No Access

    Article

    Hydrosilylation of 2-(2-Propynyl)-2,3-dihydro-1,2-benzothiazol-3-one 1,1-Dioxide with 1-Alkynyl(dimethyl)- and Bis(1-alkynyl)methylsilanes

    Hydrosilylation of 2-(2-propynyl)-2,3-dihydro-1,2-benzothiazol-3-one 1,1-dioxide with 1-alkynyldimethyl- and bis(1-alkynyl)methylsilanes of the general formula Me n HSi(C=-CR)3-n

    G. S. Lyashenko, D. V. Dmitriev, I. A. Yazovtsev… in Russian Journal of Organic Chemistry (2003)

  16. No Access

    Article

    Synthesis of Unsymmetrical N-Acyl-N'-(3-trimethylsilylpropynoyl)hydrazines

    Previously unknown unsymmetrical N-acyl-N'-(3-trimethylsilylpropynoyl)hydrazines were synthesized by reactions of 3-trimethylsilylpropynoyl chloride with aroylhydrazines and 4-phenylsemicarbazide.

    M. M. Demina, G. I. Sarapulova, L. I. Larina… in Russian Journal of Organic Chemistry (2002)

  17. No Access

    Article

    α-Acetylene Hydrosilanes as Hydrosilylating Agents for Terminal Arylacetylenes

    The hydrosilylation of a number of acetylenes RC≡CH (R, R' = Ph, CH2OPh, CH2SPh) with α-ethynylhydrosilanes Me2SiHCH≡CR' in the presence of H2PtCl6 was investigated. The addition did not occur regioselectively, b...

    G. S. Lyashenko, A. S. Medvedeva, I. A. Yazovtsev… in Russian Journal of Organic Chemistry (2002)

  18. No Access

    Article

    Electronic effects of Me3SiOCR2 substituents in acetylene derivatives

    The σR0 and σp parameters of Me3SiOCR2 and HOCR2 substituents at the triple bond were determined using the IR spectra of individual acetylene derivatives and their H-complexes. These parameters vary as the effect...

    S. E. Skobeleva, T. G. Mushtina, A. N. Egorochkin… in Russian Chemical Bulletin (1998)

  19. No Access

    Article

    An unusual synthesis of 1,1,4,4-tetraarylbutatrienes

    A. S. Medvedeva, G. G. Chichkareva… in Bulletin of the Academy of Sciences of the… (1987)

  20. No Access

    Article

    Synthesis and pharmacological characteristics of some acetylenic diols

    A. S. Zaks, V. V. Yushkov, A. S. Medvedeva… in Pharmaceutical Chemistry Journal (1984)

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