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  1. No Access

    Article

    Influence of nonlinear interactions on the development of instability in hydrodynamic wave systems

    The problem of the development of shear instability in a three-layer medium simulating the flow of a stratified incompressible fluid is considered. The hydrodynamic equations are solved by expanding the Hamilt...

    N. N. Romanova, O. G. Chkhetiani… in Journal of Experimental and Theoretical Ph… (2016)

  2. No Access

    Article

    Synthesis of Schiff bases from 3-amino-3-arylpropionic acid esters in aqueous medium

    N. N. Romanova, I. I. Rybalko, T. G. Tallo… in Russian Journal of Organic Chemistry (2012)

  3. No Access

    Article

    Biologically active cyclic polypeptides with fragments of β-amino acid derivatives isolated from marine organisms (review)

    Published data on the structure, stereochemistry, and biological activity of natural cyclic polypeptides containing fragments of β-amino acids are reviewed, and an attempt is made to relate the structure to th...

    N. N. Romanova, T. G. Tallo, I. I. Rybalko… in Chemistry of Heterocyclic Compounds (2011)

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    Article

    Stabilization of a linearly unstable wave participating in a three-wave resonant interaction

    An analytical study of the influence of three-wave resonant interactions on the evolution of unstable wave disturbances is presented in the Kelvin-Helmholtz model. These results may be of interest in analyzing...

    N. N. Romanova, I. G. Yakushkin in Izvestiya, Atmospheric and Oceanic Physics (2010)

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    Article

    Resonant interaction of waves of continuous and discrete spectra in the simplest model of a stratified shear flow

    The equations of dynamics of eddy—wave disturbances of two-dimensional stratified flows in an ideal incompressible fluid that are written in a Hamiltonian form are used to study the resonant interaction of wav...

    N. N. Romanova in Izvestiya, Atmospheric and Oceanic Physics (2008)

  6. No Access

    Article

    Hamiltonian description of shear and gravity shear waves in an ideal incompressible fluid

    Methods of studying the dynamics of wave disturbances in st;ratified shear flows of an ideal incompressible fluid are considered. The equations governing the motions of interest represent Hamilton equations an...

    N. N. Romanova, I. G. Yakushkin in Izvestiya, Atmospheric and Oceanic Physics (2007)

  7. No Access

    Article

    Three-wave resonant interaction involving unstable wave packets

    S. Yu. Annenkov, N. N. Romanova in Doklady Physics (2003)

  8. No Access

    Article

    Effect of Microwave Irradiation on the Direction and Stereochemistry of Rodionov and Michael Reactions

    The reactions of 2-phenylpropanal with ethyl hydrogen malonate and benzylamine (or benzylammonium acetate) and of ethyl 4-phenyl-2-pentenoate with benzylamine take different pathways, depending on the conditions.

    N. N. Romanova, A. G. Gravis, P. V. Kudan… in Russian Journal of Organic Chemistry (2003)

  9. No Access

    Article

    Hamiltonian description of motion in a perfect stratified fluid

    N. N. Romanova, I. G. Yakushkin in Doklady Physics (2001)

  10. No Access

    Article

    The Use of Microwave Activation in the Chemistry of Heterocyclic Compounds. (Review)

    Published data on the successful application of microwave activation in the chemistry of various heterocycles over the last two years are discussed.

    N. N. Romanova, P. V. Kudan, A. G. Gravis… in Chemistry of Heterocyclic Compounds (2000)

  11. No Access

    Article

    Synthesis and stereochemistry of chiral 2-azetidinones and 2-azetidinethiones. 2.* Study of the chiroptical properties of some 2-azetidinones

    Circular dichroism (CD) spectra were taken for 13 2-azetidinones with one, two, and three asymmetric sites. A possible correlation was found between the sign of the Cotton effect (CE) of the n-π* transition of...

    V. V. Dunina, N. N. Romanova in Chemistry of Heterocyclic Compounds (1995)

  12. No Access

    Article

    Synthesis and stereochemistry of chiral azetidin-2-ones and azetidine-2-thiones. 3. Stereodirected construction of theβ-lactam fragment of the thienamycin molecule

    It has been shown possible to introduce an α-hydroxyethyl group trans-stereospecifically into position 3′ of 4-methyl-1-(α-methyl-benzl)azetidin-2-one. The stereochemistry of the asymmetric centers C(3′), C(3), a...

    N. N. Romanova, T. G. Tallo, Yu. G. Bundel in Chemistry of Heterocyclic Compounds (1995)

  13. No Access

    Article

    Stereochemistry of electrophilic substitution in β-lactam systems (review)

    The literature data on the synthesis of 3-monosubstituted and 3,3-disubstituted β-lactams on the basis of reactions of lithium derivatives of 2-azetidinones with electrophiles are systematized.

    N. N. Romanova in Chemistry of Heterocyclic Compounds (1990)

  14. No Access

    Article

    Stereochemistry of the methylation of the (11S,4S) and (11S,4R) diastereomers of 4-methyl-1-(α-methylbenzyl)azetidin-2-one

    The methylation of the lithium derivatives of the (11S,4S) and (11S,4R) diastereomers of 4-methyl-1-(α-methylbenzyl)azetidin-2-one proceeds stereospecifically with the formation of only trans-(3S,4S)- and trans-(...

    N. N. Romanova, T. G. Tallo, A. A. Borisenko… in Chemistry of Heterocyclic Compounds (1990)

  15. No Access

    Article

    β-Lactams: Relationship of structure and stereochemistry to biological activity

    N. N. Romanova in Pharmaceutical Chemistry Journal (1990)

  16. No Access

    Article

    Asymmetrical alkylation of 1-[(s)-α-phenylethyl]-azethidinone-2

    The methylation of the lithium derivative of azethidinone-2 which has a chiral substituent at the nitrogen atom is asymmetrical and leads, with an optical yield of 35%, to diastereomeric 3-methylated azethidin...

    N. N. Romanova, V. A. Budylin, G. V. Grishina… in Chemistry of Heterocyclic Compounds (1986)

  17. No Access

    Article

    Synthesis of benzo(aminomethyl)indoles

    The benzene ring in indoles has been aminomethylated in high yield by reaction with methylolphthalimide followed by hydrazinolysis of the phthalimidomethyl derivatives. In the hydrazinolysis of one of the phth...

    A. Muminov, L. G. Yudin, E. Ya. Zinchenko… in Chemistry of Heterocyclic Compounds (1985)

  18. No Access

    Article

    Asymmetric methylation of 1-[(S)-α-phenylethyl]-2-azetidinone

    N. N. Romanova, V. A. Budylin, G. V. Grishina… in Chemistry of Heterocyclic Compounds (1985)

  19. No Access

    Article

    Synthesis of 1-(α-phenylethyl)azetidin-2-ones

    Phase-transfer catalyzed cyclization of racemic and optically active N-substituted β-aminoacids has given racemic and optically active 2-azetidinones, the spatial structures of which have been established by N...

    N. N. Romanova, V. A. Budylin, G. V. Grishina… in Chemistry of Heterocyclic Compounds (1984)

  20. No Access

    Article

    Preparation of opticaly active 3-(1-methyl-1-phenylpropyl)indole and investigation of its chiral-optical properties

    Optically active 3-(1-methyl-1-phenylpropyl)indole was obtained by dehydrogenation of the resolved [by means of (L)-10-camphorsulfonic acid] 3-(1-methyl-1-phenylpropyl)indoline. The chiral-optical properties o...

    A. N. Kost, N. N. Romanova, V. A. Budylin… in Chemistry of Heterocyclic Compounds (1983)

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