Search Results - (Author, Cooperation:V. Dorokhov)

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  1. 1
    Staff View
    Publication Date:
    2011-10-04
    Publisher:
    Nature Publishing Group (NPG)
    Print ISSN:
    0028-0836
    Electronic ISSN:
    1476-4687
    Topics:
    Biology
    Chemistry and Pharmacology
    Medicine
    Natural Sciences in General
    Physics
    Keywords:
    Antarctic Regions ; Arctic Regions ; Atmosphere/*chemistry ; Chlorine/chemistry ; *Environmental Monitoring ; History, 20th Century ; History, 21st Century ; Ozone/*analysis/chemistry/history ; Seasons ; Time Factors
    Published by:
    http://www.nature.com/

    Latest Papers from Table of Contents or Articles in Press
  2. 2
    Staff View
    ISSN:
    1090-6525
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Physics
    Notes:
    Abstract A compact multichannel mass analyzer is described, which enables one to analyze the composition of multicomponent ion beams.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1134/1.1259632

    Articles: DFG German National Licenses
  3. 3
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract A method is proposed for the synthesis of N-substituted 5-azaadenines. The condensation of N-(1,2,4-triazol-5-yl)amidines with trichloroacetonitrile gives trichloromethyl derivatives of 1,2,4-triazolo[1,5-a]-1,3,5-triazines, which are converted by the action of primary or secondary amines into N-alkylamino- or N,N-dialkylamino-1,2,4-triazolo-[1,5-a]-1,3,5-triazines (5-azaadenines).
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00959673

    Articles: DFG German National Licenses
  4. 4
    Staff View
    ISSN:
    1573-9171
    Keywords:
    acylaminopyridines ; trichloroacetonitrile ; boron chelates
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract New chelating ligands, N-(pyrid-2-yl)amides of 4,4,4-trichloro-3-amino-2-cyanocrotonic acid have been synthesized from N-(pyrid-2-yl)amides of cyanoacetic acid and CCl3CN. It has been demonstrated that by the action of butylthiodibutylborane they form binuclear boron chelate complexes. Analogous chelates have also been obtained from the N-(pyrid-2-yl)amides of acetoacetic and 4,4,4-trichloro-3-aminocrotonic acids.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01150906

    Articles: DFG German National Licenses
  5. 5
    Dorokhov, V. A. ; Dem'yanets, Z. K.
    Springer
    Published 1993
    Staff View
    ISSN:
    1573-9171
    Keywords:
    cyanamide ; β-ketocarboxylic esters ; Ni(acac)2 as catalyst ; acyl(alkoxy-carbonyl)ketene aminals ; N-unsubstituted
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract The interaction of cyanamide with β-ketocarboxylic esters in the presence of Ni(acac)2 affords N-unsubstituted aminals of acyl(alkoxycarbonyl)ketenes.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00697105

    Articles: DFG German National Licenses
  6. 6
    Staff View
    ISSN:
    1573-9171
    Keywords:
    boron chelate complexes ; acylaminopyridines ; tautomerism
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Mono- and binuclear boron chelates have been synthesized by the action of butylthiodibutylborane on the ethyl esters of 4-[N-(R-pyrid-2-yl)carbamoyl]-3-amino-2-cyanobuten-2-ic acids (codimers of N-(R-pyrid-2-yl) amides and the ethyl ester of cyanoacetic acid). Complexes of this type can exist in solution in the form of two tautomers: acetamide acid derivatives or the corresponding ketene N,O-acetals.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00863595

    Articles: DFG German National Licenses
  7. 7
    Staff View
    ISSN:
    1573-9171
    Keywords:
    hexaaminobenzene ; fused heterocyclic systems ; benzotris(triazole) ; benzo[1,2-d:4,5-d”]bis(triazole)-4,8-dione ; synthesis methods
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract New methods for synthesis of hexaaminobenzene are proposed and, based on this compound, previously unknown preparative procedures for obtaining fused benzotriazoles are developed.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00699995

    Articles: DFG German National Licenses
  8. 8
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00700023

    Articles: DFG German National Licenses
  9. 9
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00702025

    Articles: DFG German National Licenses
  10. 10
    Staff View
    ISSN:
    1573-9171
    Keywords:
    iphenylboron chelates, 3-acetyl(benzoyl)-4-amino-5,5,5-trifluoro-3-penten 2-one ; β-diiminates ; dimethylformamide dimethylacetal ; 3-acyl-4-amino(hydroxy)2-trifuoromethylpyridines ; chelate organic synthesis
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Schemes for synthesizing 3-acyl-4-amino(hydroxy)-2-trifluoromethylpyridines from 3-acyl 4-amino-5,5,5-trifluoro-3-penten-2-ones via their diphenylboron chelate complexes have been suggested.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF01431118

    Articles: DFG German National Licenses
  11. 11
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract A method was developed for preparation of alkyl-(2,2′-dipyridyl) amines, consisting of the reaction of alkyl halides with the N anion electrochemically generated from 2,2′-dipyridylamine. The alkylation occurs regiospecifically, and CH2Cl2 can also be used as the methylating agent. Complexes of alkyl-(2,2′-dipyridyl)-amines with Pd(2+) and Cu(2+) salts were obtained.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00959645

    Articles: DFG German National Licenses
  12. 12
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract 2,4-Diamino-5-acetyl(ethoxycarbonyl)-6-methyl(phenyl)pyrimidines were obtained by the reaction of acetylacetone and β-ketocarboxylic acid esters with dicyandiamide in the presence of Ni(OAc)2. It was shown that annelation of the pyrimidine ring with this compound provides a convenient method for building the pyrimido[4,5-d]-pyrimidine system. New derivatives of 2-aminopyrimido[4,5-d]pyrimidine, 7-amino-3H-pyrimido[4,5-d]-pyrimidin-4-one, and 7-amino-1H,3H-pyrimido[4,5-d]-pyrimidine-2,4-dione were synthesized.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00959646

    Articles: DFG German National Licenses
  13. 13
    Dorokhov, V. A. ; Baranin, S. V. ; Dib, A. ; Bogdanov, V. S.
    Springer
    Published 1991
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract The reaction of N-(pyrid-2-yl) and N-(5-methyipyrid-2-yl) cyanoacetamides with butylthiodibutylborane in a 2∶3 ratio leads to the formation of trinuclear complex boron compounds, the alcoholysis of which gave N,N′-di(pyrid-2-yl) 3-amino-2-cyanopent-2-ene-1,5-diamides. The latter are dimers of the starting cyanamides, which are capable of acting as hexadentate chelating agents.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00959648

    Articles: DFG German National Licenses
  14. 14
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Chelate complexes in which the boron atom is bound to the pyridine N atom and the O atom of the deprotonated ligand were synthesized by reaction of N-(pyrid-2-yl)- and N-(4-methylpyrid-2-yl) cyanoacetamides. A new type of intrachelate tautomeric transformation was discovered: the complexes obtained can exist in solutions in the form of two tautomers, which are derivatives of acetimidic acid or the corresponding ketene N,O-acetals.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00959647

    Articles: DFG German National Licenses
  15. 15
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract X-ray diffraction has been used to establish the crystalline and molecular structure of the intracomplex 2-[(dibutylboryloxy)(butyl)borylamino]4-methylpyridine. In the crystal, the molecule forms weak intermolecular N(H)...O hydrogen bonds. The bicyclic portion of the molecule is nearly planar. From the bond lengths in the ring, which incorporates boron atoms of differing hybridization (sp3 and sp2), it follows that delocalization of electron density extends only over the amidine fragment. Quantum chemical calculations (MO LCAO, version CNINDO/2) show that the electron density at the endocyclic nitrogen of the aminopyridine system coordinated with boron is lower than that at the endocyclic nitrogen of the aminopyridine.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00959649

    Articles: DFG German National Licenses
  16. 16
    Staff View
    ISSN:
    1573-9171
    Keywords:
    phenacyl thiocyanate ; β-dicarbonyl compounds ; keteneN, S-acetals ; nickel acetylacetonate ; 1,3-thiazoline derivatives ; boron chelates
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Acetylacetone and ethyl acetoacetate undergo addition at the C≡N bond of phenacyl thiocyanate in the presence of Ni(acac)2 to give the respective keteneN, S-acetals, which undergo smooth cyclization to afford 2-methylene-4-phenyl-1, 3-thiazoline derivatives when refluxed in THF.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00699002

    Articles: DFG German National Licenses
  17. 17
    Staff View
    ISSN:
    1573-9171
    Keywords:
    monoacylketene aminals ; benzoyl isothiocyanate ; heterocyclization ; pyrimidine-4-thiones ; pyrido[2,3-d]pyrimidine-5-ones ; dimethylformamide dimethylacetal
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract Monoacylketene aminals containing an unsubstituted NH2 group react as C-nucleophiles with benzoyl isothiocyanate to give the corresponding thioamides which undergo cyclization by sodium methoxide in methanol to afford 6-R-amino-5-acetyl-2-phenyl-3H-pyrimidine-4-thiones. A scheme for constructing the pyrido[2,3-d]pyrimidine system from keteneaminals is offered. The reaction of 6-R-amino-5-acetyl-2-phenyl-3H-pyrimidine-4-thiones with dimethylformamide dimethylacetal leads to 8-R-N-4-methylthio-8H-pyrido-[2,3-d]pyrimidine-5-ones. Cyclization of 5-acetyl-6-benzoylamino-4-methylthio-2-phenylpyrimidine by sodium methoxide yields N-unsubstituted 4-methylthio-8H-pyrido-[2,3-d]pyrimidine-5-one.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00699001

    Articles: DFG German National Licenses
  18. 18
    Staff View
    ISSN:
    1573-9171
    Keywords:
    X-ray crystallographic analysis ; s-triazolo-s-triazine ; 5-azapurine
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract The crystal and molecular structure of 7-phenyl-1,2,4-triazolo[1,5-a]-1,3,5-triazine were determined. It was shown that the amine nitrogen atom (N1) of the triazole ring acts as a nucleophilic center in the cyclization of N-(1,2,4-triazol-5-yl)amidines with electrophilic reagents.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00866591

    Articles: DFG German National Licenses
  19. 19
    Staff View
    ISSN:
    1573-9171
    Keywords:
    X-ray crystallographic analysis ; heterylamidine ; N-(1,2,4-triazol-5-yl)benzamidine ; N-(1,2,4-triazol-5-yl)benzamidine hydrochloride
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Notes:
    Abstract The crystal and molecular structures of N-(1,2,4-triazol-5-yl)benzamidine (1) and its hydrochloride (2) were determined by x-ray crystallography. In compound 1 both independent molecules are Z isomers of the anidine substituted in the imino group and 5-substituted 1H-1,2,4-triazoles. In the crystal the molecules of compound 1 are linked into a stable dimer by intermolecular hydrogen bonds. An undissociated HCl molecule was unexpectedly found in the structure of compound 2, while the structure of the base corresponded to the Z isomer of the amidine substituted in the amino group and to 2H-1,2,4-triazole substituted at position 5. The structures of compounds 1 and 2 are stabilized by an intramolecular hydrogen bond. The HCl molecule participates in the formation of intermolecular hydrogen bonds in compound 2.
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00866590

    Articles: DFG German National Licenses
  20. 20
    Dorokhov, V. A. ; Prezent, M. A.
    Springer
    Published 1992
    Staff View
    ISSN:
    1573-9171
    Source:
    Springer Online Journal Archives 1860-2000
    Topics:
    Chemistry and Pharmacology
    Type of Medium:
    Electronic Resource
    URL:
    http://dx.doi.org/10.1007/BF00866610

    Articles: DFG German National Licenses