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  • 1
    Electronic Resource
    Electronic Resource
    On the Reactivity of N,N-Bis(trimethyl)silylated Enamines: Model studies on hetero Diels-Alder reactions and other cycloadditions (1995)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 209-215 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In-situ generated nitroso alkenes underwent smooth hetero Diels-Alder reactions with E-1-[N,N-bis(trimethylsilyl)amino]-1-propene (1) and furnished 1,2-oxazines 7-9 in good yields. In contrast, the other n-disilylated enamines Z-1, 2, and 3 did not react with α nitrosostyrene. Thus, a very simple kinetic separation of E/Z-1 is possible. By addition of dichlorocarbene olefin E-1 could also be converted into the corresponding dichlorocyclopropane 14. The reactivity of 1 is compared to that of other electron-rich olefins, and it is discussed regarding NMR data, photoelectron spectra as well as AM1-calculations.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19953370145
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  • 2
    Electronic Resource
    Electronic Resource
    Photoelektronenspektren und Konformationen von Peroxiden und OzonidenHerrn Prof. Dr. W. Lüttke zum sechzigsten Geburtstag gewidmet. (1979)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1473-1482 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photoelectron Spectra and Conformations of Peroxides and OzonidesThe splitting Δε of the first two ionization potentials of peroxides can be related to the O - O-torsional angle ϕ by the equation Δε = 2.08 cos ϕ + 0.15 (eV) The photoelectron spectra of the acyclic or cyclic peroxides 1 - 10, of the 1,2,4,5-tetroxanes 12 and 13, and of the ozonides 14 - 16 have been interpreted with regard to gas phase conformations.
    Notes: Die Aufspaltung Δε der ersten beiden Ionisationspotentiale von Peroxiden läßt sich mit dem O  -  O-Torsionswinkel ϕ über die Beziehung Δε = 2.08 cos ϕ + 0.15 (eV) korrelieren. Die Photoelektronenspektren der acyclischen und cyclischen Peroxide 1 - 10, der 1,2,4,5-Tetroxane 12 und 13 sowie der Ozonide 14 - 16 wurden hinsichtlich der in der Gasphase vorliegenden Konformeren ausgewertet.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197919791005
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  • 3
    Electronic Resource
    Electronic Resource
    The lone-pair orbitals of triaziridine (1988)
    Chichester : Wiley-Blackwell
    Journal of Physical Organic Chemistry 1 (1988), S. 267-273 
    Details
    ISSN: 0894-3230
    Keywords: Organic Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The PE spectra of four stable bicyclic triaziridines with trifluoromethyl, methyl, phenyl, spirocyclopentane and spirocyclohexane substituents are measured. From a comparison of these experimental data with MNDO calculations the energies and the interactions of the nitrogen lone-pair orbitals were obtained. The trifluoromethyl group may be reliably simulated by a fluorine atom. The ionization potentials are unexpectedly high and so are the cyclovoltammetric anodic potentials. The MNDO valence electron densities are in agreement with the comparatively small differences in the chemical shifts of the differently substituted nitrogens of the triaziridine rings.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/poc.610010504
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis, spectral characteristics and structure of 1,3- and 1,4-disubstituted tetrazolinones (1995)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 337 (1995), S. 636-640 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of ethylene oxide with 1-alkyl- or 1-aryl-1,4-dihydrotetrazole-5-thiones in acetic acid affords the corresponding mesoionic 1-alkyl- or 1-aryl-3-(2-hydroxyethyl)-tetrazolium-5-olates 4-6. The X-ray structure of one of these compounds (5) is presented. On the other hand, the reaction of tetrazolinones with 2-chloroethanol in the presence of potassium hydroxide affords a mixture of the corresponding 1,3- and 1,4-disubstituted isomers. The isomers can be distinguished easily by their IR, 1H or 13C NMR spectra. The fragmentation of these compounds in the mass spectrometer is discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.199533701136
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