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  • 1
    Electronic Resource
    Electronic Resource
    Synthese, Kristallstruktur und Konformation vontrans-[2.2](1,2)Ferrocenophan und seinen 1-Hydroxyderivaten (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 799-808 
    Details
    ISSN: 1434-4475
    Keywords: X-ray crystal structure analysis ; 13C- and 1 H-NMR spectroscopy ; exo-exo Chair conformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Starting from1-(dimethylaminomethyl)-2-iodo-ferrocene (3) [2.2](1,2)ferrocenophane (2) was prepared in an 8-step synthesis with 17% overall yield. Both from the oxoderivative12 and the ferrocenophane2 puretrans-isomers (12b and2b, resp.) were obtained; the former (12b) was reduced to a separable mixture ofexo andendo 1-hydroxy-ferrocenophanes13a andb, resp. (∼ 3:7), the configurations of which were assigned by the LIS-method. X-ray crystal structure analysis of2b revealed a centrosymmetrical chair conformation. From1H- and13C-NMR spectra both for2b and for the hydroxyderivatives13 a rigidexo-exo chair conformation was deduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01134191
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  • 2
    Electronic Resource
    Electronic Resource
    Stereochemie planarchiraler Verbindungen, 9. Mitt. (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 605-614 
    Details
    ISSN: 1434-4475
    Keywords: Absolute chiralities ; Circular dichroism ; Configurational correlation ; Triacetylcellulose, chromatography on
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The two isomeric 1,6-methano[10]anulene carboxylicacid methylesters as well as 2,7-methano[10]azaanulene and several of its methyl, methoxycarbonyl and bromo derivatives have been separated into enantiomers by chromatography on triacetyl cellulose in ethanol; in seven from eleven cases baseline separation was achieved and thereby optically pure enantiomers obtained. The optical rotations and circular dichroism spectra of all anulenes were recorded. From chemical correlations and comparison of the CD spectra relative configurations were deduced; from chiroptical comparison with 2-methyl-1,6-methano[10]anulene of known absolute configuration and on the basis of the justmentioned correlations also absolute chiralities were tentatively proposed for the methano[10]azaanulenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798616
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  • 3
    Electronic Resource
    Electronic Resource
    Ferrocene derivatives, part 6757Fe-NMR spectroscopy of ferrocenes (1983)
    Springer
    Monatshefte für Chemie 114 (1983), S. 495-499 
    Details
    ISSN: 1434-4475
    Keywords: 57Fe Shifts ; Hybridization influence on chemical shifts ; Ring tilting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung 57Fe-NMR-Signale von 28 mono- und disubstituierten Ferrocenen mit natürlicher Häufigkeit an57Fe wurden gegen Ferrocen als innerem Standard gemessen. Die meisten Resonanzen sind zu höherer Frequenz verschoben. Die57Fe-Verschiebung reagiert sehr empfindlich auf Ringneigung, wie an [3]Ferrocenophanen gezeigt wurde. Substituenteneinflüsse auf die Verschiebung werden qualitativ diskutiert.
    Notes: Abstract 57Fe NMR-spectra of 28 mono and disubstituted ferrocenes with a natural abundance of57Fe have been measured relative to internal ferrocene. Most of the resonances appear at the high frequency side. The shielding influence of the various substituents is discussed qualitatively.57Fe shifts are very sensitive to ring tilting as occurring in [3]ferrocenophanes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798447
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