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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 3894-3899 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Unsymmetrical N-substituted Bispidines (3,7-Diazabicyclo[3.3.1]nonanes), II.The 3,7-bicyclo[3.3.1]nonanes-2,4,6,8-tetraones 5-7, isolated as mixtures of steric isomers, have been separated into the pure components. Their configurations have been determined by 1H NMR spectroscopy (comparison with the prepared compouds 11-15).
    Notes: Die 3,7-Diazabicyclo[3.3.1]nonan-2,4,6,8-tetraone 5-7, die bei der Synthese als sterische Isomerengemische anfallen, werden in die reinen Komponenten aufgetrennt. Mit Hilfe der 1H-NMR-Spektren (Vergleich mit den dargestellten Verbindungen 11-15) läßt sich die Konfiguration bestimmen.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1980 (1980), S. 542-556 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Annelation Reactions of N-Heterocycles to Condensed Pyridones with Bridgehead NitrogenThe Horner-Wittig reaction of aromatic and heteroaromatic aldehydes with phosphono succinates gives the methylenesuccinates 2a - m and 4a - k in satisfactory yields. The compounds obtained have the E-configuration, as shown by 1H-NMR-spectroscopic and by chemical investigations. When heterocyclic aldehydes 3a - m having a formyl function in the α-position to a nitrogen atom are used in this reaction, pyridones 5a - m with bridgehead nitrogen can be obtained directly or via the methylene succinates.
    Notes: Die Horner-Wittig-Reaktion von aromatischen und heteroaromatischen Aldehyden mit Phosphonobernsteinsäureestern führt zu den Methylenbernsteinsäureestern 2a - m und 4a - k in befriedigenden Ausbeuten. Wie durch 1H-NMR-spektroskopische und chemische Untersuchungen gezeigt wird, haben diese Verbindungen E-Konfiguration. Setzt man die heterocyclischen Aldehyde 3a - m mit Formylgruppe in α-Stellung zu einem Stickstoffatom um, so können  -  direkt oder über die Methylenbernsteinsäureester  -  die kondensierten Pyridone 5a - m erhalten werden.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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