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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Flüssigkeits-Chromatographie an Triacetylcellulose, 6. Synthese, chromatographische Anreicherung von Enantiomeren und Enantiomerisierungs-Schwellen helicaler PhenanthreneDie Enantiomerisierungs-Schwellen (Tab. 1) neuer 4,5-disubstituierter Phenanthrene der Typen A und B wurden durch Koaleszenz von 1H-NMR-Signalen oder durch thermische Racemisierung chromatographisch angereicherter Enantiomerer ermittelt. Die Schwellen hängen vom Raumbedarf der Gruppen R = CMe3, Br, Me, Cl, OBz in A und B ab; das Verhalten anellierter Benzo-Ringe anstelle von R wird diskutiert.
    Notes: Enantiomerization barriers (Table 1) for novel 4,5-disubstituted phenanthrenes of types A and B have been determined by coalescence of 1H NMR signals or by thermal racemization of chromatographically enriched enantiomers. The barriers depend upon the size of the groups R = CMe3, Br, Me, Cl, OBz in A and B, the behaviour of annelated benzo rings instead of R being particularly considered.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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