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  • Keywords. Spiro(cyclohexadiene-indolines); Enantiomers; Enantioselective liquid chromatography; Thermal racemization.  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 130 (1999), S. 355-361 
    ISSN: 1434-4475
    Keywords: Keywords. Spiro(cyclohexadiene-indolines); Enantiomers; Enantioselective liquid chromatography; Thermal racemization.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  Die Enantiomeren von substituierten Spiro(cyclohexadien-indolinen) wurden durch enantioselektive Flüssigkeitschromatographie mit den Solvent/Sorbens-Systemen Triacetylcellulose/Methanol, Triacetylcellulose/Ethanol/Wasser und (+)-Poly(tritylmethacrylat)/SiO2/n-Hexan/Isopropanol getrennt. Aus thermischen Racemisierungen wurden die Barrieren der Enantiomerisierung für eine Reihe von Derivaten bestimmt. Ein Mechanismus der thermischen Ringöffnung und des Ringschlusses wird auf der Grundlage der Woodward-Hoffmann-Regeln diskutiert.
    Notes: Summary.  The separation of the enantiomers of substituted spiro(cyclohexadiene-indolines) was performed by enantioselective liquid chromatography with the sorbent/solvent systems triacetylcellulose/methanol, triacetylcellulose/ethanol/water, and (+)-poly(trityl methacrylate)/SiO2/n-hexane/isopropanol. The interconversion barriers of the enantiomers were determined for a series of derivatives by thermal racemization. A mechanism for the thermal ring opening/ring closure is discussed in terms of the Woodward-Hoffmann rules.
    Type of Medium: Electronic Resource
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