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  • 1
    Electronic Resource
    Electronic Resource
    Säurekatalysierte Umlagerung von 7-Hydroxy-royleanon in ein 20(10→9) abeo-Abietan-Derivat und zwei Phenalenone (1975)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 1934-1939 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acid-catalyzed rearrangement of 7-hydroxyroyleanone into a 20(10→9) abeo-abietane derivative and two phenalenonesShort treatment of either horminone (1b), taxoquinone (1a), 6,7-dehydroroyleanone (3) or 6β-hydroxyroyleanone (1c) with 80% H2SO4 at 0° leads to a mixture of rearranged products. Two of the structures, determined by X-ray-cristallography, were found to be (9R, 10R)-20(10→9)-abeo-12-hydroxy-5,7, 12-abietatriene-11,14-dione (4) and 9-isopropyl-2,2,5-trimethyl-8H-phenaleno[1,9-bc]furan-8-one (5), and the third compound, isolated in very small amounts, has been provisionally identified as 3-hydroxy-9-isopropyl-2,2,5-trimethyl-8H-phenaleno[1,9-bc]furan-8-one (6) from the spectroscopic data.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19750580708
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  • 2
    Electronic Resource
    Electronic Resource
    The Crystal and Molecular Structures of Two Acid-Catalysed Rearrangement Products of Taxochinon (1975)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 2009-2018 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The structures of two acid catalysed rearrangement products of taxochinone (1) have been determined by X-ray analysis. One of the products turned out to be a 20 (10→9) abeo-abietane (2), the other an optically inactive phenalenone (3). Crystals of the former compound, C20H26O3, belong to space group P212121 with four molecules per cell and the structure was refined with 879 significant reflexions to R = 0.032. Crystals of the latter compound, C20H22O2, belong to space group P21/c with 12 molecules per cell and the structure was refined with 1823 significant reflexions to R = 0.058.
    Notes: Die Strukturen von zwei säurekatalysierten Umlagerungsprodukten von Taxochinon (1) wurden kristallographisch bestimmt: Die eine Verbindung stellte sich als ein 20 (10 → 9) abeo-Abietan (2) heraus, die andere als ein achirales Phenalenon (3). Die Abietanverbindung, C20H26O3, kristallisiert in der Raumgruppe P212121 mit 4 Molekeln in der Zelle und wurde mit 879 signifikanten Reflexionen bis R = 0,032 verfeinort. Die Phenalenonvervindung, C20H22O2, KRISTALLISIERT IN DER rAUMGRUPPE p21/c mit 12 Molekeln in der Zelle und wurde mit 1823 signifikanten Reflektionen bis R = 0,058 verfeinert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19750580715
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  • 3
    Electronic Resource
    Electronic Resource
    Horminon, Taxochinon und weitere Royleanone aus 2 abessinischen Plectranthus-Spezies (Labiatae) (1975)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 1921-1934 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Horminone, taxoquinone and other royleanones, obtained from two Abyssinian Plectranthus species (Labiatae).From the coloured glands on the leaves of two botanically unclassified Plectranthus sp. from Abyssinia, a series of royleanones has been isolated, namely royleanone (1) and 6,7-dehydroroyleanone (2) from one species, and 6,7-dehydroroyleanone, horminone (3), taxoquinone (4), 6β, 7α-dihydroxyroyleanone (5), 7α-acetoxy-6β-hydroxyroyleanone (6) and 7-oxoroyleanone (7) respectively, from the other.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19750580707
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    Paper (German National Licenses)
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