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  • 1
    Electronic Resource
    Electronic Resource
    Gedunin, ad-seco limonoid (1996)
    Springer
    Journal of chemical crystallography 26 (1996), S. 707-711 
    Details
    ISSN: 1572-8854
    Keywords: Gedunin ; d-seco limonoid ; natural insecticides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Chloroform/Methanol extraction of the bark ofCedrela salvadorensis (Meliaceae), followed by chromatography afforded the crystalline C28H34O7 terpene. The structure first proposed by spectroscopy is confirmed by this X-ray analysis as 7α-acetyloxy-14,15:21,23-diepoxy-4,4,8-trimethyl-d-homo-24-nor-17-oxachola-1,20,22-triene-3,16,-dione. The title compound crystallized in the orthorhombic space groupP212121 with unit cell parametersa=10.243(2),b=13.356(3) andc=18.058(4) Å. The molecule is comprised of a six-membered tetracyclic skeleton, with a circular arc overall conformation. No intermolecular hydrogen bonding is indicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01991968
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phytogrowth Properties of Limonoids Isolated from Cedrela ciliolata (1999)
    Springer
    Journal of chemical ecology 25 (1999), S. 2665-2676 
    Details
    ISSN: 1573-1561
    Keywords: Cedrela ciliolata ; photogedunin ; photogedunin acetates ; phytogrowth inhibition ; seed respiration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract An epimeric mixture of the limonoid photogedunin, isolated from the heartwood of C. ciliolata, as well as its R- and S-acetate derivative were evaluated for phytotoxicity in mono- and dicotyledoneous plants. A mixture of epimeric photogedunin 1 and 2, a mixture of epimeric photogedunin acetate, (R)-photogedunin acetate 3, and (S)-photogedunin acetate 4 inhibited seed germination, seedling growth, and root and hypocotyl/coleoptyle growth in all species assayed. The concentration of phytochemicals required for 50% inhibition ranged from 4.5 to 300 μM. Inhibitory plant responses appeared to require that the OH-group at C-23 be acetylated in photogedunin, since the nonacetylated compound showed less phytotoxic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1020891205680
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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