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  • 1
    Electronic Resource
    Electronic Resource
    11β-Hydroxyobacunone (zapoterin) (2000)
    Springer
    Journal of chemical crystallography 30 (2000), S. 727-730 
    Details
    ISSN: 1572-8854
    Keywords: zapoterin ; A,D-bis-seco limonoid ; triterpene ; casimiroa edulis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of zapoterin C26H30O8 isolated from Casimiroa edulis has been determined and the compound crystallizing in the monoclinic space group P21 with a = 7.486(1), b = 16.247(3), c = 9.736(2) Å, β = 98.77(1)°, V = 1170.3(4) Å3, and Z = 2 was confirmed as 11β-hydroxyobacunone (11β-hydroxy-14,15:21,23-diepoxy-4,4,8-trimethyl-A,D-di-homo-24-nor-4,17-dioxa-chola-1,20,22-triene-3,7,16-trione) 1. The molecule comprises a tetracyclic skeleton with homo-oxa rings A and D. In the crystal, molecules form infinite ribbons along the b axis by hydrogen bonding involving the hydroxyl group and the carbonyl group of the seven-membered lactone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012250211856
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  • 2
    Electronic Resource
    Electronic Resource
    Tonalensin, a 5,10-seco-neoclerodane diterpenoid (1996)
    Springer
    Journal of chemical crystallography 26 (1996), S. 239-242 
    Details
    ISSN: 1572-8854
    Keywords: Tonalensin ; 5,10-seco-neoclerodane ; diterpenoid ; cyclodeca-1,3,5-triene
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We report the X-ray study on the structure of a newseco-neoclerodane diterpenoid, tonalensin, isolated from the aerial parts ofSalvia tonalensis. The compound crystallizes in the monoclinic space groupP21 witha=10.146(2),b=7.620(2),c=11.316(2) Å, β=109.58(2)°. Thetrans,cis,cis-cyclodeca-1,3,5-triene ring adopts a boat-chair conformation in which the Δ1,3,5-triene system is no longer coplanar. The γ-lactone and furan rings are essentially planar, while both five-membered rings of the dioxabicylooctane moiety arecis-fused and adopt a twist conformation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01673679
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