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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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Two New Carbon-Free Indium(III) Asymmetric Chelates - Synthesis and X-ray Crystal Structures of [In{Ph2P(O)NP(S)Ph2-O,S}3]·3/4 C6H6 and [InCl{Ph2P(S)NP(Se)Ph2-S,Se}2] (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1613-1616 
    Details
    ISSN: 1434-1948
    Keywords: Indium ; Chalcogens ; Chelates ; Phosphazenes ; Metallacycles ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The ligands [Ph2(S)PNHP(X)Ph2]- (X = O, Se) react with InCl3 in a 3:1 ratio to give a tris-chelate [In{Ph2P(O)NP(S)Ph2-O,S}3]·0.75 C6H6 (2) and the unexpected pentacoordinate derivative [InCl{Ph2P(Se)NP(S)Ph2-Se,S}2] (3). These compounds have been characterized by means of IR, 1H- and 31P-NMR spectroscopy, positive-ion FAB mass spectrometry and elemental analysis. The molecular structures have been determined by single-crystal X-ray diffraction analysis. The coordination geometry in 2 resembles that observed in the three analogous tris-chelates incorporating the corresponding symmetrical oxygen, sulfur and selenium ligands. Compound 3 exhibits a very distorted trigonal-bipyramidal geometry at indium, where both the selenium and chlorine atoms are in equatorial positions, while the sulfur atoms are in axial positions.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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