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  • 1
    Electronic Resource
    Electronic Resource
    Semicarbazones and thiosemicarbazones, XII: Crystal structure of salicylaldehyde semicarbazone (1990)
    Springer
    Monatshefte für Chemie 121 (1990), S. 641-647 
    Details
    ISSN: 1434-4475
    Keywords: Salicylaldehyde semicarbazone ; Semicarbazone ; Crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kristallstruktur und die molekulare Struktur des Salicylaldehyd-Semicarbazons wurde über Einkristall-Röntgenstreuung ermittelt. Das O-Atom des Semicarbazonteils stehtanti zum N-Atom der Hydrazin-Gruppierung. Die Bindungslängen in der Semicarbazoneinheit zeigen eine Delokalisierung der π-Elektronen an. Die Geometrie der Verbindung wird durch stabilisierende intra- und intermolekulare Wasserstoffbrückenbindungen bestimmt.
    Notes: Summary The crystal and molecular structure of salicylaldehyde semicarbazone was obtained by single crystal X-ray diffraction. The O atom of the semicarbazone fragment isanti to the N atom of the hydrazinic group. The distribution of bond lengths in the semicarbazone fragment indicates delocalization of the π-electrons. The crystal structure is stabilized by intra- and intermolecular hydrogen bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809767
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  • 2
    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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