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  • Articles: DFG German National Licenses  (2)
  • Gedunin  (1)
  • Keywords. P-Epimeric phosphoramidates; O-Cholesteryl derivatives; X-Ray structure determination.  (1)
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  • Articles: DFG German National Licenses  (2)
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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
    Synthesis and Structural Characterizationof the Two Epimeric O-Cholesteryl-O-phenyl-N-phenylphosphoramidates (1999)
    Springer
    Monatshefte für Chemie 130 (1999), S. 1129-1136 
    Details
    ISSN: 1434-4475
    Keywords: Keywords. P-Epimeric phosphoramidates; O-Cholesteryl derivatives; X-Ray structure determination.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung.  O-Cholesteryl-O-phenyl-N-phosphoramidat wurde als Zwischenprodukt für die stereoselektive Synthese von Organophosphaten und Phosphorthioaten dargestellt. Die Einkristallröntgenstrukturanalyse ergab vier unabhängige P-epimere Phosphoramidate, die in der triklinen Raumgruppe P1 kristrallisieren. Sie liegen im Kristall selektiv gepaart in From von pseudo-zentrosymmetrischen Dimeren vor, die über Wasserstoffbrücken zwischen der Amidgruppe des einen Epimers und der Phosphinoylgruppe des zweiten aneinander gebunden sind.
    Notes: Summary.  O-Cholesteryl-O-phenyl-N-phenylphosphoramidate was synthesized as intermediate for the stereoselective synthesis of organophosphates and phosphorothioates. Single crystal X-ray diffraction discerned four independent P-epimeric phosphoramidates cocrystallizing in the triclinic P1 space group. They were found to be selectively paired in the crystal forming pseudo-centrosymmetric dimers via hydrogen bonds between the amide group of one epimer and the phosphinoyl group of the other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00010291
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    Paper (German National Licenses)
    Fulltext
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