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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2609-2615 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Conformational Analysis, XXII. Twist-Boat Conformation of Methyl 2,3,4-Tri-O-benzoyl-β-D-xylopyranoside in the CrystalMethyl 2,3,4-tri-O-benzoyl-β-D-xylopyranoside (5) crystallizes in the monoclinic space group P21 with two molecules in the asymmetric unit. Structure analysis (R-value 0.044) reveals that in the crystal 5 is present in a twist-boat conformation 2So in which the atoms C1, C3, C4, C5 and O5, C1, C2, C4 lie in one plane. In solution, 5 shows an equilibrium of the chair conformations with a proportion of 26% of the 1C4-form.
    Notes: Methyl-2,3,4-tri-O-benzoyl-β-D-xylopyranosid (5) kristallisiert in der monoklinen Raumgruppe P21 mit 2 Molekülen in der asymmetrischen Einheit. Die Strukturanalyse (R-Wert 0.044) ergibt, daß 5 im Kristall in einer Twist-Boat-Konformation 2So vorliegt, bei der die Atome C1, C3, C4, C5 und O5, C1, C2, C4 in einer Ebene liegen. In Lösung weist 5 ein Konformerengleichgewicht der Sesselformen mit einem Anteil von 26% 1C4-Form auf.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cycloaddition with Unsaturated Carbohydrates, II1).  -  Synthesis and Structure of 2,3-Dideoxy-4′,5′-dihydro-α-D-manno-hexopyranosido[2,3-a]isoxazoleBy 1,3-dipolar cycloaddition of ethyl 4,6-di-O-acetyl-2,3-dideoxy-α-D-erythro-hex-2-enopyranoside (1) with benzonitrile oxide, ethyl 4,6-di-O-acetyl-2,3-dideoxy-4′,5′-dihydro-3′-phenyl-α-D-manno-hexopyranosido[2,3-d]isoxazole (2) was prepared. The structure was determined by X-ray analysis.
    Notes: Durch 1,3-dipolare Cycloaddition von Ethyl-4,6-di-O-acetyl-2,3-didesoxy-α-D-erythro-hex-2-eno-pyranosid (1) mit Benzonitriloxid wurde Ethyl-4,6-di-O-acetyl-2,3-didesoxy-4′,5′-dihydro-3′-phenyl-α-D-manno-hexopyranosido[2,3-d]isoxazol (2) erhalten. Die Struktur wurde durch Röntgenstrukturanalyse bestimmt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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