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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 902-913 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Liquid-crystalline Heterocycloalkanes. I. Synthesis and Properties of Substituted 1,3-DioxanesThe synthesis of 2,5-disubstituted 1,3-dioxanes is described, their melting and clearing points and their physical properties (dielectric anisotropy, viscosity, transition enthalpies, optical birefringence) are investigated. The cyano substituted 1,3-dioxans 5 and 7 are valuable materials for application in displays.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 469 (1980), S. 179-187 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure Investigations on Pseudochalcogene Phosphorus Compounds. I. Crystal and Molecular Structure of Triphenylphosphonio DicyanomethylideThe title compound with the formula Ph3PC(CN)2 crystallizes in the monoclinic space group P21/c with cell parameters a = 948 pm, b = 1080 pm, c = 1756 pm, β = 104.5°. The structure has been solved by the heavy atom method. The refinement using anisotropic temperature factors for all non-hydrogen atoms yielded a final R value of 0.115. The molecular geometry including interatomic distances and bond angles is compared with literature data and discussed. The P—C bond lengths have been found to P—C(ylide) = 175.3 pm and P—C(phenyl) = 180.8 pm (average value).
    Notes: Die Verbindung Triphenylphosphonio-dicyanmethylid Ph3PC(CN)2 (1) kristallisiert in der monoklinen Raumgruppe P21/c, Gitterkonstanten: a = 948 pm, b = 1080 pm, c = 1756 pm, β = 104,5°. Die Struktur von 1 konnte nach der Schweratommethode gelöst und unter Verwendung anisotroper Temperaturparameter für die Nicht-Wasserstoffatome bis zu einem R-Wert von 0,115 verfeinert werden. Die Molekülgeometrie sowie die Bindungslängen und-winkel werden mit entsprechenden Literaturwerten verglichen und diskutiert. Für die Bindungslängen zwischen Phosphor und Kohlenstoff wurden die Werte P—C(Ylid) = 175,3 pm und P—C(Phenyl) = 180,8 pm (Mittelwert) gefunden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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