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  • 1
    ISSN: 0044-2313
    Keywords: Tetraisopropyldodecaphosphane(4) ; 3,4,9,10-Tetraorganylpentacyclo-[6.4.O.O2,6.O5,12.O7,11]dodecaphosphanes ; Organylpolycyclophosphanes ; Configurational Isomers of Polycyclic Phosphanes ; Inversion of Phosphorus in Polycyclic Phosphanes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 212. Tetraisopropyldodecaphosphane(4), P12i-Pr4 - Preparation, Properties, and Molecular DynamicsAccording to an earlier crystal structure analysis, tetraisopropyldodecaphosphane(4) (1) exhibits the symmetry C2, and the substituents are arranged in all-trans position [3]. We have now found by NMR spectroscopic studies that in solution a second configurational isomer of the symmetry CS (1b) exists in addition to the molecule present in the crystal (1a). The transformation of 1a into 1b, which can only occur through a quasi synchronous inversion at the atoms P3 and P4 or P9 and P10, takes place at a noticeable rate already below room temperature.
    Notes: Tetraisopropyl-dodecaphosphan(4) (1) weist nach einer früheren Kristallstrukturanalyse die Symmetrie C2 mit all-trans-Anordnung der Substituenten auf [3]. Durch kernresonanzspektroskopische Studien konnte jetzt in Lösung neben dem im Kristall vorliegenden Molekül (1a) ein zweites Konfigurationsisomer der Symmetrie CS (1b) aufgefunden werden. Die Umwandlung von 1a in 1b, die nur durch quasi-synchrone Inversion an den Atomen P3 und P4 oder P9 und P10 erfolgen kann, läuft bereits unterhalb Raumtemperatur mit merklicher Geschwindigkeit ab.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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