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  • 1
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Synthesis of a Spirocyclic Phosphoranide Anion: Model of an Intermediate in a SN2(P) ReactionIn an acid-base reaction the hydrophosphorane 9 reacts with triethylamine to give the spirocyclic phosphoranide 10, which is P-methylated by methyl iodide to form phosphorane 7 and O-silylated by trimethylsilyl iodide to form phosphite 12. The X-ray structure analysis of 10 shows a highly distorted trigonal bipyramide with the stereochemical active free electron pair in equatorial position. The difference in length of the axial P—O bonds is 0.25 Å. There is evidence for an equilibrium of 10 with the monocyclic phosphite alkoxide 10a in solution.
    Notes: Durch Säure-Base-Reaktion des Hydrophosphorans 9 mit Triethylamin entsteht das spirocyclische Phosphoranid 10, welches durch Methyliodid zu dem Phosphoran 7 P-methyliert und durch Trimethylsilyliodid zu dem Phosphit 12 O-silyliert wird. Die Röntgenstrukturanalyse von 10 ergibt eine stark verzerrte trigonale Bipyramide, in der das freie Elektronenpaar in äquatorialer Position sterisch wirksam wird. Die axialen P—O-Bindungen weisen einen Längenunterschied von 0.25 Å auf. In Lösung liegt 10 offenbar im Gleichgewicht mit dem monocyclischen Phosphitalkoxid 10a vor.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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