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  • 1975-1979  (1)
  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Phosphazenes. LXVI. 31P-NMR Investigations. XI. Preparation of Cyclotri(phosphazene) Derivatives via the Corresponding Lithium Compound and Spreading of a 31P-NMR Spectrum by a Shift ReagentLess reactive partners such as phosphinyl chlorides do not react with the hydridocyclotri(phosphazene) I, but they react with the lithiated phosphazene II giving P-substituted products. Silyl-, stannyl-, imidophosphinyl- and thiophosphinylcyclotri(phosphazenes) have been prepared as examples. In the dimethylthiophosphinyl derivative VI the two 31P nuclei of the biphosphine grouping are nearly isochronous and their n.m.r. signals as well as those of the methyl protons are therefore degenerate. Using a shift reagent the shift difference can be increased by more than a factor of ten and the degeneracy removed.
    Notes: Mit weniger elektrophilen Partnern wie Phosphinylchloriden kann das Hydridocyclotri(phosphazen) I nicht mehr direkt, wohl aber nach Überführung in seine Lithiumverbindung II am Phosphor substituiert werden. Als Beispiele wurden Silyl-, Stannyl-, Imidophosphinyl- und Thiophosphinylcyclotri(phosphazene) dargestellt. Im Dimethylthiophosphinylderivat VI sind die beiden 31P-Kerne der Biphosphingruppierung nahezu isochron und ihre NMR-Signale und die der Methylprotonen deshalb entartet. Durch ein Shiftreagens kann ihre Verschiebungsdifferenz mehr als verzehnfacht und die Entartung damit aufgehoben werden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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