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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2380-2388 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On 2-tert-Butyl-l,3,2λ5-dioxaphospholanes and 2-tert-Butyl-1,2λ5-oxaphosphetanesOxidative addition of hexafluoroacetone to the phosphorus(III) compounds 1c-g furnished the 1,3,2λ5-dioxaphospholanes 2c, 2d, 2f, 2g, and the 1,2λ5-oxaphosphetane 3, respectively; 2d undergoes thermal rearrangement to the corresponding l,2λ5-oxaphosphetane 4. The phospholes 5 and 6 are formed from hexafluorobiacetyl with phosphinous acid esters. 19F NMR spectroscopy was employed to investigate dynamic effects in the compounds obtained. For the phosphorane 2 c magnetic nonequivalence of the CF3 groups of the dioxaphospholane ring system as well as of those of the (CF3)2CHO group was observed. The related compounds 7-9 were studied for comparison, and the influence of the bulky tert-butyl groups at phosphorus was investigated.
    Notes: Durch oxidative Addition von Hexafluoraceton an die Phosphor(III)-Verbindungen 1c-g werden die 1,3,2λ5-Dioxaphospholane 2c, 2d, 2f und 2g bzw. das 1,2λ5-Oxaphosphetan 3 gebildet; 2d lagert sich thermisch in das entsprechende 1,2λ5-Oxaphosphetan 4 um. Die Phosphole 5 und 6 entstehen aus Hexafluorbiacetyl und Phosphinigsäureestern. Mit Hilfe der 19 F-NMR-Spektroskopie wurden dynamische Effekte untersucht. Bei dem Phosphoran 2c tritt magnetische Nichtäquivalenz sowohl der CF3-Gruppen des Dioxaphospholan-Ringsystems als auch der des (CF3)2CHO-Restes auf. Die analogen Verbindungen 7-9 wurden zur vergleichenden Betrachtung herangezogen und der Einfluß der raumerfüllenden tert-Butylgruppe am Phosphor studiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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