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  • 1
    ISSN: 0044-2313
    Keywords: Phosphanediyl ; Halogenocyclotetraphosphanes ; NMR Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In situ Generation of [PX] and Insertion into (tBuP)3, (X = Cl, Br). Synthesis of the Functionalized Cyclophosphanes (tBuP)3PX, [1-(tBu)(X)P-2,3,4-(tBu)3]P4 and Structure Analysis of (tBuP)3PClThe redox system PX3/SnX2 (X = Cl, Br) can be used as a source for the in situ generation of halogenphosphanediyl [PX]. In the presence of tri-t-butylcyclotriphosphane (tBuP)3 the intermediately formed [PX] is added to a ring P atom followed by an insertion reaction, which leads to a ring expansion, whereby monohalogenocyclotetraphosphanes (tBuP)3PX (X = Cl, Br; 1, 2) are formed. Excess [PX] does not lead to further ring expansion but through a complex reaction course to the functionalized cyclotetraphosphanes [1-(tBu)(X)P-2,3,4-(tBu)3]P4, 3 (X = Br); 7 (X = Cl). 1, 2 and 3 could be obtained in a pure form and NMR and mass spectroscopically, 7 31P-NMR spectroscopically, characterized. For 1 and 7 31P—35,37Cl-isotopic shifts could be identified. 1 was further characterized by an X-ray structure analysis.
    Notes: Das Redoxsystem PX3/SnX2 (X = Cl, Br) kann als Quelle zur in situ-Bildung von Halogenphosphandiyl [PX] verwendet werden. In Gegenwart von Tri-t-butylcyclotriphosphan (tBuP)3 wird intermediär auftretendes [PX] zuerst an ein Ring-P-Atom addiert, dann unter Ringexpansion insertiert, wobei Monohalogenocyclotetraphosphane (tBuP)3PX (X = Cl, Br; 1, 2) gebildet werden. Überschüssiges [PX] führt nicht zu einer weiteren Ringexpansion; vielmehr entstehen in einem komplexen Reaktionsverlauf die funktionalisierten Cyclotetraphosphane [1-(tBu)(X)P-2,3,4-(tBu)3]P4, 3 (X = Br); 7 (X = Cl). 1, 2 und 3 konnten in reiner Form isoliert und NMR- sowie massenspektroskopisch, 7 31P-NMR-spektroskopisch, charakterisiert werden. Bei 1 und 7 konnten 31P—35,37Cl-Isotopieverschiebungen nachgewiesen werden. Von 1 wurde eine Röntgenstrukturanalyse durchgeführt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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