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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 486 (1982), S. 39-44 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Phosphorus. 106. Synthesis and Properties of the Diphosphacyclopropane (t-BuP)2CHMeThe new 1,2-di-tert-butyl-3-methyl-1,2-diphosphacyclopropane (1,2-di-tert-butyl-3-methyl-diphosphirane), (t-BuP)2CHMe (1), is obtained by reacting K(t-Bu)P—P(t-Bu)K with 1,1-dichloroethane under suitable conditions. 1 can be isolated by high vacuum distillation and is stable for months when stored under inert gas at room temperature. Particularly, no dimerization to the corresponding 1,2,4,5-tetraphosphacyclohexane takes place. The NMR parameters indicate an increase of the exocyclic bond angles compared to (t-BuP)2CH2. The signs of all CP coupling constants have been determined by spin tickling experiments. The 2J(CCP)-coupling of the methyl group at the ring carbon depends strongly on the dihedral angle.
    Notes: Die Reaktion von K(t-Bu)P—P(t-Bu)K mit 1,1-Dichlorethan führt unter geeigneten Bedingungen zu dem neuen 1,2-Di-tert-butyl-3-methyl-1,2-diphosphacyclopropan (1,2-Di-tert-butyl-3-methyl-diphosphiran), (t-BuP)2CHMe (1). Verbindung 1 kann durch Hochvakuumdestillation isoliert werden und ist unter Inertgas bei Raumtemperatur monatelang beständig. Insbesondere tritt keine Dimerisierung in das entsprechende 1,2,4,5-Tetraphosphacyclohexan ein. Aus den NMR-Parametern geht hervor, daß die exocyclischen Bindungswinkel im Vergleich zum (t-BuP)2CH2 aufgeweitet sind. Die Vorzeichen sämtlicher CP-Kopplungen konnten durch Spin-Tickling-Experimente festgelegt werden. Die 2J(CCP)-Kopplung der Methylgruppe am Ringkohlenstoff ist signifikant diederwinkelabhängig.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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