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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3656-3670 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Reaction of λ3-Phosphorins with Diazoalkanes in the Presence of Protic Nucleophiles to Form 1-Alkyl-1-hetero-substituted λ5-Phosphorins2,4,6-Trisubstituted λ3-phosphorins (1) react with diazoalkanes (2) in the presence of protic nucleophiles (3) (alcohols, phenols, thiols, amines) to produce 1-alkyl-1-hetero-substituted λ5-phosphorins (4, No. 1-39), the properties of which are described. The mechanism of this reaction is considered as a nucleophilic attack of the diazoalkane at the phosphorus atom in the primary step; with elimination of nitrogen the charge of phosphorus is changed from negative to positive so that subsequently attack of the nucleophile at the phosphorus atom and protonation of the anionic alkyl residue are possible. Organic azides in the presence of alcohols or phenols react analogously affording 1-alkyloxy- or 1-aryloxy-1-alkylamino- or -arylamino-substituted λ5-phosphorins. In the absence of the nucleophile with diphenyldiazomethane compound 11 has been isolated. Its formation is discussed as occurring via the same initial step.
    Notes: 2,4,6-Trisubstituierte λ3-Phosphorine (1) reagieren mit Diazoalkanen (2) in Gegenwart von protischen Nucleophilen (3) (Alkoholen, Phenolen, Thiolen, Aminen) zu 1-alkyl-1-hetero-substituierten λ5-Phosphorinen (4, lfd. Nr. 1-39), deren Eigenschaften beschrieben werden. Der Mechanismus der Reaktion wird im Primärschritt als nucleophiler Angriff des Diazoalkans am Phosphoratom, einer Umpolung des negativ zum positiv geladenen Phosphors durch Abspaltung des Stickstoffs mit einem nachfolgenden Angriff des Nucleophils am Phosphoratom und Protonierung des anionischen Alkylrestes gedeutet. Organische Azide in Gegenwart von Alkoholen oder Phenolen reagieren analog zu 1-alkyloxy- bzw. 1-aryloxy-1-alkylamino- bzw. -arylamino-substituierten λ5-Phosphorinen. In Abwesenheit von Nucleophilen konnte mit Diphenyldiazomethan eine Verbindung 11 erhalten werden. Ihre Bildung wird unter Annahme des gleichen Primärschrittes diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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