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  • Digitale Medien  (2)
  • Dendrimers  (2)
  • 1
    Digitale Medien
    Digitale Medien
    N-Thiophosphorylated and N-Phosphorylated Iminophosphoranes [R3P=N-P(X)R′2; × = O, S] as Models for Dendrimers: Synthesis, Reactivity and Crystal Structures (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 601-611 
    Details
    ISSN: 1434-1948
    Schlagwort(e): Phosphorus ; Ferrocenes ; Phosphorylated iminophosphoranes ; Dendrimers ; Cations ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Several R3P=N-P(X)R′2 and Fe[C5H4Ph2P=N-P(X)R′2]2 derivatives (X = S, O) are readily obtained from Staudinger reactions between phosphanes and N3-P(X)R′2. The P=N-P=X groups are easily alkylated on the × atom with methyl or isopropyl triflates. The alkylation induces a lengthening of the P-X bond, as shown by X-ray diffraction studies. This corresponds to a weakening of the P-X bond which can be cleaved with P(NMe2)3 to yield [P=N-P:] linkages. The presence of tricoordinated phosphorus atoms opens the way to a versatile reactivity, including the reaction with alkyl iodides and functionalized azides. These molecules are good models for screening which types of reagents and reactions could be used with macromolecules possessing also P=N-P=X linkages, such as dendrimers.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
  • 2
    Digitale Medien
    Digitale Medien
    Grafting of Tetraazamacrocycles on the Surface of Phosphorus-Containing Dendrimers (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 1701-1708 
    Details
    ISSN: 1434-193X
    Schlagwort(e): Dendrimers ; Macrocycles ; Phosphorus heterocycles ; Hydrazones ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Three types of tetraazamacrocycles (1,4,8,11-tetraazacyclotetradecane, 1,4,8,12-tetraazacyclopentadecane, and 1,4,8,11-tetraazacyclotetradecane-5,7-dione) are grafted on the surface of phosphorus-containing dendrimers possessing P(S)Cl2 end groups (for generations 1 and 3: this corresponds to three and twelve macrocycles, respectively) and on the model compound PhCH=NN(Me)P(S)Cl2. Depending on the nature of the macrocycle, the reaction induces the formation of five-membered rings (diazaphospholanes) or of six-membered rings (diazaphosphorinanes). The structure of the adducts is deduced from 13C NMR spectra and from X-ray diffraction studies of the reaction products (8, 9, 10) of the model compound.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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