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  • Phosphorus  (2)
  • 1,2-Azaphosphindole  (1)
  • Cyclocondensation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Molecular Modeling, a Tool for Predicting Structural Effects on the Macrocyclization Reaction between Bis(vinyl or allyl) Dialdehydes and Thiophosphonic Bis(hydrazides) (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 443-447 
    Details
    ISSN: 0009-2940
    Keywords: Phosphorus macrocycles ; Molecular modeling ; Cyclocondensation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of new phosphorus dialdehydes PhP(O)-[(CH2)nCH=CHC6H4CHO]2 (4a-c, 5a) (n = 0:4, n = 1:5; a:para, b:meta, c:ortho), with thiophosphonic bis(hydrazide) PhP(S)[NMeNH2]2 (6) yields macrocyclic compounds 9b′, c′, 10a′, 9a″, b″, c″, 10a″ and 9c′″, arising from the cyclocondensation of one, two, or three equivalents of each reagent, respectively. Molecular modeling of 4a-c, 5a, 6 and of the intermediate monocondensation products 7a-c, 8a was carried out and points out the importance of the geometry of the starting reagents in the competition between inter- and intramolecular cyclocodensation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280502
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    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
    Keywords: Phosphorus ; Ferrocenes ; Phosphorylated iminophosphoranes ; Dendrimers ; Cations ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    2H-1,2-Azaphosphindoles - Synthesis and Characterization (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 417-421 
    Details
    ISSN: 1434-1948
    Keywords: Phosphorus ; Benzynezirconocenes ; Azazirconacyclopentenes ; Exchange reactions ; 1,2-Azaphosphindole ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The first 1,2-azaphosphindoles 14a,b, 15a,b were obtained in a straightforward manner upon heating diphenylzirconocene in the presence of a cyanophosphane, which afforded azazirconacyclopentenes 11a,b which can be reacted with various dichlorophosphanes. The use of the tetrachlorodiphosphane Cl2P(CH2)2PCl2 instead of a dichlorophosphane allowed the preparation of the bis(1,2-azaphosphindoles) 19, 19′. The monosulfur adduct of the azaphosphindole 14a, i.e. 16a, was characterized by X-ray structure analysis. Alkylation of 14a or 16a with methyltrifluoromethane sulfonate occurred selectively on the intracyclic phosphorus atom or on the sulfur atom, giving the salts 20 or 21, respectively.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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