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  • 1
    Electronic Resource
    Electronic Resource
    Ring contraction in schiff base macrocycles: The X-Ray crystal structure of an imidazolidine-containing macrocycle (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 11 (1991), S. 63-69 
    Details
    ISSN: 1573-1111
    Keywords: Macrocycle ; Schiff base ; imidazolidine ring contraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cyclocondensation of benzene-1,3-dicarbaldehyde and 3-azapentane-1,5-diaminein acetonitrile leads to isolation of an 18-membered imidazolidine-containing Schiff base macrocycle rather than the anticipated 24-membered tetraimine Schiff base macrocycle. This has occurred as a consequence of internal nucleophilic addition of the secondary amine functions across adjacent azomethine bonds. The X-ray crystal structure of the imidazolidine-containing Schiff base macrocycle is reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01073685
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Macrobicyclic aminals (1992)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 12 (1992), S. 175-186 
    Details
    ISSN: 1573-1111
    Keywords: Macrobicyclic ; aminals ; X-ray crystal structure ; tetraimine macrocycles ; Schiff base
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The synthesis of Schiff base macrocycles in the absence of templating cations and in non-protic and non-coordinating solvent media is reported. The reaction of pyridine-2,6-dicarboxaldehyde with the diamines 1,2-bis(2-aminophenoxy) ethane and 1,4-bis(2-aminophenoxy) butane has been found to give the corresponding macrobicyclic aminals. The chemical properties of the aminals are reported together with a preliminary study of their metal complexation reactions. The X-ray crystal structure of the aminal derived from pyridine-2,6-dicarboxaldehyde and 1,2-bis(2-aminophenoxy) ethane has been determined and verifies the macrobicyclic nature of the product.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053860
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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