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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and complexing properties of a double-calix[4]arene crown ether (1992)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 13 (1992), S. 163-169 
    Details
    ISSN: 1573-1111
    Keywords: Calix[4]arene ; complexation of alkali cations ; stability constants ; biphasic transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Treatment ofp-tert-butylcalix[4]arene with tetraethyleneglycol ditosylate in the presence of potassium carbonate in acetonitrile afforded the first example of a double-calixcrown (1) in 52% yield. The double-calixcrown (1) was shown to form 1: 1 complexes with potassium and rubidium picrates in the solid state and in solution in chloroform. The stability constants of the alkali complexes have been determined in acetonitrile, as well as the phase transfer parameters from water to dichloromethane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053640
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  • 2
    Electronic Resource
    Electronic Resource
    A Schiff basep-tent-butylcalix[4]arene. Synthesis and metal ion complexation (1992)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 14 (1992), S. 141-147 
    Details
    ISSN: 1573-1111
    Keywords: 1,3-bridged calix[4]arene ; Schiff base ; alkaline and alkaline-earth cations ; transition metals ; stability constants ; biphasic transfer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract This communication describes the synthesis of Schiff base calix[4]arene (1) in which the Schiff base unit bridges two opposite hydroxy groups ofp-tert-butylcalix[4]arene. The synthesis of (1) has been achieved by refluxing in acetonitrile-methanol the appropriate 1,3-dicarbaldehyde-p-tert-butyl-calix[4]arene (4) with 1,3-diaminopropane. The yield of the reaction is 19%. Ligand (1) possesses a compartment containing two nitrogen atoms, four ether-type oxygen atoms, and two ionizable hydroxy groups likely to complex metal cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01029661
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