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  • Title: Direct synthesis of sulfonated azacalixarenes in water.
    Author: Clayden J, Rowbottom SJ, Ebenezer WJ, Hutchings MG.
    Journal: Org Biomol Chem; 2009 Dec 07; 7(23):4871-80. PubMed ID: 19907777.
    Abstract:
    Successive treatment of cyanuric chloride with two aromatic diamines, at least one of them sulfonated, yields water-soluble sulfonated azacalix[4]arenes which may be isolated by crystallisation. Functionalised azacalixarenes may be made by first displacing two chloro substituents from the cyclisation precursor. Attempted formation of an azacalix[6]arene led to a dimeric species for which two structures may be proposed, one of them an azacalixarene catenane.
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