Abstract
Selective transmembrane carriers for a-hydroxy acids, acyclic a-amino phosphonates and calix[4]arenes containing a-aminophosphonate substituents at the lower rim have been synthesized; analytical HPLC has been used to monitor the selective separation of dicarboxylic, a-hydroxy and a-amino acid mixtures by membrane extraction; the attachment of a-aminophosphonate fragments to the macrocyclic calix[4]arene platform results in receptors with markedly modified efficiency and selectivity relative to those of only aminophosphonates.
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