CROWN CALIX[4]ARENES, METHOD OF PREPARATION AND USE FOR SELECTIVE EXTRACTION OF CAESIUM

摘要

The invention concerns novel calixarenes of formula (I) in which: R<1> represents a crown ether chain comprising at least two aryl or cycloalkyl rings; R<2> is a hydroxyl or alcoxy group, or both R<2> together form a crown ether chain like R<1>; and R<3> represents a hydrogen atom or an alkyl group. The calixarenes are used for the selective extraction of caesium from aqueous solutions, with particularly high concentration of sodium.