Abstract
Four new derivatives of p-t-butylcalix[4]arene containing two (1,3-distal) chiral unsymmetrical urea moieties at the lower rim were synthesised in four steps. Their anion recognition properties toward MeCO2−, H2PO4−, NO3−, I−, Br−, Cl− were assessed by UV-Vis titration spectroscopy. All the receptors showed the strongest recognition ability for MeCO2−, one of them having an association constant of 3139 M-1. 1H NMR studies of this receptor complex confirmed its tight binding of MeCO2−.
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