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A macrocyclic receptor shaped by two xanthone units bonded to binaphthyl is able to extract zwitterionic amino acids enantioselectively from water to chloroform in the presence of 18-crown-6 ether. Based on 1 H NMR and circular dichroism spectra, the most stable associate of receptor 1 with alanine is assigned to the (M,S) configuration while the opposite configuration in phenylglycine yields...
Hydrogen-bonding receptors for carboxylic acids have been prepared based on a cis tetrahydrobenzoxanthene skeleton. X-ray diffraction study of one of these compounds revealed that the cleft is suitable for establishing strong linear hydrogen bonds with the oxygen of a water molecule. Complexes that set only three H-bonds with the guests showed no chiral recognition with amino acid derivatives. However,...
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