The syntheses of several bis-(1, 2-phenylenedioxydiscetamides) with eight binding sites (four ethers, four amides) are described. It had been anticipated that these bis-compounds would be much stronger binders for Group IIA cations than are members of our previously described 1, 2-phenylenedioxydiacetamide system, eg 1-3, which give isolable complexes usually of 2: 1 ligand/metal cation stoichiometry. Binding constants for the new diesters 4 ...
