Abstract
a stepwise synthesis of three macrocyclic tetralactams selective complexants of Ca 2+ vs. alkali and Mg 2+ ions is reported. The multiplicity of the resonances in 13C and 19F n.m.r. spectroscopy is related to the restricted rotations around the carbon-nitrogen bond of the four amide moieties. The 1/1 complexes formed by addition of one equivalent of Ca(ClO 4) 2 exhibit very simple spectra which are assigned to the existence of a single form in the complex with the carbonyl oxygen atoms in the same orientation.
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