Abstract 1-Phenylethylenedinitrilo-N,N,N′,N′-tetraacetic acid and dl-1,2-diphenylethylenedinitrilo-N,N,N′,N′-tetraacetic acid have been synthesized by the carboxymethylation of the corresponding phenyl-substituted ethylenediamines. The chelate stability constants of the two ligands have been determined potentiometrically for alkaline earth and selected transition metal ions. The increase in the chelate stability as compared with EDTA was interpreted in terms of the steric effect of phenyl substitutions.
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Ôkaku et al. (1967) studied this question.
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