It could hardly be easier! The enantiomeric ratio of unprotected natural as well as artifical amino acids can be determined by 1H NMR spectroscopy with an accuracy of ± 1% in aqueous solution after coordination to a C2-chiral palladium complex [Eq. (a); R = Me, Ph; RR = (CH2)4].
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Staubach et al. (1996) studied this question.
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