The first stereospecific chemical synthesis of a sample of the amino acid (2S)-leucine labelled in one of the diastereotopic methyl groups has been achieved using (2S)-pyroglutamic acid as a chiral template. This has been used to develop a method for assigning resonances to the diastereotopic methyl groups of the leucine residues in the 1H NMR spectra of proteins.
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August et al. (1996) studied this question.