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Enantiomers of N-trifluoroacetyl-amino acid methyl esters in CC1 4  solution, after addition of the chiral polysiloxane (L)-Chirasil-Val, display a chemical shift nonequivalence ΔΔδ in both  1 H NMR and  19 F NMR spectroscopy. The effects found for the leucine and valine derivatives can be correlated with the thermodynamic parameters of interaction in the undiluted system, as determined by gas chromatography. In CDC1 3  solution, no peak splitting was observed. The method is potentially useful for the determination of the enantiomeric purity of substrates of low volatility.

Chemical Shift Nonequivalence of Enantiomers of Amino Acid Derivatives in 1 H NMR and 19 F NMR Spectroscopy Induced by L-Chirasil- Val.