J. Buddrus et al., DETERMINATION OF THE ENANTIOMERIC RATIO OF ORGANIC AMMONIUM HALIDES OR ALKALI CARBOXYLATES BY NMR-SPECTROSCOPY, Analytical chemistry, 66(1), 1994, pp. 40-42
The enantiomeric ratio of chiral ammonium halides or alkali carboxylat
es can be determined by mixing the salt with an optically active carbo
xylate or ammonium halide, respectively (eq 1), and investigating the
diastereomeric associates by H-1- or C-13-NMR.