Amide derivatives of three optically active carboxylic acids,
N-(
S)-2-(4-chlorophenyl)isovaleroyl laurylamine [I],
N-(1
R, 3
R)-
trans-chrysanthemoyl laurylamine[II] and
N-(1
R, 3
S)-
cis-chrysanthemoyl laurylamine[III] were synthesized and their properties as stationary phases for the separation of chiral compounds by gas chromatography were examined. These phases showed enantioselectivity for some enantiomers of
N-trifluoroacetyl (TFA) amino acid esters,
N-TFA-amines and carboxylic acid amides. Rather high separation factors were obtained for some carboxylic acid amide enantiomers. For example, racemic 2-ethyl-3, 3-dimethylbutyric acid
t-butylamide was separated (α=1.037, 100 °C) with [I] and racemic
trans-chrysanthemic acid
t-butylamide was separated (α=1.074, 100 °C) with [II], respectively. It was noticeable that these two carboxylic acid amides were hardly separated with
N,
N',
N″-[2, 4, 6-(1, 3, 5-triazine) triyl]-tris-(L-valine isopropylester),
N,
N'-[2, 4-(6-ethoxy-1, 3, 5-triazine)diyl]-bis-(L-valyl-L-valine isopropylester),
N-lauroyl-L-valine
t-butylamide and
N-lauroyl-(
R)-1-(α-naphthyl)ethylamine, which were proved to be excellent chiral phases for the separation of amino acid and amine enantiomers. In conclusion these optically active carboxylic acid amides are specifically effective as the stationary phase for the separation of some chiral carboxylic acid amides.
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