Organic solutions of poly-γ-(benzyl-l-glutamate)
(PBLG) generate a sufficient differential ordering effect
(DOE) to discriminate enantiomers using proton decoupled carbon-13 NMR
in natural abundance. Discrimination
between enantiomers is observed through the carbon-13 chemical shift
anisotropy (CSA) differences. This method
is successfully applied to a large number of chiral molecules including
a case of axial chirality and offers the advantage
that no labeling or chemical modification of molecules is needed.
In most cases, the chemical shift differences are
large enough to measure the enantiomeric excess with accuracy. We
show that this new tool is an attractive and
powerful alternative to the existing enantiomeric analytical
techniques.
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