Simplification of the 1H NMR spectra of enantiomers dissolved in chiral liquid crystals, combining variable angle sample spinning and selective refocusing experiments.
This work presents a technique to simplify overcrowded proton spectra in chiral liquid crystal solvents using rotation of the sample near the magic angle, VASS, combined with homonuclear selective refocusing 2D NMR experiments, SERF. This methodology provides a powerful tool to visualise enantiomers out of unresolved proton spectra. A modified SERF sequence is presented where the resulting 2D spectrum can be phased to increase the resolution. Accurate enantiomeric excesses are determined that are not possible to measure on static samples. Two examples are presented.
Beguin
Laetitia
L
Laboratoire de RMN en milieu orienté, Univ. Paris-Sud XI, ICMMO, UMR 8182 CNRS, 91405, Orsay Cedex, France.
Courtieu
Jacques
J
Ziani
Latifa
L
Merlet
Denis
D