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Simplification of the 1H NMR spectra of enantiomers dissolved in chiral liquid crystals, combining variable angle sample spinning and selective refocusing experiments.

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      Abstract

      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.

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      Affiliations
      [1 ] Laboratoire de RMN en milieu orienté, Univ. Paris-Sud XI, ICMMO, UMR 8182 CNRS, 91405, Orsay Cedex, France.
      Journal
      Magn Reson Chem
      Magnetic resonance in chemistry : MRC
      0749-1581
      0749-1581
      Dec 2006
      : 44
      : 12
      10.1002/mrc.1905 16991108
      Copyright 2006 John Wiley & Sons, Ltd.

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