Heteronuclear selective refocusing 2D NMR experiments for the spectral analysis of enantiomers in chiral oriented solvents |
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Authors: | Farjon Jonathan Baltaze Jean-Pierre Lesot Philippe Merlet Denis Courtieu Jacques |
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Institution: | Laboratoire de Chimie Structurale Organique, UMR CNRS 8074, Université Paris-Sud, ICMMO, Bat. 410, 91405 Orsay Cedex, France. |
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Abstract: | We report the use of carbon-proton heteronuclear selective refocusing 2D NMR experiments dedicated to the spectral analysis of enantiomers dissolved in weakly ordering chiral liquid crystalline solvents. The method permits the extraction of carbon-proton residual dipolar couplings for each enantiomer from a complex or unresolved proton-coupled 13C spectral patterns. Illustrative examples are analysed and discussed. It is shown that an accurate determination of enantiomeric excess is possible. |
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Keywords: | NMR 13C NMR chiral liquid crystal selective pulses enantiomeric excess |
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