Several imidazolinium salts are synthesized from (L)-valine. A study of the structure relationships is achieved to obtain high diastereomeric interactions with an anionic substrate. High splitting up to 60 Hz of the (rac)-potassium Mosher's salt are observed by NMR spectroscopy.
Recognition. -Several imidazolium salts are synthesized from (L)-valine. It is found that the choice of counter anion is crucial for the properties of the salt. For example, NTf2 anion leads to room temperature ionic liquids, while the PF6 anion only gives solid salts. -(CLAVIER, H.; BOULANGER, L.; AUDIC, N.; TOUPET, L.; MAUDUIT*, M.; GUILLEMIN*, J.-C.; Chem. Commun. (Cambridge) 2004, 10, 1224-1225; Inst. Chim., CNRS, Univ. Rennes, F-35042 Rennes, Fr.; Eng.) -M. Paetzel 40-128
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