1-(+)-Dehydroabietylimidazolium Salts as Enantiomer Discriminators for NMR Spectroscopy
H. Q. Nimal Gunaratne A , Tiina Laaksonen B , Kenneth R. Seddon A and Kristiina Wähälä B C DA QUILL Research Centre, School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, Northern Ireland, UK.
B Department of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, PO Box 55, FI-00014 University of Helsinki, Finland.
C Medicum, PO Box 21, FI-000140 University of Helsinki, Finland.
D Corresponding author. Email: kristiina.wahala@helsinki.fi
Australian Journal of Chemistry 70(7) 845-856 https://doi.org/10.1071/CH16545
Submitted: 27 September 2016 Accepted: 3 February 2017 Published: 8 March 2017
Abstract
Nine new (+)-dehydroabietylimidazolium salts were synthesised and studied as chiral solvating agents for several different racemic aromatic and non-aromatic carboxylate salts. These cationic chiral solvating agents resolve racemic ionic analytes better than non-ionic ones. Bis(dehydroabietylimidazolium) bis(trifluoromethanesulfonimide) gave the best discrimination for the enantiomers of carboxylate salts. Its resolution behaviour was studied by an NMR titration experiment, which indicated 1 : 1 complexation with the racemic analyte. The dehydroabietylimidazolium salts were also useful in enantiomeric excess (ee) determinations, and for the recognition of chirality of racemic aromatic and non-aromatic α-substituted carboxylic acids.
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