cations, for example by exposing these to an anion with a known basicity and using NMR to gauge whether deprotonation occurs or not. Such an experiment was performed with DiPh. Figure S4.20. Comparison of 13C NMR spectra for 1,3-dialkyl substituted imidazolium cations (left) with those of 4,5substituted imidazolium cations recorded in CD3CN. NTf2 was the common counter anions used in all measurements.
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