Dicationic cyclodextrins with AC regioisomer structure were prepared by monosubstitution of 6A-azido-β-cyclodextrin with 2-mesitylenesulfonyl chloride and the Staudinger reaction. One family of the desired cyclodextrins, the 6A-ammonium-6C-butylimidazolium-β-cyclodextrin chlorides, demonstrated a good chiral recognition ability towards both acidic and even neutral racemates even at concentrations as low as 0.5 mM.
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Dai et al. (2012) studied this question.
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