Folding of Long-Chain Alkanediammonium Ions Promoted by a Cucurbituril Derivative

We report the isolation and characterization of two top−bottom differentiated CB[<i>n</i>]-type receptors, namely <i>ns</i>-CB[6] and cucurbituril derivative <b>2</b>, which display diastereoselective recognition toward unsymmetrical guests. Compound <b>2</b> also promotes the back-folding of long chain alkanediammonium ions in water.