fig6

Figure 6. (A) Synthesis of S-C7³⁺·3Br^- and R-C7³⁺·3Br^-; (B) CD spectra of S-C7³⁺·3Br^-, R-C7³⁺·3Br^-, and the unseparated racemic mixture; (C) partial ¹H NMR spectra of a mixture of S-C7³⁺·3NO₃^-, host-guest complexes and rac-1,2-epoxybutane; and (D) host-guest chemistry of S-C7³⁺ in D₂O. CD: Circular dichroism; NMR: nuclear magnetic resonance.