Five additional macrocycles that allow Na+ ion-templated threading of guest units featuring a single urea or amide functionality.

@article{Lin2014FiveAM,
  title={Five additional macrocycles that allow Na+ ion-templated threading of guest units featuring a single urea or amide functionality.},
  author={You-Han Lin and Chien-Chen Lai and Sheng-Hsien Chiu},
  journal={Organic & biomolecular chemistry},
  year={2014},
  volume={12 18},
  pages={2907-17}
}
Five analogues of the macrocycle BPX26C6 are also capable of recognizing single urea and/or amide functionalities in the presence of templating Na(+) ions. We have unambiguously confirmed the formation of such [2]pseudorotaxane complexes in solution through syntheses of the corresponding [2]rotaxanes.