1.
Org Lett
; 13(18): 4838-41, 2011 Sep 16.
Artigo
em Inglês
| MEDLINE
| ID: mdl-21846084
RESUMO
Two amide [2]rotaxanes were synthesized in high yields using a novel N,N'-dipropargyl diketopiperazine axle centerpiece as the template to which the stoppers are attached through "click chemistry". (1)H and 2D NMR spectra provide evidence for two different H-bonding motifs, in one of which the triazole CH groups form C-H···OâC bonds with the wheel carbonyl O atoms. This motif can be controlled and switched reversibly by competitive anion binding.