145839-40-3Relevant articles and documents
CH???O hydrogen bonds in "clicked" diketopiperazine-based amide rotaxanes
Dzyuba, Egor V.,Kaufmann, Lena,Loew, Nora L.,Meyer, Annika K.,Winkler, Henrik D. F.,Rissanen, Kari,Schalley, Christoph A.
supporting information; experimental part, p. 4838 - 4841 (2011/11/13)
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". 1H and 2D NMR spectra provide evidence for two different H-bonding motifs, in one of which the triazole CH groups form C-H???O=C bonds with the wheel carbonyl O atoms. This motif can be controlled and switched reversibly by competitive anion binding.