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Beilstein J. Org. Chem. 2018, 14, 2074–2081, doi:10.3762/bjoc.14.181
Graphical Abstract
Scheme 1: Chemical structures and acid-base stimuli responsiveness of target [2]rotaxane R1 and deprotonated ...
Scheme 2: Syntheses of key intermediates 5, 8 and target [2]rotaxane R1.
Figure 1: Partial 1H NMR spectra (400 MHz, CDCl3, 298 K). (a) Compound 5, (b) target [2]rotaxane R1, (c) azid...
Figure 2: Partial 1H NMR spectra (400 MHz, CDCl3, 298 K). (a) [2]Rotaxane R1, (b) deprotonation by the additi...
Figure 3: Partial 2D ROESY NMR spectra (500 MHz, CDCl3, 298 K). (a) [2]Rotaxane R1, (b) deprotonation with ad...