We report a quantitative synthetic strategy of a [1]rotaxane from a representative pseudo[1]rotaxane. The structure of the [1]rotaxane was characterized by H NMR,C NMR, 2D NMR, mass spectroscopy, and melting point, and its optimized geometry in CHCl by theoretical calculation at the B3LYP/6-31G(D) level using the PCM model matched well with 2D NOESY. This [1]rotaxane proves to be a good catalyst for the Knoevenagel reaction in CHCl, which follows second order kinetics.

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In this work, we designed a new pillar[5]arene-based molecular machine responsive to the polarity of different solvents, which can exist in an interlocked structure in CDCl3 and CD3OD, and can exist in an extended form in DMSO and was studied by 1H and 2D NMR spectroscopy, HR(MS) and fluorescence spectroscopy.