Molecular meccano. Part 33. Rotaxane or pseudorotaxane. That is the question!
Molecular meccano. Part 33. Rotaxane or pseudorotaxane. That is the question!, (P. R. Ashton, I. Baxter, M. C. T. Fyfe, F. M. Raymo, N. Spencer, J. F. Stoddart, A. J. P. White, and D. J. Williams), J. Am. Chem. Soc. 1998, 120, 2297-2307.