Fig. 6. Controlled disassembly and assembly of the dimer 5·5 by a reversible chemical modification. Partial spectra (600 MHz, CDCl3, 298 K) of: (a) thread Cp-1; (b) bromo-derived rotaxane Cp-2; (c) rotaxane Cp-5. Reaction conditions: (i) cyclopentadiene, DMSO, 80 °C, 16 h, 48%; (ii) 235 °C, 0.5 mm Hg, 30 min, ∼41%. Signals related to the Diels–Alder adduct are coloured in orange (for clarity, only one diastereoisomer is drawn). Signals related to the GlyGly station are coloured in green. Signals related to the diamide macrocycle are coloured in purple. Signals related to the tetraamide macrocycle are coloured in light blue.
