Porphyrin Blocking Groups in Amide‐Based Rotaxanes

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Abstract
The synthesis of amide‐based symmetrical rotaxanes2a,bbearing porphyrin blocking groups is firstly described. These compounds can be obtained by a one‐step one‐pot reaction only if the macromonocyclic host template complementary to the threading guest is found. The symmetry of the axle is removed by introducing an unsymmetrical central part, leading to the formation of rotaxane2c. Different blocking groups were used to obtain the non‐symmetrical rotaxane3a. The bis‐Zn2+complex10aof the rotaxane2awas isolated. A nonionic supramolecular complex7was assumed as threaded intermediate, which was blocked by reaction with the stopper components. The amide‐type rotaxane system thus proved to be variable with respect to all its parts including stopper components of different reactivity, bulkiness and supramolecular functionality.

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