Journal
ORGANIC LETTERS
Volume 13, Issue 10, Pages 2650-2653Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol200753c
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The first examples of rotaxanes based on calixarenes threaded by dialkylammonium ions, which also represent the first examples of calixarene-based molecular shuttles, are reported. The base/acid treatment demonstrated that these systems act as molecular shuttles, which move between three sites on the axle. When small OMe groups are appended at the calix[6]arene lower rim an unprecedented inversion of its shuttling direction is observed, which occurs through a cone-to-cone inversion of the macrocycle.
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