A molecular cage based [2]rotaxane is reported in which the linear thread component can be elongated and contracted in a stepwise manner, mimicking a two-stage retractable cable that can be operated in both push-button (free-selection) and rotary (continuous-change) modes, depending on the choice of reagents.

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http://dx.doi.org/10.1002/chem.201202820DOI Listing

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