4 years ago

Na+ Ions Induce the Pirouetting Motion and Catalytic Activity of [2]Rotaxanes

Na+ Ions Induce the Pirouetting Motion and Catalytic Activity of [2]Rotaxanes
Sheng-Hsien Chiu, Shie-Ming Peng, Chien-Chen Lai, Richard P. Cheng, Yong-Jay Lee, Kuang-Shun Liu, Yi-Hung Liu
We have prepared [2]rotaxanes, the behavior of which as switchable catalysts depends on their pirouetting motion, which can be controlled through the addition and removal of Na+ ions. At least three sequential on/off cycles of a Michael reaction can be performed in situ when using the NaTFPB/[2.2.2]cryptand reagent pair to switch “on” and “off” the catalytic ability of the [2]rotaxanes. Two-way street: The catalytic activity of the [2]rotaxane catalysts can be switched between “on” and “off” states over at least three different cycles through in situ addition and removal of Na+ ions.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/chem.201702525

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