4.8 Article

Synthesis of Oxygen-Free [2]Rotaxanes: Recognition of Diarylguanidinium Ions by Tetraazacyclophanes

Journal

ORGANIC LETTERS
Volume 20, Issue 8, Pages 2416-2419

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.8b00757

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Funding

  1. Ministry of Science and Technology (Taiwan) [MOST-106-2628-M-002-002]
  2. National Taiwan University [NTU-106R880202]

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Simple cyclophanes containing four distant amino N atoms or ether O atoms behave as hosts for the threading of guest diarylguanidinium ions. The recognition system exhibits high synthetic flexibility, allowing unique O-free [2]rotaxanes to be synthesized efficiently (yields of up to 80%) through both threading-followed-by-stoppering and clipping approaches.

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