期刊
MOLECULES
卷 15, 期 5, 页码 3709-3730出版社
MDPI AG
DOI: 10.3390/molecules15053709
关键词
rotaxane; crown ether; synthesis; end-capping reaction; ring-closing reaction; functional rotaxane
资金
- Fond de Recherche sur la Nature et les Technologies (FQRNT)
- le Centre Quebecois sur les Materiaux Fonctionnels (CQMF)
The number of synthetic methods enabling the preparation of ammonium-based rotaxanes has increased very rapidly in the past ten years. The challenge in the synthesis of rotaxanes results from the rather weak interactions between the ammonium-containing rod and the crown ether macrocycle in the pseudorotaxane structure that rely mostly on O center dot H hydrogen bonds. Indeed, no strong base or polar solvent that could break up H-bonding can be used during the formation of rotaxanes because the two components will separate as two distinct entities. Moreover, most of the reactions have to be performed at room temperature to favor the formation of pseudorotaxane in solution. These non-trivial prerequisites have been taken into account to develop efficient reaction conditions for the preparation of rotaxanes and those are described in detail along this review.
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