Recent Advances in the Synthesis of Ammonium-Based Rotaxanes

Molecules

Dominic Thibeault¹ 

[1] Département de Chimie, Centre de Recherche sur les Matériaux Avancés (CERMA), 1045 Ave. de la Médecine, Université Laval, Québec, G1V 0A6, Canada

关键词: rotaxane;    crown ether;    synthesis;    end-capping reaction;    ring-closing reaction;    functional rotaxane;   

DOI  :  10.3390/molecules15053709

来源: mdpi

【 摘 要 】

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•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.

【 授权许可】

CC BY   
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.