Semirotaxanes and unsymmetrical rotaxanes from substituted benzylammonium salts and dibenzo-24-crown-8
ARKIVOC(2021)
摘要
Y Three new hydroxyl-functionalized secondary benzyl ammonium salts were synthesized and complexed with dibenzo-24-crown-8. Three [2]semirotaxanes and then their two [2]rotaxanes each with two different stoppers were prepared successfully by reactions of the hydroxyl groups with bulky reagents. X-ray analysis of a single crystal of a [2]semirotaxane confirmed its structure. The formation of the [2]semirotaxanes can be reversibly controlled by adding KPF6 and 18-crown-6 sequentially. These new unsymmetrical [2]rotaxanes afford a way to prepare planar chiral rotaxanes and related supramolecular systems. [GRAPHICS]
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关键词
Semirotaxane,rotaxane,self-assembly,supramolecular chemistry
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