Switching and extension of a [c2]daisy-chain dimer polymer

被引：0
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作者：
Clark, Paul G. [1 ]
Day, Michael W. [1 ]
Grubbs, Robert H. [1 ]
机构：
[1] Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, United States
来源：
Journal of the American Chemical Society | 2009年 / 131卷 / 38期
关键词：
(Chemical Equation Presented) We report the synthesis of a [c2]daisy-chain dimer via ruthenium-catalyzed ring-closing olefin metathesis. Confirmation of the interlocked nature of the structure was achieved through single-crystal X-ray diffraction analysis. The dimer could be readily switched from the bound to the unbound conformation by treatment with 3.0 equiv of KOH and subsequently reprotonated by treatment with 3.0 equiv of HPF6. Azide functionalization of the dimer enabled incorporation in linear step-growth polymer chains using the alkyne-azide click reaction. Gel permeation chromatography coupled with multiangle laser light scattering analysis showed the polymers contained 22 dimers and had a radius of gyration of 14.8 nm. Acylation of the amines of the dimers sterically forced elongation of the interlocked units; and MALLS analysis of the polymer showed a 48% increase in the Rg (21.4 nm). © 2009 American Chemical Society;
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Journal article (JA)
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页码：13631 / 13633
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