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It was demonstrated that a novel [3]pseudorotaxane could be separated by column chromatography during the synthesis of a copillar[5]arene. Single crystal X-ray analysis revealed that this [3]pseudorotaxane consisted of the copillar[5]arene and its monomer in a molar ratio of 2 : 1.
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Gao et al. (2012) studied this question.
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