The complexation of cations by lipophilic cyclodextrins opens new preparative possibilities. This was shown in the first synthesis of a [2]-rotaxane with participation of cyclodextrin. A bipyridinium unit quaternized on one side was complexed by heptakis(3-O-acetyl-2,6-di-O-butyl)-β-cyclo-dextrin and then quaternized at the second N atom. The rotaxane, here shown schematically, was unequivocally identified by mass spectrometry and NMR spectroscopy.
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Wenz et al. (1992) studied this question.
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