Azo coupling between 2,6-dimethylphenol and aqueous 4,4′-bis(diazonio)azobenzene chloride in the presence of α-cyclodextrin yields an azo dye [3]rotaxane as a single stereoisomer, with the 2,3-rims of both cyclodextrins pointing outwards.
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Craig et al. (1999) studied this question.
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