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About turn: The preferred helical sense of the complex formed between glucose and the meta-ethynylpyridine polymer in aqueous methanol is inverted by mutarotation (see picture). The strong circular dichroism effects induced by pure α- and β-D-glucose weakened with time because the diastereomer excess decreased through mutarotation. The transition curve of the ellipticity closely reflected that of the anomer ratio.
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Waki et al. (2007) studied this question.
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