Even in neutral, aqueous solution, carbohydrates are deprotonated in the presence of appropriate metal ions. The particularly attractive structure of 1 (right; the lines represent diolato bridges and the circle the cyclodextrin torus) illustrates this principle, which has hitherto escaped attention most probably because the initial precipitates were mistaken for the metal hydroxides.
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Klüfers et al. (1994) studied this question.
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