The aldehyde of glucose can tautomerize to an enol. The ketone
in fructose can tautomerize to the same enol. This enol can return
to either keto form under the conditions promoting
tautomerization.
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An enol is an organic compound containing a hydroxyl group
bonded to a carbon atom, doubly bonded to another carbon atom.
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An acetylacetonate is a salt of the enol form of
acetylacetone.