Cyclic hemiacetals often form readily, especially when they are 5- and 6-membered rings. In this case, a hydroxy group reacts with a carbonyl group within the same molecule to undergo an intramolecular cyclization reaction.

Hemiacetals in nature

Hemiacetals commonly exist in nature as aldoses such as glucose, and hemiketals commonly exist in nature as ketoses such as fructose.

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