hem·i·ac·e·tal (h m  - s  -tl)n. Any of a class of compounds containing an alkyl group, especially when formed as intermediates during the preparation of acetals from aldehydes or ketones. |
hemiacetal
formed by nucleophilic addition of an alcohol to the carbonyl group of an aldehyde. Most open-chain hemiacetals are not stable, but cyclic hemiacetals of the type present in aldehyde sugars such as glucose are more stable.
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