Hemiacetal
Hemiacetal (pronunciation: /ˌhɛmiˈæsɪtəl/) is a functional group derived from aldehydes or ketones and alcohols. The term "hemiacetal" is derived from the Greek words "hemi," meaning half, and "acetal," a type of compound formed from an aldehyde and an alcohol.
Etymology
The term "hemiacetal" comes from the Greek "hemi," meaning half, and "acetal," a type of compound. This is because a hemiacetal is formed by the partial reaction of an aldehyde or ketone with an alcohol, hence the "half" acetal.
Formation
Hemiacetals are formed through the reaction of an aldehyde or a ketone with an alcohol in the presence of acid. This reaction results in the formation of a new hydroxyl group and a new alkoxy group on the same carbon atom.
Properties
Hemiacetals are generally unstable and readily convert back to the starting aldehyde or ketone and alcohol. However, in the presence of acid, they can be converted to full acetals, which are more stable.
Related Terms
See Also
External links
- Medical encyclopedia article on Hemiacetal
- Wikipedia's article - Hemiacetal
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