Acetal Definition:

(Sect. 20.5): A functional group characterized by two alkoxy (OR) groups connected to the same carbon atom. Acetals can be used as protecting groups for aldehydes or ketones.

Acetal Explained:

An acetal group involves two “OR” groups attached to the same carbon. The diagram below depicts the functional groups:

Acetal groups usually form when alcohol attacks an aldehyde or ketone (See “Acetal Formation” mechanism). Compounds such as Sulfuric Acid and p- toluenesulfonic acid are example products formed from an acetal reaction.

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