A structure with two alkoxy groups attached to the same saturated carbon. Acetal hydrolysis restores a carbonyl compound.
The cyclic trimer of formaldehyde, . Acid-catalysed acetal cleavage can regenerate formaldehyde, which is strongly hydrated in water.
An acetal derived formally from a ketone, with two carbon substituents and two oxygen substituents at its acetal carbon.
An acetal formed with benzaldehyde, containing a Ph–CH unit attached to two oxygens. It can protect a diol and is acid-labile.
A cyclic sugar-derived acetal analogue with an anomeric carbon–sulfur bond. Its anomeric configuration and conformational preference must be distinguished from one another.
2,2-Dimethoxypropane is the dimethyl acetal of acetone. Reaction with a diol under acid catalysis can form an acetonide and two methanol molecules.
An acetonide is an isopropylidene acetal formed from a diol and acetone or an acetone equivalent. Formation of its O–CMe2 bonds leaves the original stereogenic carbon–oxygen bonds intact.

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