Illustrated Glossary of Organic Chemistry

Ketal: The acetal of a ketone. A contraction of ketone and acetal. Although useful to differentiate an aldehyde acetal from a ketone acetal, 'ketal' has fallen out of use.


A generalized scheme illustrating the relationship between a ketone and the corresponding ketal.


Cyclic ketal
A cyclic ketal of acetophenone can be synthesized by reaction of acetophenone with ethylene glycol (HOCH2CH2OH) and p-toluenesulfonic acid (TsOH) catalysis.