A ketal is a compound that has the following general structural formula.
- R1 = alkyl, aryl
- R2 = alkyl, aryl
- R3, R4 = alkyl (In most ketals, R3 = R4; cyclic ketals are an exception.)
The functional group 1 in an organic molecule is called the ketal group; the carbon atom bearing the two oxygen atoms is the ketal carbon.
see also cyclic ketal