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

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