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An acetal is a functional group with the following connectivity R 2 C(OR') 2, where both R' groups are organic fragments. The central carbon atom has four bonds to it, and is therefore saturated and has tetrahedral geometry.
is that hemiacetal is (chemistry) any of a class of compounds of general formula r 2 c(oh)or' (where r' is not h) while acetal is (organic chemistry) any diether of a geminal diol, r 2 c(or') 2 (where r' does not = h).Hemiacetal is a see also of acetal. As nouns the difference between hemiacetal and acetal.s that hemiacetal is (chemistry) any of a class of compounds of general formula r 2 c(oh)or' (where r' is not h) while acetal is (organic chemistry) any diether of a geminal diol, r 2 c(or') 2 (where r' does not = h).