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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.
The linkage or bond in the center that links the two glucose units is referred to as a glycosidic bond or glycosidic linkage. A compound that contains a carbon bonded to two oxygens, both of which are bonded to additional oxygens are sometimes referred to as an acetal.