Is gentiobiose a reducing sugar? Does it mutarotate? Explain your reasoning.
Here, we are going to explain about the mutarotation of gentiobiose.
Mutarotation is defined as the change in the optical rotation because of the change in the equilibrium between two anomers, when the corresponding stereocenters interconvert.
Cyclic sugars show mutarotation as α and β anomeric forms interconvert. Gentiobiose is an hemiacetal in water which is in equilibrium with the open chain form.
Thus, Gentiobiose undergoes mutarotation.
Textbook: Organic Chemistry
Author: L.G. Wade Jr
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