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Diholosides

Diholosides are condensates of two cyclic holosides:

Maltose

α-D-Glucose(1→4)α-D-Glucose

Is reducing because a reopening of the cycle is possible in right position 1 to restore a reducing aldehyde function!

Cellobiose

β-D-Glucose(1→4)β-D-Glucose

Is reducing because a reopening of the cycle is possible in right position 1 to restore a reducing aldehyde function!

Lactose

β-D-Galactose(1→4)α-D-Glucose

Is reducing because a reopening of the cycle is possible in right position 1 to restore a reducing aldehyde function!

Sucrose (saccharose)

α-D-Glucose(1→2)β-D-Fructose

It is not reducing, because the 1→2 bond blocks the two possible carbonyl positions!