Reduction of D -glucose leads to an optically active alditol (D-glucitol), whereas reduction of

step 1 Okay, so for problem 17, okay, we have de -gloose and de -galactose, and we're reducing both of

Reduction of D -glucose leads to an optically active alditol...

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Key Concepts

Aldose Reduction

This concept refers to the chemical transformation where a carbonyl group (found in aldoses) is reduced to a hydroxyl group, producing an alditol. In the context of sugars, the reduction converts the aldehyde group into an additional chiral center, which sets up the possibility for various stereoisomers depending on the configuration of the other hydroxyl groups present in the molecule.

Optical Activity and Chirality

Optical activity arises in chiral molecules, which are non-superimposable on their mirror images, and is observed by the rotation of plane-polarized light. For sugars and their reduced alditols, the specific spatial arrangement of hydroxyl groups determines the chirality. A molecule that maintains chirality after chemical reactions, such as reduction, will typically be optically active.

Meso Compounds

Meso compounds are molecules that contain multiple stereocenters but possess an internal plane of symmetry, rendering them achiral and therefore optically inactive. In the context of sugar reduction, if the arrangement of substituents creates a mirror image within the same molecule, even though several asymmetric centers exist, the overall compound does not rotate plane-polarized light. This phenomenon explains why the reduction of certain sugars (like D-galactose) can lead to optically inactive alditols.

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