Multiple Choice
What is the common name of the sugar alcohol produced when D-galactose is reduced?
20. Carbohydrates
Reduction of Monosaccharides
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Draw the Fischer projection for the reduction product of D-mannose, the C-2 epimer of glucose. What is the structure and common name of the sugar alcohol produced?
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Verified step by step guidance1
Identify the structure of D-mannose, which is an aldohexose with the configuration: C-1 is an aldehyde, C-2 has the hydroxyl group on the left, C-3 has the hydroxyl group on the right, C-4 has the hydroxyl group on the right, C-5 has the hydroxyl group on the right, and C-6 is a primary alcohol (CH2OH).
Understand that the reduction of an aldose sugar like D-mannose involves the conversion of the aldehyde group at C-1 to a primary alcohol group.
Draw the Fischer projection for the reduction product of D-mannose. In this projection, the aldehyde group at C-1 is replaced by a CH2OH group, resulting in a sugar alcohol.
The resulting structure will have CH2OH groups at both C-1 and C-6, with the hydroxyl groups at C-2, C-3, C-4, and C-5 maintaining their original stereochemistry.
The common name for the sugar alcohol produced from the reduction of D-mannose is D-mannitol.
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