Concept explainers
(a)
Interpretation:
The enantiomer of the given monosaccharide has to be drawn and D or L-sugar has to be identified from the pair.
Concept introduction:
The pair of Enantiomers is non-superimposable mirror images of each other.
The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).
The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon (bottom) from the carbonyl group. Such as,
If the –OH group is located in right side then, the carbohydrate is a D-sugar.
If the –OH group is located in left side then, the carbohydrate is an L-sugar.
(b)
Interpretation:
The enantiomer of the given monosaccharide has to be drawn and D or L-sugar has to be identified from the pair.
Concept introduction:
The pair of Enantiomers is non-superimposable mirror images of each other.
The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).
The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon (bottom) from the carbonyl group. Such as,
If the –OH group is located in right side then, the carbohydrate is a D-sugar.
If the –OH group is located in left side then, the carbohydrate is an L-sugar.
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Fundamentals of General, Organic, and Biological Chemistry (8th Edition)
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