Concept explainers
(a)
Interpretation:
The structure of an L- aldopentose needs to be drawn.
Concept introduction:
Sugar molecules can be named as D or L sugars according to their most oxidized carbon at the top of the Fisher projection. Aldopentose is a five-carbon
Answer to Problem 20.27P
Explanation of Solution
Sugar molecules can be named as D or L sugars according to their most oxidized carbon at the top of the Fisher projection. The absolute configuration of a molecule can be explained using D and L configuration. In D- sugars, the OH group on the bottom chiral center points to the right while in L- sugars, the OH group on the bottom chiral center points to the left. Aldopentose is a five-carbon aldehyde sugar. Xylose, Arabinose and Ribose are few examples.
(b)
Interpretation:
The structure of a D- tetrose needs to be drawn.
Concept introduction:
Sugar molecules can name as D or L sugars according to their most oxidized carbon at the top of the Fisher projection. Aldotetrose is a four-carbon aldehyde sugar.
Answer to Problem 20.27P
Explanation of Solution
Sugar molecules can be named as D or L sugars according to their most oxidized carbon at the top of the Fisher projection. The absolute configuration of a molecule can be explained using D and L configuration. In D- sugars, the OH group on the bottom chiral center points to the right while if L-sugars, the OH group on the bottom chiral center points to the left. Aldotetrose is a four-carbon aldehyde sugar.
(c)
Interpretation:
The structure of a five-carbon alditol needs to be drawn.
Concept introduction:
Alditols are polyols. Alditols can be produced by reducing an aldehyde or a
Answer to Problem 20.27P
Explanation of Solution
Alditols are polyols. Alditols can be produced by reducing an aldehyde or a ketone group in a monosaccharide. In this reduction process, an aldehyde group or a ketone group converts into −CH2OH group. Xylitol is an example of an alditol.
For an example:
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Chapter 20 Solutions
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