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Mobile App Chapter 28: Question 28.11 (page 1106)
Question: Referring to Figure 28.5, which d-ketohexoses have the S configuration at C3?
Fig. 28.5
Short Answer
Answer
All the d-ketohexoses have the R configuration.
Step by step solution
d-Ketohexoses
Any monosaccharide that has six carbon atoms with a ketone functional group with three chiral centers that rotate is known as a d-ketohexose. Examples of d-ketohexoses include fructose, psicose, sorbose, and tagatose
Identifying configuration
Among the given d-ketohexoses, the C3 carbon atom is a chiral center. The Fischer projections are converted to the wedge and dash structures as follows.
From the wedge-dash structures, all the d-ketohexoses have the R configuration.
Wedge-dash structures of the given ketohexoses
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