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Question

Aldopentoses named as ribose and 2deoxyribose are found in nucleic acids. What is their relative configuration?

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Solution

Aldopentoses like Ribose and
2Deoxyribose are the sugar moieties in nucleic acids like RNA and DNA respectively. As in cyclic structure to find the relative configuration we see the configuration of OH group at last chiral centre (Here C3).

If the OH group is in the downward direction then it is Dconfiguration and if the OH group is in the upward direction then it is L configuration.

The structures of these sugars are given below:


The configuration of both the Aldopentoses is
Dconfiguration and are named as βDribose and βD2deoxyribose.

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