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Aldopentoses ...

Question

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

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Solution

Aldopentoses like Ribose and
$2 - D e o x y r i b o s e$ are the sugar moieties in nucleic acids like $R N A$ and $D N A$ respectively. As in cyclic structure to find the relative configuration we see the configuration of $- O H$ group at last chiral centre (Here $C 3$ ).

If the $- O H$ group is in the downward direction then it is $D -$ configuration and if the $- O H$ 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
$D -$ configuration and are named as $β - D -$ ribose and $β - D - 2 -$ deoxyribose.

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