Determine the D and L configuration for the c | vedclass

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Question

(A) To determine the $D$ or $L$ configuration of a carbohydrate in a Fischer projection,we look at the chiral center furthest from the carbonyl group

Vedclass · Accepted Answer

$L, L, D$

Vedclass · Answer

(A) To determine the $D$ or $L$ configuration of a carbohydrate in a Fischer projection,we look at the chiral center furthest from the carbonyl group (the lowest chiral carbon in the chain).If the $-OH$ group is on the right side,it is a $D$-sugar. If the $-OH$ group is on the left side,it is an $L$-sugar.For structure $(a)$:The lowest chiral center has the $-OH$ group on the left. Thus,it is $L$.For structure $(b)$:The lowest chiral center has the $-OH$ group on the left. Thus,it is $L$.For structure $(c)$:The lowest chiral center has the $-OH$ group on the right. Thus,it is $D$.Therefore,the configurations are $L, L, D$.

Determine the $D$ and $L$ configuration for the carbohydrates shown in the image.

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