Question

Draw the Fischer projection formula of D-glyceraldehyde. Explain the positions of different groups in the molecule. How are the higher sugars assigned configuration on the basis of Fischer projection formula?

25 Jan 2018
Answer :
Word Count : 573

Image ignouacademy-com--p-formula-61413

Four Carbon Aldehyde Sugars (Aldotetroses)

Once the absolute configurations of L- and D- glyceraldehyde were proposed, the absolute configurations of other chiral compounds could then be established by analogy (and a lot of chemical grunt work).

It’s not crucial for today, but for an example of this kind of reasoning, see this [Note].  [We will revisit it when we write about the Fischer Proof for the structure of glucose.]

Back when the concept of chiral centers was being introduced, you likely learned that a molecule with n chiral centers will have 2n stereoisomers (as long as there are no meso compounds).

There are two four-carbon aldoses, throse and erythrose. They each have two chiral centers.  Each exist as a pair of enantiomers (L- and D- ) giving four stereoisomers in total.

Here they are.  The important thing to

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