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?
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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