(Solution) - a On the basis of the following sequence of reactions -(2025 Original AI-Free Solution)

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(a) On the basis of the following sequence of reactions, Emil Fischer was able to show that L-(-)-serine and L-(+)-alanine have the same configuration. Write Fischer projections for the intermediates A-C:

(b) The configuration of L-(+)-cysteine can be related to that of L-(-)-serine through the following reactions. Write Fischer projections for D and E:
(c) The configuration of L-(-)-asparagine can be related to that of L-(-)-serine in the following way. What is the structure of F?