13. Below are four representations of stereoisomers of ephedrine a sympathomimet

Question

13. Below are four representations of stereoisomers of ephedrine a sympathomimetic amine commonly used as a stimulant, appetite suppressant, concentration aid, and decongestant. It is also used in the illicit manufacturing of methamphetamine Assign R- and S- configurations at each chiral center. Also, define their stereochemical relationships as enantiomers, diastereomers, or identical compounds (Note: CeHs is a phenyl ring). (36 pts) ai center. Also, define their stereochermical relationships as NH2 OH H CH3 H C8H5 H3C OH OH NH2 CH3 OH C6H5 CeH5 Molecule A and B are: Molecule A and C are: Molecule A and D are: Molecule B and C are: Molecule B and D are: Molecule C and D are:

Explanation / Answer

configations in the Molecules ---- A ----> R and R

B ----> R and S

C ----> R and S

D -----> S and S

A and B are Diastereomers

A and C are Diastereomers

A and D are Enantiomers

B and C are Idetical

B and D are Diastereomers

C and D are Diastereomes

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