Draw a structural formula of the RS configuration of the compound shown below. OH T CH NH-CH3 R `CH SI CH3 ephedrine • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Include H atoms at chiral centers only. • If a group is achiral, do not use wedged or hashed bonds on it.

Draw one of the possible diastereomers of the molecule shown below. Use a dash or wedge bond to indicate the stereochemistry of substituents on asymmetric centers, where applicable. Br છે

What is the relationship (same, enantiomers, or diastereomers) between the following two molecules? You should find the absolute configuration at the stereo center to answer this question. H CH... HS CH₂OH HOH₂C H SH

For the following molecules, draw all possible stereoisomers using line-angle formulas with wedge/dash notation. Label the stereocenters as R or S. Indicate which ones are enantiomers and which ones are diastereomers. (Remember: there are 2 stereoisomers possible for a molecule with n chiral centers) (A) (B) (C) (1 chiral center) Br OH (2 chiral centers) CI OH CH3 (3 chiral centers)