D-Pseudoephedrine, a decongestant that shrinks blood vessels in the nasal passages (treating stuffy nose), has the structure shown below.  1. What is the absolute configuration (R/S) of the carbon with – OH? 2. What is the absolute configuration (R/S) of the carbon with – CH3 3. Draw an enantiomer of this molecule: 4.  Draw a distereomer of this molecule

H- HO HO- HO OH H H OH H -H H CH₂OH Draw four different horizontal zig-zag bond line structures that correctly represent the Fischer projection of 2,3,4,5,6-pentahydroxyhexanal shown below. One of your bond-line structures should have the carbonyl on the left hand side of the molecule pointing up, another on the left side pointing down, another on the right side pointing up, another on the right side pointing down (the terminal CH₂OH is marked in blue) Also, assign each chirality center as (R) or (S) in the original Fischer projection (you only have to do this once as it's the same for all depictions of the molecule). H OH ОН. H H OH

13. Give the absolute configurations of the stereogenic carbons in the molecule below and draw the enantiomer of the molecule.

2. Assign priorities to the groups on this chiral carbon. Label it as R or S. QH HÖ ÓCH3

6. How many asymmetric centers does the compound shown below have? CH3 CI

Determine the configuration of each stereogenic center in the compound below. Highlight the carbon in red if the configuration is R, and in blue if the configuration is S. Br HO 0 3

Does the molecule below exist as a pair of enantiomers? If so, change the bonds to wedges and dashes to reflect R stereochemistry. If the molecule does not exist as a pair of enantiomers, check the box below. Does not exist as enantiomers Cl CH3 OR X

15 eBook Print References 3 attempts left Check my work Select the single best answer. Identify the relationship in the following pair. Do the drawings represent constitutional isomers or stereoisomers, or are they just different ways of drawing the same compound? If they are stereoisomers, are they enantiomers or diastereomers? (select) H CH3 -Br and H -CH3