Chapter 5: Q40E (page 148)
What are the stereochemical configurations of the two diastereomers of(2S,4R)-2,4-octanediol? (A diol is a compound with two-OH groups.)
Short Answer

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Chapter 5: Q40E (page 148)
What are the stereochemical configurations of the two diastereomers of(2S,4R)-2,4-octanediol? (A diol is a compound with two-OH groups.)

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Draw the meso form of each of the following molecules, and indicate the plane of symmetry in each:
(a)

(b)

(c)

What is the relationship between the specific rotations of (2R,3R)-dichloropentane and (2S,3S)-dichloropentane? Between (2R,3S)-dichloropentane and (2R,3R)-dichloropentane?
Draw both cis- and trans-1,3-dimethyl cyclohexane in their more stable chair conformations.
(a) How many stereoisomers are there of cis-1,3-dimethyl cyclohexane, and how many of trans-1,3-dimethyl cyclohexane?
(b) Are any of the structures chiral?
(c) What are the stereochemical relationships among the various stereoisomers of 1,3-dimethyl cyclohexane?
Assign R or S configuration to each chirality center in pseudoephedrine, an over-the-counter decongestant found in cold remedies (blue = N)
Ribose, an essential part of ribonucleic acid (RNA), has the following structure:

(a) How many chirality centers does ribose have? Identify them.
(b) How many stereoisomers of ribose are there?
(c) Draw the structure of the enantiomer of ribose.
(d) Draw the structure of a diastereomer of ribose.
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