Chapter 10.2, Problem 4P

Q1: The shrub ma huang contains two biologically active stereoisomers ephedrine and pseudoephedrine-with two stereogenic centers as shown in the given structure. Ephedrine is one component of a once popular combination drug used by body builders to increase energy and alertness, while pseudoephedrine is a nasal decongestant. a. Draw the structure of naturally occurring (-)-ephedrine, which has the 1R, 25 configuration. b. Draw the structure of naturally occurring (+)- pseudoephedrine, which has the 15,25 configuration. c. How are ephedrine and pseudoephedrine related? N, d. Draw all other stereoisomers of (-)-ephedrine and (+)-pseudoephedrine and give the R,S designation for all stereogenic centers. OH Ephedrine 15 2.5

Certain omega-3 fatty acids can be found only in animal sources, such as fatty fish. Two of these are eicosapentaenoic acid (EPA) [20:5] and docosahexaenoic acid (DHA) [22:6], both of which are ω-3 fatty acids. DHA has been shown to be important in healthy brain development, so it has recently been added to infant formulas. Breast milk is rich in DHA as long as the mother maintains a healthy diet that includes fish. Draw skeletal structures of the fatty acids EPA and DHA.

Q1: The shrub ma huang contains two biologically active stereoisomers ephedrine and pseudoephedrine-with two stereogenic centers as shown in the given structure. Ephedrine is one component of a once popular combination drug used by body builders to increase energy and alertness, while pseudoephedrine is a nasal decongestant. a. Draw the structure of naturally occurring (-)-ephedrine, which has the 1R, 25 configuration. b. Draw the structure of naturally occurring (+)- pseudoephedrine, which has the 15,25 configuration. C. How are ephedrine and pseudoephedrine related? , d. Draw all other stereoisomers of (-)-ephedrine and (+)-pseudoephedrine and give the R,S designation for all stereogenic centers. OH Ephedrine 825 1S 25