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- 1. Draw all of the stereoisomers of 2,4-dichloropentane. Indicate the relationship between these stereoisomers, such as enantiomers, diastereomers, or meso compounds.a. Draw the 14 constitutional isomers of molecular formula C8H9Cl that contain a benzene ring.b. Name all compounds that contain a trisubstituted benzene ring.c. For which compound(s) are stereoisomers possible? Draw all possible stereoisomers.a. Draw the 14 constitutional isomers of molecular formula C8H9Cl that contain a benzene ring. b.Name all compounds that contain a trisubstituted benzene ring. c.For which compound(s) are stereoisomers possible? Draw all possible stereoisomers.
- 5. Consider the following pairs of structures. Identify the relationship between them (enantiomers, diastereomers, or identical compounds. он HO o CH,OH H,C H но CH,OH сон H HO. HO CH, HO,C CH COH HO,C, CO,H CO,H н онн он н онн он HOH,C сно OHC CH,OH Br CH,CH, H,CH,C CI CH OHWhich of the following statement is NOT correct? 2 3 4 a. b. C. d. a b C d Constitutional isomers are compounds whose atoms are connected differently. Stereoisomers are compounds whose atoms are connected in the same order but with a different spatial arrangement. Diastereomers are stereoisomers that are mirror images. Molecules that are not identical to their mirror images are a kind of stereoisomers called enantiomers.2 Identify the following pairs of compounds as identical or isomers. If they are isomers, are they constitutional isomers or stereoisomers? If they are stereoisomers, are they enantiomers or diastereomers? Clearly write the words- identical, enantiomers, diastereomers, constitutional isomers. H3C CH3 and H3C. H3C Br H.
- 2. Draw all stereoisomers for the following molecules; indicate the stereochemical relationships for all possible pairs. Br HO Br ОН но H3C Br (G)Indicate whether the pair of structures shown represent stereoisomers, constitutional isomers, different conformations of the same compound, or the same conformation of a compound viewed from a different perspective. Note that cis, trans isomers are an example of stereoisomers. HO Br НО. -Br Br Br CIQ1: 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
- 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 251a. How many stereogenic centers are present in the structure below? Indicate them with asterisk(s). How many stereoisomers are possible? # of stereogenic centers: # of possible stereoisomers:1. Give the number of stereogenic centers in the pain reliever Met-enkephalin, mark the corresponding stereogenic centers with an asterisk. H₂N. OH HO S I CH3
