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- 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 2.5Classify each pair of compounds as either identical, constitutional isomers, stereoisomers, or not isomers.Jj.15.
- 1. Name each compound and determine the relationship between the pairs of compounds. O a. Name: b. Name: N C. Relationship between structures above: Conformational isomer or Structural isomer 2. Name: 3. Is the following structure the cis stereoisomer or the trans stereoisomer?. Determine whether the molecules in each pair are the same or enantiomers. H H C CH;CH, a. CH3CH2 l CI CH3 CH3 H H b. H3C HOWCH, Cl но Но CH3 CH3 H CH c. CH3 H HC, CH3 CH3 H;C. H,C || CH2 CH3 CH2Determine whether each compound exhibits optical isomerism. a. CCl, b. CH;-CH2-CH-CH;-CH,-CH2-CH, CH3 H c. CH,-C-CI NH2 d. CH,CHCICH,
- Are compounds with different placement of double/triple bonds considered stereoisomers or constitutional isomers?Draw the enantiomer and diastereomer of the following molecule. a. b. CH, H H HC H CH3 CH; H15. Naming Stereoisomers with Two Chiral Carbons Using the RS System The (RR) isomer of methyphenidate (Ritalin) is used to treat attention deficit hyperactivity disorder (ADHD). The (S.S) isomer is an antidepressant. Identify the two chiral carbons in the structure below. Is this the (R.R) or the (S.S) isomer? Draw the other isomer. HN- H. ..
- Determine whether each compound exhibits optical isomerism. a. CCI4 b. CH3-CH2-CH-CH,–CH2-CH,-CH3 CH3 с. CH3-C-Cl NH2 d. CH;CHCICH37. Which of the following molecules contains a stereogenic carbon properly designated as R? A. B. OH NH₂ D. OH CHO E.Classify each compound as identical to A or its enantiomer. CHO CHO H OH CHO a. CH,CH-C--OH CumCH,CH3 H OH b. d. HO C. ČH,CH3 н он CH;CH CHO CHO A



