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- 5 6 How many stereoisomers of the following molecule are possible in principle? Attachments HO H₂C A. 8 B. 128 C. 64 D. 32 E. 16 CH3 HO What is the relationship between the following two compounds? Attachments HO OH OH moja moja A. They are diastereomers B. They are enantiomers ⒸC. They are mesomers D. None of the above NH₂ OHDescribe the stereochemical relationship between the two structures below. H H CHO OH OH CH₂OH I OA Mesomers HO H B. Enantiomers OC. Conformers D. Raceomers E.Diasteromers CHO -H -OH CH₂OH II36-39. Identify the type of stereoisomerism Choices: A. conformational diastereomers B. enantiomers C. constitutional isomers D. configurational 36. 37. 39. H3C 38. H3CH₂C Br CH3 H H3C Br H CH3 H CH₂CH3 CH3 diastereomers CI CH3 H3C H3C H₂ I Br Br CH3 CH3 Br CH3 CH3 CH₂CH3
- 33. The configuration of the compound below indicated by an asterisk is OH H HO HO A. R * HO CH,NH2 A. 4 B. S 34. In principle, how many stereoisomers of S-adenosylmethionine are possible? NH₂ Methionone NH₂ N gling of HO B. 8 C. d OH A. It has a chiral center B. It is chiral C. It is achiral D. choices A and B D. I C. 16 5 D. 32 35. Which of the following statements about the compound below is TRUE? CH3 CH38. Identify the stereochemical relationship between the structural pairs shown below as (A) identical structures that are not meso; (B) identical structures that ARE meso; (C) structures that are enantiomers; or (D) structures that are diastereomers. a) b) H3C c) CH3 Br H. CH3 Br Br CH3 H. CI Holl H Cill Cl- CH3 Br H. CI CH3 HO. H. H3C Cl H3C- H- H. CH3 Cl a) b) c) 9. Identify the stereochemical relationship between the structural pairs shown below as (A) identical structures that are not meso; (B) identical structures that ARE meso; (C) structures that are enantiomers; or (D) structures that are diastereomers. a) b) c) CH2CH3 NH2 HO CH3 H3C. CH3 Cl HO H;C CH2CH3 F. F H;C. CI H H,N -CH3 CH3 NH2 H3C Br H2N C1 H3C CH3 CH3 H;CH,C- Cl F H. H Br CH,CH3 CH3 a) b) c)5. Consider the following pairs of structures. Identify the relationship between them (enantiomers, diastereomers, or identical compounds. HOH2C H OH H OH HO H Br H3C Н H H₂CH₂C CI Br H CHO CH3 I CH3 OH OHC Н H OH H OH Bell!! H3C, HO H Н.С H CH₂CH3 CH3 CI HỌ,H CH₂OH Br
- How many R and S stereocenters are there in the 5-a-Dihydrotestosterone molecule ? a 3S, 3R b. 3S,4R C. 6S, 1R d. 1S,6R e. 4S, 3R3 Which of the following is a chiral C-atom? See attachment! Attachments O2₂N A. A B. B OC.C A OH OH D. A and B E. B and C F. A and C G. All are chiral carbons CI B CI C Which statement(s) is/are true? A. Diastereomers will always have the same biological properties. 0 B. Diastereomers are configurational isomers which are non-superimposable mirror images of each other. C. The rotation of plane-polarised light will always be exactly the same for all diastereomers of a given compound. D. Diastereomers have different physical and chemical properties.4. For each pair of molecules, assign the configuration at each chiral center as R or S. Give the relationship between the pair of molecules as no relation, constitutional isomers, same molecule but not meso, same molecule and meso, enantiomers, or diastereomers. There should only be one possible answer. a. OH OH b. Br Br с. NH2 NH2 NH2 NH2 d. HO НО
- Page 218 Draw all possible stereoisomers for each compound. Label pairs of enantiomers and diastereomers. Label any meso compound. 5.58 OH а. OH b. CI Br с. d.Identify the enantiomers, meso compounds, and diastereomers among the stereoisomers below. CH3 ÇH3 CH3 CH3 HO он HO H OH он он H H OH OH H3C H3C H3C d. H3C а. b. с. C----O C.5. Consider the following pairs of structures. Identify the relationship between them (enantiomers, diastereomers, or identical compounds. H3C OH H₂C HOITY H CH₂OH HO HO C,, CO₂H вой HOH2C CH₂ OH H OH H OH Н HO H H COzH Br Д H3C Br H₂CH₂C CI H CHO CH3 I CH3 OH HO Н HO... HO C OHC Н H3C, Bell!! H CO₂H Н.С CH₂OH H OH H OH HO H CH₂ CO₂H HỌ,H CH₂CH3 CH3 CI CH₂OH Br