(a) How many chirality centers does prostacyclin have? Mark each of them. (b) Draw the structure of enantiomer of Prostacyclin I₂. HO*** HO Prostacyclin I₂ OH
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- 1. Consider the following pairs of structures. Designate each chirality center as (R) or (5) and identify the relationship between them by describing them as representing enantiomers, diastereomers, constitutional isomers, or two molecules of the same compound. Use handheld molecular models to check your answers. HG (a) Br and and CH H,G H (b) and CH, Br Br 'F (k) and Br CI Br (e) and CH, CH, CH CH, CH, H- -H- CH and H- -Br (d) and FCH CH, CH, Br H CH, and (m) (e) and H. Br CH, and (m) and Br CH (o) and nd and and andCoibacin B (shown below) is a natural product that exhibits potent anti-inflammatory activity and potential activity in the treatment of leishmaniasis, a disease caused by certain parasites (Org. Lett. 2012, 14, 3878-3881): (a) Assign the configuration (R or S) of each chirality center (labeled A to C) in coibacin B. (b) Identify the number of possible stereoisomers for this compound, assuming that the geometry of the alkenes are fixed. Choices are given below and write the CAPITAL LETTER of your choice. A. 2 В. 4 С. 8 D. 16 ANSWERS: (a) A. В. C. (b)2.) For the following 12 compounds, please write the number of chiral centers (0 if there are none) and label each molecule as either chiral or achiral. H3C H3C HO H3C H3C H3C H3C H3C H3C CH3 CH3 OH OH H3C OH OH OH он H3C H,C H3C, H3C H3C OH H3C H3C OH HO H3C но OH OH H3C OH CH3
- 4. Answer the following question for the molecule shown: (a)How many chirality centers does it have? Identify them. (b)How many stereoisomers of are there? (c)Draw the structure of the enantiomers. (d)Draw the structure of a diastereomers. сно но5. 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(A) How many chirality centers does the following molecule contain? (B) How many stereoisomers are possible for this molecule? (C) Assign R,S designation to each chiral carbon
- 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(a) assign R or S configuration to each chiral center, (b) Which compound are enantiomers? (c) Which compounds are diastereomers?How many stereocenters are present in diosgenin (structure below)? Me HO Me H I Me H Me I..
- [Review Topics) References] M Identify the absolute configuration of the chirality centers in each of the following compounds as R or S. Note: if multiple chirality centers are present, indicate the stereochemical designations as: RR, SS, RS, or SR (Other terms used for chirality center include chiral center, stereocenter, and stereogenic center.) M MD M CH3 req N. req NH2 req HO2C НО-С 9 more group attempts remaining Retry Entire Group Submit Answer Nes Previous Save and Exit 7:01 PM ) E 10/30/20191. Is the molecule shown below chiral or achiral? HO₂C OH 2. Is the molecule shown below chiral or achiral? CH₂OH H OH CO₂H 3. Which of the following terms best describes the pair of compounds shown: enantiomers, diastereomers, or the same compound. CH3 & D ....!!!!! H3C Holl 4. Label each chiral carbon in the compound below as R or S. JOH // 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)