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- label the stereocenters r,s,e,z and specify if any are meso. whats are the products to each orher? draw the chair conformationd and explain which one is the most stable for both products. are ha and hb homo/enantio/diasterio/hetero topic? also hc and hd.On the molecule below, highlight all R stereocenters in red and all S stereocenters in blue. If it doesn't conta box under the drawing area. No stereocenters H₂N XC. IDENTIFYING STEREOISOMERS: Label each pair of molecules below as enantiomers, diastereomers or identical CO₂H HO HC но-- н H -.Н CH3 OH CH₂OH HO™ H₂OC H₂C Н-- HO Н CH3 OHH CH₂OH HOC-... HOCH₂. H OH H OH HO H CHO COzH ОНС но с HO H COzH Н ОН НО Н CH₂OH
- Assign R and S configurations to the chirality centres of the compounds below: O₂N ... OH ||||| 15 IC/ CI CH₂OH NHCOCHCI₂ HO₂C NH₂ H H H3C HO CH34) What pairs of compounds I-IV below are enantiomers to each me buy that takan B../.4- C other? CL I CL I II A CL II CL III II B NEL CLASZOK I IV III CI None D تكرة IV All EConstruct models of 1,2-dibromocyclopentaneand draw all the possible stereoisomers. Label each chirality centre with an*,andan Ror S. Indicate clearly which pairs are relatedasenantiomers and which as diastereoisomersor meso.
- 8. 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)The stereoisomer of cholesterol found in nature is shown here.a. How many asymmetric centers does cholesterol have? b. What is the maximum number of stereoisomers that cholesterol can have?6. For each pair of compounds below determine whether they represent the same molecule, enantiomers, or diastereomers. CH H₂N H CH J OllinO 2||2 COOH C OH CH₂ OH NH₂ CH, COOH CH3 HO H₂N CH₂4 CH CCC COOH OH NH₂ NIIIIIC CH₂ H CH3 CH3 H₂N HO H₂N COOH CH OH 5- O J CH3 COOH O H CH₂ H COOH HO CH CH₂4 HOOC COOH ........ OH JCC H NH₂ NH₂ CH₂
- Explore! Determine the absolute configuration of the following compounds and draw the structure (Fischer projection) of the other enantiomer. CN CH3 HO CH2NH2 Br "CH3 A В SH ОН H3C CH3 CH2OH C=CH ČH3 E HOOC1. Identify as chiral or achiral. но. н. он он он Он19) Draw Fischer projections for the following molecules HO H C₂H5 H CI Cillim H J H "!!!!IOH Brill Br OHC COOH HO 20) Draw all possible stereoisomers for 2,3-dihydroxybutane and label any meso compounds.