10. Draw all stereoisomers of CH3CHCI-CHBRCH3 as Fischer projections and label the R, S configurations. Indicate the enantiomeric and diastereomeric relationships among the isomers.
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- Consider the below structure: a. Draw 3-D structures and a Fischer projection for the 1R, 2S, and the 1S, 2S stereoisomers of the above structure. b. Draw all the conformers obtained by rotation about the C1-C2 bond and rank them in order of increasing stability.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)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
- 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 OHConsider CH3-CH(OH)-CH(OH)(Br). a.How many stereogeniccenters are in the molecule? b.How many stereoisomers are there for the compound? c.Draw the Fischer projection for each of the stereoisomer. Label each using I, II, etc. d.Which pairs are enantiomers? Which are diastereomers? e.Determine the absolute configuration of each chiral center in one pair of diastereomer.11. Consider the following compounds: ÇO,H CHO ОНС H. ОНС CO,H H3C- -- H. HO- H3C H. O, H ČOH HO, CH3 B (a) Label the asymmetric carbons as R or S on each compound (A - C). (b) Which compounds, if any, are enantiomers? diastereomers? identical?
- For the compound shown below, correctly label the stereogenic centers. O C1 is R; C2 is R O C1 is S; C2 is S C1 is S; C2 is R C1 is R; C2 is S1. Below is the Fischer projection of a molecule. Is this the (R) or (S) enantiomer? 2. If you swap the positions of the H and the Cl, does this represent the same enantiomer or the opposite one? 3. Having swapped the positions of the H and CI, if you then swap the Cl and methyl group, what happens to the stereochemistry of the chiral center? CH3 H- CI CH,CH3Consider the below structure: ОН 1 H3CHN a. Draw 3-D structures and a Fischer projection for the 1R, 2S, and the 1S, 2S stereoisomers of the above structure. b. Draw all the conformers obtained by rotation about the C1-C2 bond and rank them in order of increasing stability.
- Draw and identify (R) and (S) enantiomers of lactic acid, CH3CH(OH)COOH. Use the proper conventions to draw Fischer projections.Of the four structures shown here in Fischer projections, indicate the relationships between (a) and (b), and between (c) and (d)? CHO CHO нтон нотн CH₂OH (a) CH₂OH (b) ÇO₂H H-OH -OH -он но- HO- CO₂H (c) II HO-H ÇO₂H of A. Both pairs are enantiomers O B. Both pairs are identical C. (a) and (b) are enantiomers, (c) and (d) are identical D. (a) and (b) are identical, (c) and (d) are enantiomers II CO₂H (d)2 Draw all stereoisomers for the following molecules; indicate the stereochemica interrelationships (enantiomer, diastereomer, or meso) for all its possible pairs. 4) H;C CH3 Но CH3 OH CI CI Но OH