1. Erythritol is an artificial sweetener found in many products. Is this chiral, meso, or achiral. Assign R and S to any stereocenters. OH НО. OH Erythritol OH
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Could some one answer these
Question 1 and 2
Parts A-B-C
I do not need a super detailed explanation i just need to see if did them correctly this is a practice set and is non graded
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- III. Consider the compound below. H. F HO- HO -HO- (Atomic number: H-1, C-6, O-8, F-9) a. How many chiral centers are in the molecule? b. How many stereoisomers are there for the compound? c. Draw the Fischer projection for each of the stereoisomer and determine the absolute configuration (R or S). Label each using I, II, etc. d. Which pairs are enantiomers? Which are diastereomers?Consider 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.III. Consider the compound below. CH, CI- Br но O- H. (Atomic number: H-1, C-6, O-8, CI-17, Br-35) a. How many chiral centers are in the molecule? b. How many stereoisomers are there for the compound? c. Draw the Fischer projection for each of the stereoisomer and determine the absolute configuration (R or S). Label each using I, II, etc. d. Which pairs are enantiomers? Which are diastereomers?
- Considerthe image below. a. Draw the mirror image of structure I and label it as structure II.b. Are I and II chiral?c. What kind of stereocenters do they represent?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 НО4. For each of the following molecules, label each stereocenter as R or S. Label the molecules appropriately as chiral or meso. a. b. methionine NH₂ H d. но. OH c. D = 2H, T = ³H, isotopes of hydrogen. f.T. OH OH CI Y ОН
- Ephedrine, a stimulant and illegal drug is an optically active compound with two chiral centers. OH NHCH3 CH3 Ephedrine a. In the structure of ephedrine on the answer sheet, mark each chiral center with an asterisk. b. How many stereoisomer/s does ephedrine have? Show necessary solutions on the answer sheet. c. Compound EPS is a stereoisomer of ephedrine. Determine the absolute configuration (R or S) at carbons A and B of compound EPS.5. Draw the structure of (S)-1-bromo-1-chloropropane. Take care to indicate the three- dimensional stereochemistry properly. 6. How many chiral centers does the following compound contain? CH3 7. Label each chiral carbon in the molecule below as having R or S configuration. HO₂C H F. H3C H CH₂CH32. Mark any chirality centers (asymmetric carbons) with a *. How many stereoisomers are possible? Br
- 1. Locate/Label the chirality center of the given molecules. a. OH H2N C H CH3 CH3 SH b. OH HO CH2NHC(CH3)3 HOCH21. 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,CH3a) Which structures are Enantiomers? b) Which structures are Diastereomers? c) Which structures are meso compounds? Use the letters only for your answers. А. В. H H CI H H Cl C. H H D. H Cl ČI Cl CI H