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- Consider the Newman projections, A-C. CHO Н. H CHO OH A CH₂OH OH но. н H ОН CH₂OH B н. НО CHO OH C .CH₂OH н i. Determine the structural relationship of A and B; B and C. ii. Without a change in conformation, assign the configuration to the chiral centers in B.4. 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 ОНIX. Assign R, S configurations to each indicated chirality center in the molecules below. HO. HO 16. OH Ye H HO₂C H 14. HO CO₂H OH The configuration of carbon 14 is The configuration of carbon 16 is The configuration of carbon 18 is H CH,NH, H 15. H₂N CH3CH₂ 17. COOH ----CH3 H CH3 The configuration of carbon 15 is The configuration of carbon 17 is 18.
- 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.Q4: a: Assign the absolute configuration of all chiral centers in molecules B and C by writing R or S directly adjacent to the chiral carbon. COOH COOH COOH ÇOOH ÇOOH H- HO- но H- H. HO- но H. но HO. H- OH но -H- но H. HO- H. COOH COOH COOH COOH COOH A C b: List any pairs of enantiomers: c: List any pairs of identical molecules: d: List any pairs of diastereomers: e: List all meso compounds: f: List all dextrorotatory compounds:VIII. Assign R, S configurations to each chirality center in the molecule below. Br CH3 X OH CH3 I I (
- Chrome File Edit View History Bookmarks Profiles Tab Window Help OO stereoisomershw.chem420.f16 X + ← → C G Search Google or type a URL stereoisomershw.chem420.f16.s20.s23 TE 26 1 • Quedla od 22,293 . MAR 8 H 010 C 2. Assign the R or S configuration to each chiral center in the molecules below. CH₂OH H₂C 1 / 1 W H =CH₂ CH3 CH(CH3)2 125% 12 + H3C CH3 Br A .CH,NH, H₂ W m P H 34% ¹ CH₂CH₂CH3 CH3 O Wed 5:01 PM CHBrCH₂CI H₂N CH₂Cl 3 4 (numbers indicate the IUPAC numbering) =S + Q III ⠀ :5. Each molecule below has CH3 но, a chiral carbon. Determine the absolute configuration (R/S) for each. ÇH, Et OH н. H3C. н н сно н4. Identify the chiral centers in the following molecule and label each as R or S. Но
- - Assign R or S configuration to each chiral centre H. CH2 HO \CH(CH3)2 H. CH2OH H3C 'NH2 H. H CH3 CH3 H. CH3 НО С. `CH2CH3 CH3 H4. Identify the chiral centers in the following molecule and label each as R or S. но H.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 CH₂CH3