Q2 Give the stereochemical relationships between each pair of structures. Examples are markSI same compound, structural isomers, enantiomers, diastereomers. CHOH CH, CH, (e) CH, CH (h) CH,OH (a) -OH HO H H OH H- H OH HO -ОН НО H- HO-H H OH HO- OH HO- CH, CH, CH, CH, CH, CH,
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- Q2 Give the stereochemical relationships between each pair of structures. Examples are same compound, structural isomers, enantiomers, diastereomers. (a) CH, CH, CHOH CHOH CH, CH, H OH HO-H H OH HO H H--CH HO- HO H H- OH HO- OH HO H H-OH CH, CH, CH, CH, CH, CH,Q2 Give the stereochemical relationships between each pair of structures. Examples are same compound, structural isomers, enantiomers, diastereomers fa CH. OH HO- OR HO CH, CH. CH,Department Final EXd Q1: Coibacin B is a natural product that exhibits potent anti-inflammatory activity and potential activity in the treatment of leishmaniasis, a disease caused by certain parasites. HAH H (a) Assign the configuration (R or S) of each chiral center in coibacin B. (b) Identify the number of possible stereoisomers for this compound, assuming that the geometry of the alkenes is fixed.
- 2. From the molecules below, determine the relationship between each pair (a-b, a-c, a-d, etc.): identical, constitutional isomers, enantiomers, diastereomers. In this problem, conformational isomers are considered identical, PUCH H HOCH an e OF CH 學 HOCH。 HOCH CH H OH 10- h H d. E HO CH "OH CH₂CH PHON 美 FOH H -OH1. Which of the following is a chiral molecule? Encircle the substituents that make it chiral. H c=c=CCH3 'CO2OH (A) CH2OH CO2H H (B) (C) CH3 CH3 (D) poddns2 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
- 3. For each of the following pairs of structures identify the stereochemical relationship as identical, constitutional isomers, enantiomers or diastereomers. (^- a) b) SH H₂C SH CH 3 ၀င်း H₂C CH3 HOne of the isomers of 1,2,3,4,5,6-hexahydroxycyclohexane, called myo-Inositol, acts as a growth factor in both animals and microorganisms. Draw the most stable chair conformation of myo-Inositol (Note: account the wedge and dash projection). Draw the most stable cis-trans stereoisomer of myo-Inositol. OH HO ОН HO "OH ОН(A)Menthol, used to flavor various foods and tobacco, is the most stable stereoisomer of 2-isopropyl-5-methylcyclohexanol. Draw its most stable conformation. Is the hydroxyl group cis or trans to the isopropyl group? To the methyl group? (b) Neomenthol is a stereoisomer of menthol. That is, it has the same constitution but differs in the arrangement of its atoms in space. Neomenthol is the second most stable stereoisomer of 2-isopropyl-5methylcyclohexanol; it is less stable than menthol but more stable than any other stereoisomer. Write the structure of neomenthol in its most stable conformation.
- 1E.) Which of the following two conformers is lower in energy? Both conformers are of equal enery O A Conformer A is lower in energy. B Conformer B is lower in energy. It cannot be determinedQ5. Estimate AG (free-energy difference being positive or negative; equilibrium direction) between the stable and unstable chair conformations of the following tri-substituted cyclohexanes and explain your reasoning. CH3 OH OH CH3 OH CH3 F OH CH3 F OHNH2 Br 1 OH ОН (a) Use the template below and drawa Newman projection for this conformation of the compound when viewed along the C2-C3 bond. CH2OH (b) Why is this the most stable conformation?