7.(a) Draw and label (i) the enantiomer and (ii) a pair of diasteromers of the following compound. он (b) Will a 50:50 mix of the enantiomers that you drew for 7al be optically active (rotate plane polarized light). Explain the reason for your answer
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- 7.(a) Draw and label (a) the enantiomer and (b) a pair of diasteromers of the following compound. OH (c) Will a 50:50 mix of the enantiomers of the compound be optically active (rotate plane polarized light). Explain the reason for your answer d) Will a 50:50 mix of the two diasteriomers you drew in (c) be optically active (rotate plane polarized light). Explain the reason for your answer7.(a) Draw and label (i) the enantiomer and (ii) a pair of diasteromers of the following compound. OH (b) Will a 50:50 mix of the enantiomers that you drew for 7al be optically active (rotate plane polarized light). Explain the reason for your answer b) Will a 50:50 mix of the two diasteriomers_you drew for 7bii be optically active (rotate plane polarized light). Explain the reason for your answerWhat% of the enantiomer (R) contains a mixture with an 80% enantiomeric excess in the enantiomer S)? Explain your answer.
- Identify pairs of molecules that represent enantiomers and diastereomers and identify each center stereogenic by writing R or S next to it.A solution prepared by mixing 10 mL of a 0.10 M solution of the R enantiomer of a compound and 30 mL of a 0.10 M solution of the S enantiomer was found to have an observed specific rotation of +4.8. What isthe specific rotation of each of the enantiomers? (Hint: mL * M = millimole, abbreviated as mmol)(3) Prostacyclin I₂ is an important compound, which performs a variety of functions in animal body. (a) How many chirality centers does prostacyclin have? Mark each of them. (b) Draw the structure of enantiomer of Prostacyclin I2. HO... HO*** Prostacyclin 12 OH
- 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)b) A synthetic sample of MSG (conc 0.350 g/mL) is found to be a mixture of two enantiomers. What is the percentage of each enantiomer in the sample if the experimental rotation of the sample is found to be -2.15°?4. Draw all possible stereoisomers of the following compounds. Assign the appropriate absolute (R/S) or geometric (E/Z) configuration to each of the stereoisomers (or double bonds) and label pairs enantiomers, diastereomers and meso compounds. (a) CH3CHBRCHOHCH3 (c) CH3CH=C(Br)CH=CHCI (e) CH3CH₂CHOHCHOHCH2CH3 (g) OH НО... CI (h) H3C Br (b) CH3CHBRCHBRCH ₂Br (d) CH3CH(C6H5)CHOHCH3 (f) CH₂(OH)CH2-CH(OH)CH=CHOH CH3 (1) Br HS Br
- 5. Assign R or S configuration to each chirality center in the following molecules: CH3 CH3 Br (a) Br (b) (c) HaCH3 HaBr H OH CH3 H3C H OH H CH3 OH Which of these compounds are enantiomers, and which are diastereomers?Coibacin B (shown below) is a natural product that exhibits potent anti-inflammatory activity and potential activity in the treatment of leishmaniasis, a disease caused by certain parasites (Org. Lett. 2012, 14, 3878-3881): (a) Assign the configuration (R or S) of each chirality center (labeled A to C) in coibacin B. (b) Identify the number of possible stereoisomers for this compound, assuming that the geometry of the alkenes are fixed. Choices are given below and write the CAPITAL LETTER of your choice. A. 2 В. 4 С. 8 D. 16 ANSWERS: (a) A. В. C. (b)4. Answer the following question for the molecule shown: (a)How many chirality centers does it have? Identify them. (b)How many stereoisomers of are there? (c)Draw the structure of the enantiomers. (d)Draw the structure of a diastereomers. сно но