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Can i get an explanation on how to do 4 a, b, c? Thank you
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- Lithocholic acid is an A–B cis steroid found in human bile. Draw lithocholic acid showing chair conformations, as in Figure 27-11, and tell whether the hydroxyl group at C3 is axial or equatorial.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?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
- 7) Identify the relationship between the following pairs of molecules [constitutional isomers, enantiomers, diastereomers, conformers, same molecule (non-meso), meso compound] a) c) C₂H5- H Br CI H CH3 Br H. CI Br H Br C₂H5 CH3 CI b) d) H. H Ph H F Me Br H H Et Br H F Et Me PhQ1. Draw the enantiomers for the following molecules and assign all chiral centres as R or F |C(CH3)3 -PH2 CHO Br CH2OH HTwo sugars differing in configuration at a single asymmetric carbon atom are known as epimers. D-mannose is a C-2 epimer of glucose (Structure I), while D-galactose is a C-4 epimer of glucose. Structure Il and IIl are H- -OH но- -H H OH HO H но- H HO H H -OH H- -OH HO OH H -OH H- -OH H OH HO. HO, OH II II Which of the following represents an aldopentose? OH H O HO O HO H но н HO H но- HO H HO H HO- H OH H OH H OH H OH OH HO Он of но" HO O OH он III IV These are chemical messengers that are secreted by endocrine glands and carried through the bloodstream to target tissues. prostaglandin deoxysugar glycoside hormones Which of the following is NOT correctly paired? cellulose: beta-1,4-glycosidic linkage amylose: alpha-1,4-glycosidic linkage chitosan: alpha-1,4-glycosidic linkage cellubiose: beta-1,4-glycosidic linkage
- E). Provide the absolute configuration of each chiral center (R, S or none). i) Lowest CIP priority group back (4) H (3) cew (3) (s) (1) CI н (ч) (3) (8) (3) H(4) a (¹) F (2) (s) (NH₂ (4) H (5) (9) (25) C (R) (4) Koy (2) (R)Consider the following Fischer Projection Formulas: CHO CHO CHO CHO OH H- Но H. но H- OH но HO H HO H HO -H CH2OH CH2OH CH2OH CHO II IV Which are enantiomers? Il & IV I| & II | & II O I&II エエ8. Two structures of Lipitor (a drug used to lower cholesterol) are shown below. (a) Determine the absolute configuration of each indicated stereocenter. Fill in the correct circle. (b) Determine if the two structures are the same compound or stereoisomers. Fill in the correct circle. (a) НО. Carbon a HO O OH Carbon a: OR OS Carbon b H N Carbon b: R OS of H Carbon c: OR OS OH OH Carbon c F Carbon d: R OS OH Carbon d (b) The two structures are: O the same compound O stereoisomers
- 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)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.Assign R and S configurations to the chirality centres of the compounds below: O₂N ... OH ||||| 15 IC/ CI CH₂OH NHCOCHCI₂ HO₂C NH₂ H H H3C HO CH3