Part 1 of 2 Each of the following compounds can exhibit optical activity. Enter the label number of chiral center(s) in the following compounds. If more than one, separate them with commas. H OF || | | HO-C-C-C=C-H 121 H 3 The chiral center(s) is/are at Part 2 of 2 H-C-H H G
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- 5. Consider the following pairs of structures. Identify the relationship between them (enantiomers, diastereomers, or identical compounds. HOH2C H OH H OH HO H Br H3C Н H H₂CH₂C CI Br H CHO CH3 I CH3 OH OHC Н H OH H OH Bell!! H3C, HO H Н.С H CH₂CH3 CH3 CI HỌ,H CH₂OH BrIndicate the orientation of the chiral center indicated by a red *. Н OH CH3 Molecule 1 Orientation: H н 2H Molecule 2 Orientation: H3C H3C H OH Н 2H CH3- entel® ZEH10 Ⓡ raser de haute qualité de calidad superior CHO AP S a) Assign the absolute configuration of the chiral carbon in Compound Q below. Br Compound Q OH b) When Q is treated with an oxidizing agent, it forms Compound P. (The alcohol is oxidized to a carboxylic acid.) Assign the absolute configuration of the chiral carbon in Compound P. Br OH oxidation Br OH c) If you did a) and b) correctly, the chiral carbon should have changed its absolute configuration even though it was not involved in the reaction. Explain what happens.
- 5. Consider the following pairs of structures. Identify the relationship between them (enantiomers, diastereomers, or identical compounds. он HO o CH,OH H,C H но CH,OH сон H HO. HO CH, HO,C CH COH HO,C, CO,H CO,H н онн он н онн он HOH,C сно OHC CH,OH Br CH,CH, H,CH,C CI CH OH6. Each of the following pairs of compounds contains one chirality center. Determine whether they are the same compound or enantiomers. If they are superimposable, they are the same. If they are nonsuperimposable, they are mirror images, they are enantiomers. I-C Me- Br H C1 Br „Et www. H Br₂ C1 H Me ~C-I Et Br H I-C Et- Br Me Me Bric- H H Br Me H H-C -I Br Me EtClassify the structures as being either an enantiomer, diastereomer or diastereomer/epimer of D-glucose. Structure A: CH H- -OH Structure B: но- H- H- OH Structure C: H- он H- -H D-Glucose: OH || CH CH CH он H- он но -H H- он но он но но- H- но H- OH OH но -- H- -H H -Ç-H Structure A: OH Structure B: OH Structure C: OH
- Identify the absolute configuration of the chirality centers in each of the following compounds as R or S. Note: if multiple chirality centers are present, indicate the stereochemical designations as: RR, SS, RS, or SR. (Other terms used for chirality center include chiral center, stereocenter, and stereogenic center.) Co,H OH CO2H D. H H2N H HO2C OH CO,H HO CO2H b.) a.) d.) CO,H H H2N CO2H f) HO g.) h.)The Fischer projection of glucose is shown. How man chiral centers does glucose have? How many stereoisomers of glucose can exist (including glucose, itself)? Define the absolute configurations (R or S) for carbons 2 and 3. H-C-OH HO-C-H H C-OH H-C-OH CH,OH owank o -n) wolad me glucoseIs the following central carbon a chiral center? Is the central contoe in follawing molecule a chiral center? 2. Is the central carbon in following molecule a chiral center? H&C F H
- 6. Each of the following pairs of compounds contains one chirality center. Determine whether they are the same compound or enantiomers. If they are superimposable, they are the same. If they are nonsuperimposable, they are mirror images, they are enantiomers. Br C1 I_CC1 I— H Ме- Me-C Br Et H Br Cl H C-I Me-C Et Br H I-C Br Me BrC-I H H Et-C Br Me Me H H-C Br Me Et 1 2 Sk 954~ Rost 45 r SiTwo 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 linkageIdentify the absolute configuration of the chirality centers in each of the following compounds as R or S. Note: if multiple chirality centers are present, indicate the stereochemical designations as: RR, SS, RS, or SR. (Other terms used for chirality center include chiral center, stereocenter, and stereogenic center.) H₂N H HD HO OH OH CH3
