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- Calculate steric strain in this conformation using the n-atom interaction method. H H___H H₁ H HH HH. H H O 1 kcal/mol 2 kcal/mol 3 kcal/mol 4 kcal/mol 5 kcal/mol HH HHO O CI + enantiomer + enantiomer CI + enantiomer CI + enantiomer CI + enantiomerTwo 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
- What is the relationship between the parent structure on the left and the structure on the right? HO O O O COOH H H-OH B A: Enantiomers B: Diastereomers C: Completely unrelated molecules D: Identical molecules CH₂OH HO HO COOH H H CH₂OH5. 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 BrPart D. Do the two structures A and B of each pair drawn below represent the same molecule, constitutional isomers, or stereoisomers? If A and B are stereoisomers, further classify them as enantiomers or diastereomers. H3C Structure A H3C HO H3C H3C Br T H H3C H HO H3CC H C Br HC H H H H CH₂Br CH₂CH3 H CH₂CH3 CH₂OH OH H HO G G H HO H HO G CH3 CH3 CH3 Br Hallo H H3C H Structure B H3C CH3 Br WING H Br HOCH₂ CH3 CH3 HO H CH₂OH H CH₂CH3 H CH₂CH3 H H H H H H Gim CH3 H OH "H ·GII. CH3 HO. OH OH CH3 CH3 OH Relationship of A and B
- a 3. Label each pair of the of molecules as enantiomers, diastereomers, or identical. CI CI H3C Br c H₂C OH H CH3 "H CH₂CH3 НО. H3C H3CH₂C CH3 H Br CH₂ H d HN H -CH3 NH₂ CH3 HN H- NH₂ -H CH3 CH3Define each stereocenter as either (R) or (S). If the molecule does not have a stereocenter select "achiral". CH3 CI H CI CI CH3 H3C H3C., H 'CH3 Br H, Br Br Br1. How are each of the structures A-F related to structure X? They could be E (enantiomers), D C (conformers), or I (identical). (diastereomers), CH3 CI -Br HOH₂C- -OH CI X НО, H3C H₂C D CI Br CH₂OH CI HO STEREOISOMERS Br A CH2OH CI Br CI HOH₂COH CI CI Cl CH3 OH E -CH3 -CH₂OH B Br Br НО. Br CH3 HOH₂C CI C CI CH3 HO CH₂OH F
- Compare the two possible chair conformations of this molecule. Using A-values, calculate the difference in energy of the two possible chair conformations. kcal/mol 1 3 Table of A-Values in kcal/mol 5 6 -CH, 1.7 -OH 0.87 -CH,CH, -CHỊCH 2.15 -CICHh 1.75 -OCH, 0.67 -CI 0.48 4.9 -Br 0.43 7 9 +/- x 100 2. 4.Each H↔H eclipsing interaction in ethane costs about 4.0 kJ/mol. How many such interactions are percent in cyclopropane? What fraction of the overall 115 kJ/mol (27.5 kcal/mol) strain energy of cyclopropane is due to torsional strain.Fönt Paragraph Styles 1. Use the lettered molecules below to answer the following questions: CI, H HO H OH H CI HO HO, B D CI ClH H, H CI CI H3CO H E F G A) Identify 1. A pair of enantiomers A 2. A pair of diastereomers D 3. A pair of meso compounds C 4. A pair of identical compounds E and E Differentiate between achiral and meso. Achiral compounds have no chiral centers whereas meso compounds have multiple chiral centers.
