Concept explainers
Interpretation: The two enantiomers of the amino acid leucine, HOOCCH(NH2)CH2CH(CH3)2, has to be drawn and each enantiomer must be labelled as R or S.
Concept introduction: Enantiomers are the non-superimposable mirror images of each other. Optical isomers are given R and S configuration by sequence rule that is by assigning 1 to 4 priorities to the substituents attached at the chiral center on the basis of their
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Organic Chemistry
- High serum cholesterol levels often correlate with increased risk of heart attacks. The structure of cholesterol is shown below. Identify the chiral centers. How many chiral centers are there in cholesterol?arrow_forwardIf the asymmetric carbons in a molecule have been designated (2R,3S,5R), what will the designations be in the molecule’s enantiomer? What will the designations be in one of its diastereomers?arrow_forward● Identify the chiral center(s) and determine its absolute configuration. H₂C-arrow_forward
- Chiral Atoms: Determine how many chiral centers each molecule has and indicate wnich atoms are chiral by adding an asterisk (*) next to it. Then assign the chiral atom as either (R) or (S). Br Br он "Br "CHa Br Br Br Br CH3arrow_forwardCH CH 4. How many chiral centers does penicillin have? Penicilinarrow_forwardUse models (or drawings) to determine which of the following compounds are stable chiral molecules at room temperature. For those that are chiral, draw three-dimensional ( perspective) diagrams of the enantiomeric forms.arrow_forward
- The amino acid threonine has two chiral centers. The stereoisomer found in proteins has the configuration 2S,3R about the two chiral centers. Draw (a) a Fischer projection of this stereoisomer and (b) a three-dimensional representationarrow_forwardConsider the following molecules. Which of the following statements is correct? OH II OH но.. Question 6 options: 。 I and II are enantiomers 。 о I and III are enantiomers II and IV are diastereomers o III and IV are enantiomers ... III IVarrow_forwardWhich objects are asymmetric (have no plane of symmetry): (a) a circular clock face; (b) a football; (c) a dime; (d) a brick; (e) a hammer; (f) a spring?arrow_forward
- Determine whether three molecules—H2O, CH2BrCl, and CHBrClF—aresuperimposable on their mirror images; that is, are H2O, CH2BrCl, and CHBrClF chiral or achiral?arrow_forwardConsider compounds I, II, . How are I and II related to each other? (enantiomers, diastereomers, constitutional isomers, two conformers of the same molecule, not related). Explain. OH HO Br Brarrow_forwardAn example of a chiral center is a carbon that bears 4 different groups, and therefore has no symmetry. Select ALL of the molecules that contain a chiral center. CI 요 Br 8 Brarrow_forward
- General, Organic, and Biological ChemistryChemistryISBN:9781285853918Author:H. Stephen StokerPublisher:Cengage LearningOrganic And Biological ChemistryChemistryISBN:9781305081079Author:STOKER, H. Stephen (howard Stephen)Publisher:Cengage Learning,