For 3-bromo-1-iodo-5-methylhexane AND 3-bromo-2,4-dimethylpentane, draw Fischer projections of the S-stereoisomer placing the 4 and 2 positions on the vertical line.
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For 3-bromo-1-iodo-5-methylhexane AND 3-bromo-2,4-dimethylpentane, draw Fischer projections of the S-stereoisomer placing the 4 and 2 positions on the vertical line.
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- 3) a) Using Newman projections, draw the lowest and highest energy conformers of 2- methylbutane, with respect to rotation around the C2-C3 bond. b) What is the barrier to rotation (difference in energy between lowest and highest) around the C2-C3 bond of 2-methylbutane?Draw the Newman projections of the conformational isomers of 1,2-dibromoethane and rank them according to the potential energy increase.For 1-ethyl-2-methylcyclopentane: draw all stereoisomers, and identify their stereochemical relationships. Make sure to label each compound with the R/S designations for each chiral carbon.
- Draw the sold/dashed wedge structures (skeletal structure) for all stereoisomers of 3,4-dichloro 4-methylhexane. Label each structure with the proper R/S notation Label enantiomers and diastereomersDraw the Newman projection of the methylcyclohexane looking along the C1 – C2 and C5 – C4 bonds.Write the energy diagram corresponding to each conformer by writing the confomers (and Newman projection formulas) formed by the rotation of the bond between the carbon 3 and 4 (C3 and C4) of the 2-methylpentane. Indicate the most stable and unstable confomers.
- Gibbs free energy differences between axial-substituted and equatorial-substituted chair conformations of cyclohexane were given in Table 2.4. (a) Calculate the ratio of equatorial to axial tert-butylcyclohexane at 25C. (b) Explain why the conformational equilibria for methyl, ethyl, and isopropyl substituents are comparable but the conformational equilibrium for tert-butylcyclohexane lies considerably farther toward the equatorial conformation.Following is a planar hexagon representation of L-fucose, a sugar component of the determinants of the A, B, O blood group typing. For more on this system of blood typing, see Chemical Connections: A, B, AB, and O Blood Group Substances in Chapter 25. (a) Draw the alternative chair conformations of L-fucose. (b) Which of them is more stable? Explain.On the left is a stereorepresentation of glucose (we discuss the structure and chemistry of glucose in Chapter 25). (a) Convert the stereorepresentation on the left to a planar hexagon representation. (b) Convert the stereorepresentation on the left to a chair conformation. Which substituent groups in the chair conformation are equatorial? Which are axial?
- 2. Assign the stereochemical configuration of the selected carbon-carbon double bonds (E, Z or N (not a stereocenter)) that are indicated by the arrows. a) HN H,, H3CO HO H HHow many asymmetric centers are present in a molecule of 2,4,6-trimethylheptane? please answer meDraw the Newman Projection for the highest and lowest energy conformations of 1-iodo butane, as viewed down the bond between the second and third carbons. Label each projection as high or low energy and describe each projection.
