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- Consider 1-bromo-2-methylpropane and draw the following. (a) The staggered conformation(s) of lowest energy (b) The staggered conformation(s) of highest energyFill in the blanks: cis-1,3-Dimethylcyclohexane has two different chair conformations: one withboth methyl groups in __________ positions and one with both methyl groups in ____________ positions.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.
- Draw Newman's projections along the C3¬C4 bond to show the most stable and least stable conformations of 3-ethyl-2,4,4-trimethylheptane.trans-1-chloro-3-methylcyclohexane as well as a chair structure.Use a Newman projection about the indicated bond to draw the most stable conformer for each compound. (a) 3-methylpentane about the C2¬C3 bond
- 5. Draw the top view and the side chair view of the molecule. Can cis and trans notation be used? Why or why not? 0 2 KWhen cyclohexane is substituted by an ethynyl group, -C=CH, the energy difference between axial and equatorial conformations is only 1.7 kJ (0.41 kcal)/mol. Compare the conformational equilibrium for methylcyclohexane with that for ethynylcyclohexane and account for the difference between the two.Draw 1,2,3,4,5,6-hexamethylcyclohexane with the methyl group (a) in equatorial positions.
