Essential Organic Chemistry, Global Edition
3rd Edition
ISBN: 9781292089034
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Chapter 5, Problem 39P
Given that the twist-boat conformer of cyclohexane is 5.3 kcal/mol higher in free energy than the chair conformer, calculate the percentage of twist-boat conformers present in a sample of cyclohexane at 25 °C. Does your answer agree with the statement made on page 103 about the relative number of molecules in these two conformations?
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Given that the free energy of the twist-boat conformer of cyclohexane is 5.3 kcal/mol greater than that of the chair conformer, calculate the percentage of twist-boat conformers present in a sample of cyclohexane at 25 °C. Does your answer agree with the statement made in Section 3.13 about the relative number of molecules in these two conformations?
Given that the free energy of the twist-boat conformer of cyclohexane is 5.3 kcal/mol greater than that of the chair conformer, calculate the percentage of twist-boat conformers present in a sample of cyclohexane at 25 °C.
Write the energy diagram corresponding to each conformer by writing the conformers (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 conformers.
Chapter 5 Solutions
Essential Organic Chemistry, Global Edition
Ch. 5.1 - Prob. 1PCh. 5.1 - Draw the structure for each of the following: a....Ch. 5.1 - What is each compounds systematic name?Ch. 5.3 - Prob. 4PCh. 5.3 - Prob. 5PCh. 5.3 - Prob. 7PCh. 5.4 - a. For which reaction in each set below will S be...Ch. 5.6 - Prob. 9PCh. 5.6 - How many different alkenes can be hydrogenated to...Ch. 5.6 - The same alkane is obtained from the catalytic...
Ch. 5.6 - Prob. 12PCh. 5.6 - Rank the following compounds in order from most...Ch. 5.7 - The rate constant for a reaction can be increased...Ch. 5.7 - Prob. 15PCh. 5.7 - Prob. 16PCh. 5.9 - Draw a reaction coordinate diagram for a two-step...Ch. 5.9 - Prob. 18PCh. 5.9 - Draw a reaction coordinate diagram for the...Ch. 5.10 - Which of the following parameters would be...Ch. 5 - What is each compounds systematic name?Ch. 5 - Draw the structure of a hydrocarbon that has six...Ch. 5 - Which of the following compounds is the most...Ch. 5 - Prob. 24PCh. 5 - Prob. 25PCh. 5 - Prob. 26PCh. 5 - Prob. 27PCh. 5 - Name the following:Ch. 5 - Prob. 29PCh. 5 - Prob. 30PCh. 5 - Prob. 31PCh. 5 - Prob. 32PCh. 5 - Prob. 33PCh. 5 - Prob. 34PCh. 5 - Prob. 35PCh. 5 - Name each of the following:Ch. 5 - Prob. 38PCh. 5 - Given that the twist-boat conformer of cyclohexane...Ch. 5 - a. The G for conversion of axial fluorocyclohexane...Ch. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Prob. 7PCh. 5 - Prob. 8PCh. 5 - Prob. 9PCh. 5 - Prob. 10P
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- From studies of the dipole moment of 1,2-dichloroethane in the gas phase at room temperature (25°C), it is estimated that the ratio of molecules in the anti conformation to gauche conformation is 7.6 to 1. Calculate the difference in Gibbs free energy between these two conformations.arrow_forwardThe chair conformer of fluorocyclohexane is 0.25 kcal/mol more stable when the fluoro substituent is in an equatorial position than when it is in an axial position. How much more stable is the anti conformer than a gauche conformer of 1-fluoropropane, considering rotation about the C-1¬C-2 bond?arrow_forward7. Draw the two chair conformations for the molecule below. Given the corresponding energy values, place the conformations in the appropriate boxes. Substituent AG° (eq→ ax) (kcal/mol) -CN -CH, 0.2 NEC 1.7 less stable chair more stable chair Clearly explain why the energy barrier associated with a nitrile group (-CN) moving from an equatorial position to an axial position is much lower than for a methyl group (-CH3).arrow_forward
- Draw structural formulas for the cis and trans isomers of hydrindane. Show each ring in its most stable conformation. Which of these isomers is more stable?arrow_forwardOn a cyclohexane ring, an axial carboxyl group has a conformational energy of 5.9 kJ (1.4 kcal)/mol relative to an equatorial carboxyl group. Consider the equilibrium for the alternative chair conformations of trans-1,4-cyclohexanedicarboxylic acid. Draw the less stable chair conformation on the left of the equilibrium arrows and the more stable chair on the right. Calculate DG0 for the equilibrium as written and calculate the ratio of the more stable chair to the less stable chair at 25°C.arrow_forwardGiven the cyclohexane chair conformation and four similar compounds, identify the relationship of each structure to the chair conformation. CH3 H3C, H H D How is Compound D related to the chair conformation? H3C. O It is a constitutional isomer. -CH3 O It is not an isomer. O It is a conformation isomer (conformer). O It is a stereoisomer.arrow_forward
- O B. 01 H₂C O. C. O A. O D. For the following structural formula, pick the structure that accurately represents its MOST STABLE conformation. Br CHS A Br CH3 B H₂CH CH3 CH3 Cill Br H₂C Br с CH₂3 H₂C Br. CH3 D hparrow_forwardWhich of the statements below correctly describes the chair conformations of trans-1,4-dimethylcyclohexane? * The lower energy chair conformation contains two axial methyl groups. The two chair conformations are of equal energy. The higher energy chair conformation contains one axial methyl group and one equatorial methyl group. O The higher energy chair conformation contains two axial methyl groups. The lower energy chair conformation contains one axial methyl group and one equatorial methyl group.arrow_forwardDraw all the possible conformations of trans- and cis-1,3-dimethylcyclobutane. Which of these conformations is the most stable conformation? Explain your answer. Discuss the type of strain(s) that affect the stability of these compounds.arrow_forward
- 4. Perform a conformational analysis on cyclohexane derivative I. Draw out both possible conformers and circle Using A, U, and G values estimate the energy difference (DG) the preferred (lowest energy) conformer between the two conformers and predict the approximate ratio of the two conformers at room temperature Hj C Br cyclohexane Iarrow_forward1) Below you are given the structures of the disaccharides lactose and trehalose. он он но он но но OH но но OH но он но но OH Lactose Trehalose a. Identify clearly the hemiacetal and acetal groups in these disaccharides and determine for each of these identified groups if they have a- or B-configuration.arrow_forwardUsing Newman projections and an energy diagram, draw all of the conformers of 1,1,2- tribromoethane and indicate the energy changes that arise from rotation about the C-C bond. You do not need the actual energy values, but you should label relative energies (energy minima and maxima).arrow_forward
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