Organic Chemistry (8th Edition)
8th Edition
ISBN: 9780134042282
Author: Paula Yurkanis Bruice
Publisher: PEARSON
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Chapter 5, Problem 64P
Given that the free energy of the twist-boat conformer of cyclohexane is 5.3kcal/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?
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Why are these two conformational isomers? I was under the impression that in molecules with only sigma bonds, the bonds can rotate freely, and so the placement of the chlorines wouldn't matter?
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Hello,
I was reading an answer from the book Organic Chemistry by Brown et al. The question is 2.51 "Draw alternative chair conformations for each substituted cyclohexane and state which chair is more stable." There are then 4 cyclohexanes (labeled a-d). For the "a" cyclohexane, the substituents are arranged as a combination of axial and equatorial in both chair conformations. However, for the "b," "c," and "d," cyclohexanes one chair has only equatorial substituents, and the other chair has only axial substituents. Why is the "a" chair conformation different?
https://www.bartleby.com/solution-answer/chapter-2-problem-251p-organic-chemistry-8th-edition/9781305580350/draw-alternative-chair-conformations-for-each-substituted-cyclohexane-and-state-which-chair-is-more/4532cd91-c341-11e9-8385-02ee952b546e
Chapter 5 Solutions
Organic Chemistry (8th Edition)
Ch. 5.1 - What is the molecular formula for each of the...Ch. 5.1 - Prob. 4PCh. 5.1 - Determine the degree of unsaturation and then draw...Ch. 5.1 - Prob. 6PCh. 5.2 - What is each compounds systematic name?Ch. 5.2 - Prob. 8PCh. 5.2 - Draw the structure for each of the following: a....Ch. 5.3 - How many carbons are in the planar double-bond...Ch. 5.3 - Prob. 12PCh. 5.5 - Prob. 13P
Ch. 5.5 - Prob. 14PCh. 5.5 - Prob. 16PCh. 5.5 - Prob. 17PCh. 5.6 - a. Which of the monosubstituted cyclohexanes in...Ch. 5.6 - a. Calculate the percentage of isopropylcylohexane...Ch. 5.6 - a. for which reaction in each set will S be more...Ch. 5.6 - a. For a reaction with H = 12 kcal/ mol and S =...Ch. 5.8 - Prob. 23PCh. 5.9 - Prob. 24PCh. 5.9 - How many different alkenes can be hydrogenated to...Ch. 5.9 - The same alkane is obtained from the catalytic...Ch. 5.9 - Prob. 27PCh. 5.9 - Rank the following compounds from most stable to...Ch. 5.10 - Prob. 29PCh. 5.10 - Prob. 30PCh. 5.11 - The rate constant for a reaction can be increased...Ch. 5.11 - Prob. 33PCh. 5.11 - a. Which reaction has a greater equilibrium...Ch. 5.12 - Draw a reaction coordinate diagram for a two-step...Ch. 5.12 - a. Which step in the reaction coordinate diagram...Ch. 5.12 - Draw a reaction coordinate diagram for the...Ch. 5.13 - Prob. 38PCh. 5 - What is each compounds systematic name?Ch. 5 - Prob. 40PCh. 5 - Draw the structure of a hydrocarbon that has six...Ch. 5 - Draw the condensed structure for each of the...Ch. 5 - Prob. 43PCh. 5 - Prob. 44PCh. 5 - Prob. 45PCh. 5 - Name the following:Ch. 5 - Prob. 47PCh. 5 - Prob. 48PCh. 5 - Prob. 49PCh. 5 - In a reaction in which reactant A is in...Ch. 5 - Which bond is stronger? Briefly explain why.Ch. 5 - Prob. 52PCh. 5 - Prob. 53PCh. 5 - By following the curved red arrows, draw the...Ch. 5 - Prob. 55PCh. 5 - Prob. 56PCh. 5 - Draw structures for the following: a....Ch. 5 - Prob. 58PCh. 5 - a. Which of the following reactions has the larger...Ch. 5 - Prob. 60PCh. 5 - a. What is the equilibrium constant for a reaction...Ch. 5 - Prob. 62PCh. 5 - Prob. 63PCh. 5 - Given that the free energy of the twist-boat...Ch. 5 - Prob. 65PCh. 5 - Prob. 1PCh. 5 - Prob. 2PCh. 5 - Prob. 3PCh. 5 - Prob. 4PCh. 5 - Prob. 5PCh. 5 - Prob. 6PCh. 5 - Draw curved arrows to show the movement of the...Ch. 5 - Prob. 8PCh. 5 - Prob. 9PCh. 5 - Prob. 10P
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- Following are structural formulas for 1,4-dioxane and piperidine. 1,4-Dioxane is a widely used solvent for organic compounds. Piperidine is found in small amounts in black pepper (Piper nigrum). (a) Complete the Lewis structure of each compound by showing all unshared electron pairs. (b) Predict bond angles about each carbon, oxygen, and nitrogen atom. (c) Describe the most stable conformation of each ring and compare these conformations with the chair conformation of cyclohexane.arrow_forwardRank the conformations of 1,2-dichloroethane in terms of stability. Draw a plot of potential energy versus rotation for the C-C bond in 1,2-dichloroethane. Do your calculations for conformations of 1,2-dichloroethane agree with the plot you predict?arrow_forwardOne of the chair conformations of cis-1-chloro-3-methylcyclohexane is more stable than the other by 15.5 kJ/mol. Use this, and the table below, to estimate the energy cost of a 1,3-diaxial interaction between a chlorine atom and a methyl group. 1,3-Diaxial Strain Energies for Monosubstituted Cyclohexanes kJ/mol Substituent Substituent kJ/mol -NH2 -CN, cyano 0.4 2.95 -F 0.5 -COOH 2.95 -C=CH, ethynyl 0.85 -CH=CH2 3.55 -CH3 -I 0.95 3.64 -CH2CH3 -Cl 3.65 1.1 -CH(CH3)2 1.2 4.5 -Br -C(CH3)3 10.5 -ОН 1.95 -CGH5 6.3 (Round your answer to one decimal place.) kJ/molarrow_forward
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- The energy difference between a tert-butyl group going from equatorial to axial in a cyclohexane is 18.3 kJ/mol. When two of the carbon atoms are replaced with oxygen atoms (molecule B) the energy difference between the two chair conformations drops to 5.9 kJ/mol. Explain this difference. (Hint: Consider what makes putting groups axial unfavorable).arrow_forwardGibbs free energy differences between axial-substituted and equatorial-substituted chair conformations of cyclohexane were given in Table 2.4. Q. Calculate the ratio of equatorial to axial tert-butylcyclohexane at 25°C.arrow_forwardConsider a Newman Projection for 2,2,3-trimethylbutane. Which of the following is true? The least stable conformation of the molecule has 22 kJ/mol of straih energy. The least stable conformation has 28 kJ/mol of torsional strain energy. The most stable conformation of the molecule has two gauche butane interactions with 7.6 kJ/mol of strain energy. The most stable conformation of the molecule has no torsional strain interactions. O O O Oarrow_forward
- Draw Newman projections for the gauche and anti conformations of 1,2-dichloroethane (ClCH2CH2Cl).arrow_forwardConsider 1,2-dimethylcyclohexane.Q: Draw the two possible chair conformations for the trans isomer. Whichconformation, if either, is more stable?arrow_forwardAcetylcholine is a neurotransmitter in the central nervous system in humans. Sighting along the C-C bond, draw Newman projection formulas for all the eclipsed and staggered conformers of acetylcholine. Which among the conformers is the least stable? The most stable? Plot a conformational analysis for these conformers.arrow_forward
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