EBK ORGANIC CHEMISTRY
8th Edition
ISBN: 8220102744127
Author: 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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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
EBK ORGANIC CHEMISTRY
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_forward4. possible equatorial axial relationships for the cis and trans for the compound CH2CH3 CH Which is the conformer? Explain (in not more than two lines in your own words)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
- Two VSEPR diagrams for Molecule 1 are given below. They are conformational isomers or molecules that place atoms differently in space because of the rotation of a single bond. H H H:O H:O Conformer 1 H H H Ö: Conformer 2 3. (a) Can you “see” either of the two conformational isomers (Conformer 1 or Conformer 2) in the line drawing that you drew for Molecule 1? Explain your answer.arrow_forwardPerspective drawings of Chair and Boat Conformers fo Cyclohexane (C6H12). Note it is impossible to place all the carbons in the same plane without straining the bonds. Take two opposite carbons and pull both of them up to make one conformation adn then pull one of them down to make the other conformation. Can you inercovert one conformer int othe other without breaking any bonds? Explain why these represent conformers and not isomers.arrow_forwardFrom 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_forward
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- 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_forwardWhat is the most stable conformation for trans-1,2-dichlorocyclohexane. Describe and explain brieflyarrow_forwardLooking alongC1−C2andC4−C5bonds, draw a Newman projection for each of the two chair conformations of trans 1,2-dimethylcyclohexane.arrow_forward
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