a) Calculate the difference in the Gibbs free energy between the second and first conformation including the algebraic sign. kJ/mol b) Given your value in (a), calculate the percent of the chair, indicated as B, presented in an equilibrium mixture of the conformers at 25°C. %-
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Q: chair conformation.
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- The diaxial conformation of cis-1, 3-dimethylcyclohexane is approximately 23 kJ/mol (5.4 kcal/mol) less stable than the diequatorial conformation. Draw the two possible chair conformations, and suggest a reason for the large energy difference.What is the most stable chair conformation of the 4-methoxy-1,2-dimethylcyclohexane structure given below ?Compounds 1 and 2 were prepared, and the difference in their heats of combustion was found to be 17.2 kJ/mol (J. Am. Chem. Soc. 1961, 83, 606-614): H H 1 Shown below are the lowest-energy conformations of compounds 1 and 2. Identify which drawing matches which compound, and identify which compound has the larger heat of combustion. H H H H |||I 2 H 4 H H The first drawing is compound 1, and compound 1 has a larger heat of combustion because it is the less stable compound. O The first drawing is compound 2, and compound 2 has a larger heat of combustion because it is the less stable compound. The first drawing is compound 2, and compound 2 has a larger heat of combustion because it is the more stable compound. The first drawing is compound 1, and compound 1 has a larger heat of combustion because it is the more stable compound.
- For each organic compound in the table below, enter the locant of the highlighted side chain. CH3 CH₂ CH₂ H CH3 · C CH₂- CH CH3 CH₂ CH3- compound CH₂ I CH₂- CH CH | CH₂ CH3- — - CH₂ | CH₂-C. CH3 | — ぎーぎ CH3 locant of highlighted side chain 0 0Identify the most stable chair conformation of the most stable isomer of 1,4-diethylcyclohexane. II II IV | || II IVProvide the least stable chair conformation of cis-1-hydroxy-4-isopropylcyclohexane
- Consider compound Q shown below (trimethylcyclohexane isomer). compound Q Which of the following is the most stable conformation of compound Q? I ||| CH3 Select one: O A. II OB. I O C. III O. D. IV H CH3 H CH3 H H- CH3 CH3 H CHS ||| H IV CH3 H CH₁ CH3 fff, H CH3 CH3 CH3g and lea X rilm/takeAssignment/takeCovalentActiviolocator=assignment-take TReferences) The cyclohexane derivativeshown exists primarily in the more stable of the two available chair conformations. Give the position, axial or equatorial, of each of the three groups shown in the more stable chair conformation. If a group divides its time equally between axial and equatorial positions, indicate this with ax/eq. The table of "Axial Strain Energies for Monosubstituted Cyclohexanes" found in the "Strain Energy Increments" section of the Reference tool is useful for answering this question. a CI "CH2CH3 Group a is Group b is Group c is Submit Answer Retry Entire Group 9 more group attempts remaining 8:32 PM 5/9/2021 hp 16 10 47 f10 f12 insert prt sc de & backspaceDeduce the energy difference betweetn the conformers of compound X by referring to the table below. (i) ÇII3 Compound X H,C H;C Support your answer hy drawing the conformer(s) involved, and show the calculations to obtain the energy difference. Energy cost by: He>CH3 eclipsed 1,3-diaxial (He>CH,) strain 1,3-diaxial (CH3>CH;) strain Energy (kJ mol) 6.0 3.8 15.4 (ii) Identify which of these conformers give the most and the least stable conformations.
- Give the most stable conformation for (1S, 2S)-1-methoxy-2-chlorocyclohexane.what is the most stable conformation of (1R, 2S, 5R)-1,2,5-trimethylcyclohexaneQ8 Conformational Analysis of Cycloalkanes In this question you will look at the conformations of the following molecule: CH3 C В F CH3 D -E A H3C F I II Energy Costs for Interactions in Alkane Conformers: Computed Energy Cost (kJ/mol)* 3.8 Interaction H+H eclipsed H+CH3 eclipsed CH3+CH3 eclipsed CH3+CH3 gauche H»CH(CH3)2 gauche H CH(CH:)2 eclipsed CH3+CH(CH3)2 gauche CH3+CH(CH3)2 eclipsed HeC(CH:)3 eclipsed CH3+C(CH3)3 gauche CH3+C(CH:)3 eclipsed H+I eclipsed I+CH3 gauche I+CH3 eclipsed "Values computed with Gaussian09 using B3LYP/6-31G(d) for structure optimization and B3LYP/6-311+G(2df,3p) for the conformation energy. The calculations were performed in the gas phase (no solvent). *This result for t-butyl is a bit peculiar given that the value is less than that for isopropyl, but there is an explanation that I can tell you about in office hours! 4.8 12.6 3.7 (0.0) 3.1 3.6 17.3 2.8 13.6 18.7 6.7 1.2 15.5 Steric Strain in Monosubstituted Cyclohexanes: 1,3-Diaxial strain Y (kJ/mol)…