4.41 Which compound would you expect to be the more stable: cis-1,2-dimethylcyclopropane ortrans-1,2-dimethylcyclopropane? Explain your answer.
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4.41 Which compound would you expect to be the more stable: cis-1,2-dimethylcyclopropane or
trans-1,2-dimethylcyclopropane? Explain your answer.
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- 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.See image belowWhich will be more stable, cis or trans-1,4-tert-butylcyclohexane? Explain by drawing their structures?
- 7.40 a. Suggest an explanation for the fact that 1-methylcyclopropene is some 42 kJ/mol (10 kcal/mol) less stable than methylenecyclopropane. -CH3 is less stable than CH2 1-Methylcyclopropene Methylenecyclopropane b. On the basis of your answer to part (a), compare the expected stability of 3-methylcyclopropene with that of 1-methylcyclopropene and that of methylenecyclopropane.2.35 Write a structural formula for each of the following compounds: (a) 6-Isopropyl-2,3-dimethylnonane (b) 4-tert-Butyl-3-methylheptane (c) 4-Isobutyl-1,1-dimethylcyclohexane (d) sec-Butylcycloheptane (e) CyclobutylcyclopentaneHow many isomers (structural, geometric, and stereo) have the formula C5H10, and have "cyclo" in their name? (i.e. they contain a ring) 4 06 07 5
- 10. Which of the following compounds is 2-methyl-3-(1-methylethyl)hexane? CH3 CH₂-CH-CH-CH₂-CH₂-CH₂ CH-CH3 CH3 CH3 CH₂-CH-CH-CH₂-CH₂-CH₂ CH-CH₂-CH₂ CH3 CH₂ (d) (a) 4-methylnaphthalene (b) 2-methylnaphthalene (c) 1-methylnaphthalene (d) 2,3-benzenetoluene CH3 CHy-CH-CH-CH, CH, CH-CH₂ CH3 11. What is the best name for the following compound? O CH3 CH3 CH3-CH-C-CH, CH, CH3 CH₂-CH3 12. Which of the following symbols is normally used to represent an alpha particle? (a) 'p (b) "He (c) je (d) 4A (e) +jeb) C8H13Bг2Cl2O2 Isomer #1: Name of Isomer #1: Name of Isomer #2: Name of Isomer #3: Isomer #2: Isomer #3:Rank the following compounds from most stable to least stable: trans-3-hexene, cis-3-hexene, cis-2,5-dimethyl-3-hexene, cis-3,4-dimethyl-3-hexene
- 1) Azulene, bicyclo[5.3.0] decapentaene, is an beautiful blue colored hydrocarbon with a large dipole moment (for a hydrocarbon). Draw resonance structures that could explain the large dipole moment. Azulene2. Draw the most stable conformation of the following: (a) trans-1-butyl-3-methylcyclohexane (b) trans-1-t-butyl-4-methylcyclohexane Which isomer is more stable? Why?(8) Consider the compound trans-1,3-di-tert-butylcyclohexane. a. Draw the two chair conformers expected for the compound. b. What is the most stable conformer of the compound? Draw it if it is not already drawn.
