[Review Topics] Calculate Sliain energy for the conformer pictured below, using strain energy increments from the lavie. Strain Energy for Alkanes Interaction / Compound kJ/mol H: H eclipsing H: CH3 eclipsing CH3 CH3 eclipsing gauche butane cyclopropane cyclobutane cyclopentane cycloheptane cyclooctane H CH3 CH3 4.0 5.8 11.0 3.8 115 110 26.0 26.2 40.5 (Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is case sensitive.) .H kcal/mol 1.0 1.4 2.6 0.9 27.5 26.3 6.2 6.3 9.7 [References] Previous Next

[Review Topics] Calculate Sliain energy for the conformer pictured below, using strain energy increments from the lavie. Strain Energy for Alkanes Interaction / Compound kJ/mol H: H eclipsing H: CH3 eclipsing CH3 CH3 eclipsing gauche butane cyclopropane cyclobutane cyclopentane cycloheptane cyclooctane H CH3 CH3 4.0 5.8 11.0 3.8 115 110 26.0 26.2 40.5 (Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is case sensitive.) .H kcal/mol 1.0 1.4 2.6 0.9 27.5 26.3 6.2 6.3 9.7 [References] Previous Next

Organic Chemistry: A Guided Inquiry

2nd Edition

ISBN:9780618974122

Author:Andrei Straumanis

Publisher:Andrei Straumanis

Chapter6: Alkanes & Alkenes

Section: Chapter Questions

Problem 4E: Consider the molecule 1-bromo-2-methylbutane. C3 and C4 should be drawn as Et as in theexample. This...

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[Review Topics] [References) Calculate strain energy for the conformer pictured below, using strain energy increments from the table. Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol H: H eclipsing 4.0 1.0 H: CH3 eclipsing 5.8 1.4 CH3 : CH3 eclipsing 11.0 2.6 gauche butane 3.8 0.9 cyclopropane 115 27.5 cyclobutane 110 26.3 cyclopentane 26.0 6.2 cycloheptane 26.2 6.3 cyclooctane 40.5 9.7 (Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is case sensitive.) CH, CH CH3 Next Previous H3C Save and E: 15 tv MacBook Air 80 DII DD F4 F5 F6 F7 F8 F9 F10 F11 F12 $ & ) + 4. 5 7 8. %3D Y [ 11 F J + || < co
Calculate strain energy for the conformer pictured below, using strain energy increments from the table. Strain Energy for Alkanes Interaction / Compound kJ/mol H: H eclipsing 4.0 H: CH3 eclipsing CH3 CH3 eclipsing gauche butane H Strain energy = cyclopropane cyclobutane cyclopentane cycloheptane cyclooctane (Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kJ/mol or kcal/mol. The answer is case sensitive.) H CH3 ball & stick V + labels 5.8 11.0 3.8 115 H kcal/mol 110 26.0 26.2 40.5 1.0 1.4 2.6 0.9 27.5 26.3 6.2 6.3 9.7
a) Draw all Newman projections of your molecule's conformations in which the CH3 group and the H of the CHY2 group are positioned 'ANTI' to each other. Be sure to put in the correct X and Y atoms, bonded to the correct C atoms, for your molecule. X = FY=I Conformations = 60 deg and - 180 deg 60 deg dihedral angle = - 179.987 deg 180 deg · - dihedral angle = 179.814 deg
Consider rotation about the indicated bond in the molecule below. Which Newman Projection formula best represents the most stable conformer of the molecule with respect to rotation about the indicated bond? [As noted below: there is no steric strain between -H and -Et that have a gauche, staggered relationship] H CH3 Br-C-C-CH₂CH3 H. H Br CH₂CH₂ 1 CH3 H CH3CH₂ H Br H₂C || H H₂C H Br H ||| Select one: OA. I O B. II O C. III O D. All conformers have identical energies. CH₂CH3 H NOTE CH3CH₂ H no steric strain
A Newman projection of methylcyclohexane is shown below. List the types of strain present in this conformation. H. H. H. H2 CH3 C H2 H.
One 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/mol
Which of the following is the correct Newman projection for the following compound as viewed down the indicat conformation shown? CO II O III O IV OV CH3 CH3 CH31 CH3 CI || Br Br H CH3 CH3 ||| Br CH3 CH3 IV CI Br CH3
Which of the following two conformations of cis-1-bromo-4-methylcyclohexane is more stable? Use the strain energy increments in the table below estimate the energy difference (a positive number) between them.
Calculate strain energy for the conformer pictured below, using strain energy increments from the table. Strain Energy for Alkanes Interaction / Compound kJ/mol kcal/mol H: H eclipsing 4.0 H: CH3 eclipsing 5.8 CH3 CH3 eclipsing 11.0 gauche butane 3.8 115 110 26.0 26.2 40.5 H₂C ball & stick Strain energy = cyclopropane cyclobutane cyclopentane cycloheptane cyclooctane (Calculate your answer to the nearest 0.1 energy unit, and be sure to specify units, kj/mol or kcal/mol. The answer is case sensitive.) H3C H CH3 1.0 + labels 1.4 2.6 0.9 27.5 26.3 6.2 6.3 9.7
Least stable conformer of 2,3-dicholorbutane in Newman projection form.
Which conformer(s) below represents highest energy staggered conformation of 2- methylbutane? H H CH3 CH3 I 1 || H ||| CH3 I and II CH3 Ø H₂C H II H CH3 H H CH3 H III CH3 CH3
Consider 3-methylpentane. Using a Newman projection formula, draw the most stable conformation of a molecule of this, sighting along the C₂- C3 bond. Compute the total strain energy for this conformation. Refer to strain energy values given below Strain energies with respect to atoms/groups bonded to C-C (one atom/group bonded to each C) H H eclipsed: 4 kJ/mol CH3 H eclipsed: 6 kJ/mol CH3 CH3 eclipsed: 11 kJ/mol CH3 CH3 gauche staggered: 3.8 kJ/mol Select one: OA. 3.8 kJ/mol OB. 10 kJ/mol O C. 11.4 kJ/mol O D. 7.6 kJ/mol OE. 15.2 kJ/mol