Consider the graph below, which is a plot of the relative energies of the various conformations of 2,3-dimethylbutane, viewed through the C2-C3 bond. The conformations corresponding to the angles 120° and 240° are: Relative energy 0° 60° 120° 180° 240° 300° 360° Angle of rotation A. eclipsed (one Me-Me and two Me-H eclipsed) B. eclipsed (one H-H and two Me-Me eclipsed) C. gauche D. anti-periplanar E. none of the above Enter Your Answer: A OB OC OD OE Using the same graph and answer choices from question 9, which conformations correspond to the angles 60° and 300⁰? Enter Your Answer: A OB O C OE

Consider the graph below, which is a plot of the relative energies of the various conformations of 2,3-dimethylbutane, viewed through the C2-C3 bond. The conformations corresponding to the angles 120° and 240° are: Relative energy 0° 60° 120° 180° 240° 300° 360° Angle of rotation A. eclipsed (one Me-Me and two Me-H eclipsed) B. eclipsed (one H-H and two Me-Me eclipsed) C. gauche D. anti-periplanar E. none of the above Enter Your Answer: A OB OC OD OE Using the same graph and answer choices from question 9, which conformations correspond to the angles 60° and 300⁰? Enter Your Answer: A OB O C OE

Organic Chemistry

8th Edition

ISBN:9781305580350

Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Publisher:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote

Chapter16: Aldehydes And Ketones

Section: Chapter Questions

Problem 16.71P

See similar textbooks

Similar questions

Use strain energy increments in the OWL Table Reference (see References button, Strain Energy Increments) to calculate the energy difference between the two chair conformations of the compound below. Specify substituent positions (axial or equatorial) in the more stable chair. Estimate the percent of the more stable chair at equilibrium at 25°C. (To determine the percent of the more stable chair at equilibrium, first calculate Keq, and then use this value to find the percentage.)
Given that the free energy of the twist-boat conformer of cyclohexane is 5.3 kcal/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?
6. From the perspective of viewing down the C2-C3 bond, draw the Newman projection of the most stable conformation of 2, 3-dimethylbutane.
What is the value in kJ/mol, of the lowest energy trnasition above? a.) 545 b.) 444 c.) 320 d.) 266
Consider rotation around the C2–C3 single bond of 2-methylpentane. Using the Newman projection templates shown below, (i) draw all possible conformations (ii) arrange these four conformations in the order most stable to least stable
1. draw the most stable chair form of (1R,2R)-1-ethyl-2-methylcyclohexane 2. in the following chiral compound, the stereogenic center is denoted by C*. assign the priorities to the groups attached to C* using the Cahn-Ingold-Prelog system. please show your work (the image goes with question 2)
Draw the bond-line formula of 3,4-dimethylhexane. Is geometric isomerism observed in 3,4-dimethylhexane? What structural features must be present for stereoisomers to exist? (4 marks) (b) (1) Using Fischer projection, draw all the stereoisomers of 3-chloro-2-hydroxypentanoic acid. (4 marks) (ii) Assign the chiral centre(s) with R/S configurations in part (b)(i). Indicate which are enantiomers, diastereomers and meso compounds (if any).
Show caluculations with the possible answer being : A)3.67 B)1.43 C)3.02 D)3.86 E) none of these
Draw the alternating and eclipsed conformations of 1-bomo-2-chloroethane rotating with respect to the C1-C2 bond according to thenumbering for nomenclature purposes. Place theconformations in ascending order of stability.
Consider 2-methylbutane (isopentane). Looking along the C2-C3 bond: a) Draw a Newmann projection of the most stable conformation. b) Draw a Newmann projection of the least stable conformation. c) Indicate the gauche form. d) State the eclipsed Newmann projection. An eclipsed CH3-CH3 interaction has an energy value of 11 kJ / mol and a gauche CH3-CH3 interaction has an energy value of 3.8 kJ / mol, the data are given if you need them.
Build 2‑bromoethan‑1‑ol and its mirror image. 2‑Bromoethan‑1‑ol, which has condensed structural formula BrCH2CH2OH, is also called 2‑bromoethanol. a. Draw the structures of 2‑bromoethan‑1‑ol and its mirror image using wedges and dashed wedges. b. How many stereocentres are present in 2‑bromoethan‑1‑ol? c. Are the molecules chiral? Do they contain planes of symmetry? Briefly explain the evidence for your answer.
Draw Newman projections for all the additional eclipsed and staggered conformations B, C, D, E and F, arising from rotation about the C1-C2 bond of 1,1-dichloropropane. Start with Newman projection A and rotate the front carbon clockwise in 60o steps in order to generate the other Newman projections. Sketch the energy profile diagram starting with Newman projection A, showing the relative energy levels of projections B through F. Write the letter designation of the conformation under each appropriate section of the energy profile diagram.