1. Sketch an approximate energy diagram that represents the 360° rotation about the C2-C3 bond in 2- bromopentane. Draw ALL 7 Newman Projections. BE SURE TO LABEL STRUCTURES ECLIPSED AND STAGGERED. Please draw this on a separate sheet of paper (or electronically). 3 5

1. Sketch an approximate energy diagram that represents the 360° rotation about the C2-C3 bond in 2- bromopentane. Draw ALL 7 Newman Projections. BE SURE TO LABEL STRUCTURES ECLIPSED AND STAGGERED. Please draw this on a separate sheet of paper (or electronically). 3 5

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

please help with the highlighted problem 2: Follow the instructions in each column. Hint for the last column: draw it with a wedge and again with a dash – which gives the correct configuration?
Make sure all requirements are filled drawing the isomer. from a to f
10. Provide a structure of an isomer that has the molecular formula C5H8O2 and fits the criteria described below. Note that all of the structures must be neutral and not have any formal charges on any of the atoms. a) Contains an ester and an alkene b) A chiral compound that contains a ring, ether and ketone. c) Contains an alcohol and an alkyne. d) A meso compound that contains two alcohols.
Name: Expt. 4: Molecular Models: Stereoisomers Laboratory Work – Be sure and answer all questions embedded in the text. Shown below is a representation of 2-bromopropane. a. Draw the mirror image of this representation. b. Build a model of each structure. Are the two structures superimposable? 1. 1o fro c. Look carefully at one of your models. Do you see a mirror plane of symmetry in the molecule? d. If so, draw where it is or describe in words what the plane is. er an steren somers H. CH3 . -Br CH3 mirror plane
a. 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 b. Specify substituent positions (axial or equatorial) in the more stable chair. c. 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.) CH3 CH3 Answers: a. The energy difference is b. In the more stable chair: • The phenyl group is in the • The isopropyl group is in the | kJ/mol. position. position. c. At 25°C the equilibrium percent of the more stable chair conformation is approximately [
5. A trans-1-chloro-4-isopropyleyclohexane must have both group either axial or equatorial. Explain and identify which one is more stable. (Must show drawing as well)
4. For the structure shown below, Part A) Draw the Newman projections and 3-D sawhorse structures corresponding to the lowest and highest energy conformations for rotation around the C2-C3 bond. Draw the Newman projections looking FROM THE C2 CARBON TO THE C3 CARBON (i.e. with the C2 carbon in the "front"). Part B) Determine the energy difference between the lowest and highest conformations, and be sure to clearly show each energy contribution that you are including in your calculation. Lowest Energy Conformation 3-D sawhorse Newman ECLIPSING Interactions Energy Difference: AB Energy kcal/mol H/H 1.0 H/Me 1.4 H/Et 1.5 H/Pr 1.6 H/1-Bu 3.0 Me / Me 2.6 Me/Et 2.7 Me/i-Pr 3.0 GAUCHE A Interactions Energy kcal/mol Me / Me 0.9 Me / Et 0.95 Me/i-Pr 1.1 Me/t-Bu 2.7 Et/Et 1.1 Et/i-Pr 1.6 Et/t-Bu 3.0 i-Pr/i-Pr 2.0 Highest Energy Conformation 3-D sawhorse Newman 1
1) For the molecules below draw a Newman projection looking down the indicated bond (1→2). Your Newman projection needs to be in the same conformation that shown in the structural formula. a) b) Br, 1 2 H H view HO view
What is the IUPAC name for the following compound? A. (2E, 4Z)-2,4-hexadiene B. (2E, 4Z)-1,4-dimethyl-1,3-butadiene (2Z, 4Z)-1,4-dimethyl-1,3-butadiene (2Z, 4Z)-2,4-hexadiene ABCD C. D. MacBook Air
Which of the following compounds contain stereocenters? Also, what are stereocenters?
Draw a structural formula of the SR configuration of the compound shown below. HO CH3 S -NHCH3 R H3C ephedrine • Use the wedge/hash bond tools to indicate stereochemistry where it exists. • Include H atoms at chiral centers only. • If a group is achiral, do not use wedged or hashed bonds on it. * #[ ] در ?
1. Make a qualitative plot of 4-ethyl-2-methylhexane showing the energy changes that arise from a 360° rotation about the C3-C4 bond. You do not need the actual numerical values of the energy changes, but you should label all maxima and minima with the appropriate Newman projections.