Recitation Discussion Problem: USE MOLECULAR MODELS and bring them to recitation. Molecule: 2-methylpentane 1. Draw in bond-line notation. Number all carbons in the pentane backbone. Identify carbons #2 -3. Circle these on your bond-line structure. 2. Draw the Newman projections for all 60° rotations looking down carbons #2-3- starting with the eclipsed conformation. Make sure to keep the front carbon static only rotate the back carbon. Use models. You should draw seven Newman projections in total, 4 eclipsed, 3 staggered. The first and last Newman projections (0° and 360°) are identical. See Karty Chapter 4 for examples. 3. Identify the major interactions occurring in each conformer (which bonds are eclipsed; which have gauche interactions, etc.) and RANK associated energy of eclipsed in terms of size of group. Greater energies are involved for larger eclipsed groups. See Karty Chapter 4 energy diagram examples. 4. Plot these conformations on an Energy Diagram (similar to Karty Figure 4-7) for all rotations starting with the eclipsed. You should have an energy point for each of the conformations/Newman projections. Connect the points with a smooth curve.

Recitation Discussion Problem: USE MOLECULAR MODELS and bring them to recitation. Molecule: 2-methylpentane 1. Draw in bond-line notation. Number all carbons in the pentane backbone. Identify carbons #2 -3. Circle these on your bond-line structure. 2. Draw the Newman projections for all 60° rotations looking down carbons #2-3- starting with the eclipsed conformation. Make sure to keep the front carbon static only rotate the back carbon. Use models. You should draw seven Newman projections in total, 4 eclipsed, 3 staggered. The first and last Newman projections (0° and 360°) are identical. See Karty Chapter 4 for examples. 3. Identify the major interactions occurring in each conformer (which bonds are eclipsed; which have gauche interactions, etc.) and RANK associated energy of eclipsed in terms of size of group. Greater energies are involved for larger eclipsed groups. See Karty Chapter 4 energy diagram examples. 4. Plot these conformations on an Energy Diagram (similar to Karty Figure 4-7) for all rotations starting with the eclipsed. You should have an energy point for each of the conformations/Newman projections. Connect the points with a smooth curve.

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...

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b. Draw a Newman projection of the given compound H viewed from C-2 to C-3 orientated according to the first template. Then use the Newman projection to demonstrate the most stable conformation around the C2-C3 bond according to the second template. (Hint: Order of decreasing group size 'Pr > CH2CH3 > CH3 > OH > Br > H] NH2 Me Ме H 'Pr Given conformation Most stable conformation
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a) Sighting down the C3-C4 bond, draw the gauche (60 degrees) and anti (180 degrees) Newman projections of 2,4-dimethylhexane. b) Circle the conformation that you drew that is lower energy.
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[Review Topics] [References) Use the References to access important values if needed for this question. 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 below. 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 K, and then use this value to find the percentage.) он (in isopropanol) Answers: kJ/mol. a. The energy difference is b. In the more stable chair: • The hydroxyl group is in the | • The chloro group is in the | c. At 25°C the equilibrium percent of the more stable chair conformation is approximately | position. |position. An error has been detected in your answer. Check for typos, miscalculations etc. before submitting your answer. Submit Answer Retry…
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SEE PHOTO: Draw the enantiomer of the molecule shown below. Use a dash or wedge bond to indicate stereochemistry of substituents on asymmetric centers, where applicable
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6. Using Newman projections, draw each of the following molecules in its represented conformation with respect to the bond indicated. Use squares to type in appropriate substitution. a) Bond view C2-C3 H₂C % CH3