Organic Chemistry (9th Edition)
9th Edition
ISBN: 9780321971371
Author: Leroy G. Wade, Jan W. Simek
Publisher: PEARSON
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Question
Chapter 3.16B, Problem 3.32P
Interpretation Introduction
Interpretation: The conformation that results during the interconversion of cis and trans decalin using the model has to be stated.
Concept introduction: The cycloalkane with molecular formula
To determine: The conformation that results during the interconversion of cis and trans decalin using the model.
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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
What is the most stable chair conformer for the compound shown (left)? Use the labels indicated
in the template structure (right) and the dropdown menu to indicate the correct location (a-h) of
the three substituents. Note that the template has the location of two hydrogen atoms (H)
indicated.
H.
(H3C);C/I.
CH2CH3
-NH
hi
a
Location of 'CH3CH2- is
d.
Location of (CH3)3C- ' is
g
Location of 'CN' is
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
Chapter 3 Solutions
Organic Chemistry (9th Edition)
Ch. 3.2 - Using the general molecular formula for alkanes:...Ch. 3.3B - Name the following alkanes and haloalkanes. When...Ch. 3.3B - Write structures for the following compounds. a....Ch. 3.3B - Provide IUPAC names for the following compounds....Ch. 3.3B - Prob. 3.5PCh. 3.3B - Prob. 3.6PCh. 3.3B - Prob. 3.7PCh. 3.3B - Draw the structures of the following compounds. a....Ch. 3.3B - Without looking at the structures, give molecular...Ch. 3.4C - Prob. 3.10P
Ch. 3.7B - Prob. 3.11PCh. 3.7C - Draw a graph similar to Figure 3-9, of the...Ch. 3.8B - Draw a graph similar to Figure 3-11, of the...Ch. 3.9 - Draw a perspective representation of the most...Ch. 3.10C - Give IUPAC names for the following compounds.Ch. 3.10C - Draw the structure and give the molecular formula...Ch. 3.11 - Which of the following cycloalkanes are capable of...Ch. 3.11 - Give IUPAC names for the following cycloalkanes.Ch. 3.12B - The heat of combustion of...Ch. 3.12C - Prob. 3.20PCh. 3.13B - The cyclohexane chair shown in Figure 3-22 has the...Ch. 3.13B - Draw 1,2,3,4,5,6-hexamethylcyclohexane with all...Ch. 3.14 - Prob. 3.23PCh. 3.14 - Prob. 3.24PCh. 3.14 - Draw the most stable conformation of a....Ch. 3.15 - Prob. 3.26PCh. 3.15 - a. Draw both chair conformations of cis-1...Ch. 3.15 - Prob. 3.28PCh. 3.15A - Draw the two chair conformations of each of the...Ch. 3.15B - Draw the most stable conformation of a....Ch. 3.16A - Name the following compounds.Ch. 3.16B - Prob. 3.32PCh. 3 - Prob. 3.33SPCh. 3 - Prob. 3.34SPCh. 3 - 3-35 a. Draw and name the five cycloalkane...Ch. 3 - Draw the structure that corresponds with each...Ch. 3 - Each of the following descriptions applies to more...Ch. 3 - Write structures for a homologous series of...Ch. 3 - Prob. 3.39SPCh. 3 - Construct a graph, similar to Figure 3-11, of the...Ch. 3 - The following names are all incorrect or...Ch. 3 - In each pair of compounds, which compound has the...Ch. 3 - There are eight different five-carbon alkyl...Ch. 3 - Use a Newman projection about the indicated bond...Ch. 3 - a. Draw the two chair conformations of...Ch. 3 - Draw the two chair conformations of each compound,...Ch. 3 - Using what you know about the conformational...Ch. 3 - Prob. 3.48SPCh. 3 - Draw Newman projections along the C3C4 bond to...Ch. 3 - Prob. 3.50SPCh. 3 - The most stable form of the common sugar glucose...Ch. 3 - This is a Newman projection of a substituted...
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- Draw a Newman projection, similar to Figure 3-25, down the C1¬C6 bond in the equatorial conformation of methylcyclohexane. Show that the equatorial methyl group is also anti to C5.arrow_forwardhelp me pleasearrow_forward4. For the following structures, draw both possible chair conformations, using a ring flip to go from one to the other, and circle the one that is most stable/lowest energy. (Hint: Use Table 4.8 in Klein.) Show all groups, including hydrogen atoms, attached to the cyclohexane ring. А. Me Me Et В. Et t-Bu Etarrow_forward
- For the 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. 2,3-dimethylpentane ECLIPSING Interactions AB Energy kcal/mol H/H 1.0 H / Me 1.4 H/Et 1.5 H/i-Pr 1.6 H/t-Bu 3.0 Me / Me 2.6 Me / Et 2.7 Me/i-Pr 3.0 GAUCHE A. Interactions Me / Me Me / Et Me / i-Pr Me / t-Bu Et / Et Et / -Pr Et/t-Bu i-Pr/i-Pr B Energy kcal/mol 0.9 0.95 1.1 2.7 1.1 1.6 3.0 2.0arrow_forwardFill on each conformation of (R)-2-chlorobutanearrow_forwardFor the 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 AB H/H H/Me H / Et H/i-Pr Energy kcal/mol 1.0 1.4 1.5 1.6 H/ t-Bu 3.0 Me / Me 2.6 Me / Et 2.7 Mei-Pr 3.0 GAUCHE A. Interactions Me / Me Me / Et Me / i-Pr Me / t-Bu Et / Et Et/i-Pr Et / t-Bu i-Pr/i-Pr 3-D sawhorse Energy kcal/mol Newman 0.9 0.95 1.1 2.7 1.1 1.6 Highest Energy Conformation 3.0 2.0arrow_forward
- Consider the molecule 1-bromo-2-methylbutane. C3 and C4 should be drawn as Et as in theexample. This group is called an ethyl group and can be considered a sphere about twice the sizeof a methyl group. Draw the following Newman projections sighting down the C1C2 bond... a. The lowest potential energy conformation. b. The highest potential energy staggered conformation.arrow_forwardQ2. a) Draw the Newman projection of the most stable staggered conformation of 2-methylpentane, looking down the 3,4 bond. H3C c-CH2-CH2CH3 H3C´H b) The structure of cis-1-tert-butyl-3-methylcyclohexane is shown below. Draw both chair forms of this molecule, and circle the one you think is less stable. Me 't-Buarrow_forward2. For the two compounds below, draw the two possible conformations. Circle the conformation(s) that would be the most stable. Remember, though A values were developed for cyclohexanes, they are a good guide for other types of rings as well! OH ço OEt ll pharrow_forward
- 4) Draw an alkene (minimum of 4 carbons) that is in the E conformation and a different alkene (also 4 carbon minimum) that is in the Z conformation. Provide an explanation as to what makes it E or Z.arrow_forwardDraw as many resonance structures as you can for the following carbonation. Label all of the carbonation structures as 1,2,3 (primary,secondary,tertiary) and circle the most stable conformation in terms of the carbonation.arrow_forwardComplete the following for the compound shown below. a) Draw the line structure using the wedge/dash bond convention to show the correct stereochemistry. b) Draw both chair conformations, and indicate that they are in equilibrium using appropriate arrows. c) Label the most stable structure. d) Label the most structure that is the major conformer in solution. e) Explain your answers to c) and d) as we did in class, and Loudon did in the text.arrow_forward
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