Organic Chemistry (9th Edition)
9th Edition
ISBN: 9780321971371
Author: Leroy G. Wade, Jan W. Simek
Publisher: PEARSON
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Textbook Question
Chapter 3.15, Problem 3.27P
- a. Draw both chair conformations of cis-1 4-dimethylcyclohexane and determine which conformer is more stable.
- b. Repeat for the trans isomer.
- c. Predict which isomer (cis or trans) is more stable.
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Consider 1,2-dimethylcyclohexane.a. Draw structures for the cis and trans isomers using a hexagon for the six-membered ring.b. Draw the two possible chair conformations for the cis isomer. Which conformation, if either, is more stable?c. Draw the two possible chair conformations for the trans isomer. Which conformation, if either, is more stable?d. Which isomer, cis or trans, is more stable and why?
a) Draw the two ring flipped conformers of each molecule A and B. Indicate the more
stable conformer, respectively.
CH3
fCH3
H,C.
CH3
H3C.
CH3
CI
CI
A
B
a) Which is more stable between A and B? Why?
Consider 1,2-dimethylcyclohexane.
a.Draw structures for the cis and trans isomers using a hexagon for the sixmembered ring.
b. Draw the two possible chair conformations for the cis isomer. Which conformation, if either, is more stable?
c. Draw the two possible chair conformations for the trans isomer. Which conformation, if either, is more stable?
d.Which isomer, cis or trans, is more stable and why?
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- Following is a chair conformation of cyclohexane with the carbon atoms numbered 1 through 6. (a) Draw hydrogen atoms that are above the plane of the ring on carbons 1 and 2 and below the plane of the ring on carbon 4. (b) Which of these hydrogens are equatorial? Which are axial? (c) Draw the alternative chair conformation. Which hydrogens are equatorial? Which are axial? Which are above the plane of the ring? Which are below it?arrow_forwardConsider 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_forwardIn the next chapter we'll look at cycloalkanes—saturated cyclic hydrocarbons—and we’ll see that the molecules generally adopt puckered, nonplanar conformations. Cyclohexane, for instance, has a puckered shape like a lounge chair rather than a flat shape. Why?arrow_forward
- rotation here a. Draw the three staggered and three eclipsed conformations that result from rotation around the designated bond using Newman projections. b. Label the most stable and least stable conformation. CH3-C-CH,CH3arrow_forwardAnswer the following questions and upload your answer. A. Draw the two chair conformations of cis-1-isopropyl-3-methylcyclohexane. Write under your drawing which conformation is the most stable one. B. Would the trans isomer be more stable than the cis isomer? Why?arrow_forward3. Draw the chair conformer of cyclohexane. Label the axial hydrogens (Ha) and the equatorial hydrogens (He).arrow_forward
- 1: Draw the chain conformer of... 1a. Cyclohexane, label all the axial and equatorial hydrogens 1b. The most stable conformer of ethylcyclohexane 1c. The most sable conformer of trans-1-tert-butyl-3-methylcyclohexanearrow_forwardConsider pentane, C5H12. Looking through the internal C3-C4single bond, draw thesix Newman projections (where the angle between two bonds as you look through the C3and C4bond is either 0°or 60°of the different conformations. Label the conformers/rotamers using I, II, etc. a.Which conformer is the most stable? the least stable? b.Which rotamer is the anticonformer? the gaucheconformer? c.Draw the anticonformer in saw horse projection.arrow_forwardFor each compound drawn below: a. Draw representations for the cis and trans isomers using a hexagon for the six-membered ring, and wedges and dashed wedges for substituents. b.Draw the two possible chair conformations for the cis isomer. Which conformation, if either, is more stable? c. Draw the two possible chair conformations for the trans isomer. Which conformation, if either, is more stable? d.Which isomer, cis or trans, is more stable and why?arrow_forward
- 3. Draw both chair conformations for the cyclohexane molecule shown below, and circle the most stable conformation (the methyl group is larger than the hydroxyl group). OH H3Carrow_forwarda. For each disubstituted cyclohexane below, draw its ring-flip isomer. Circle the most stable conformation and label the substituent groups as axial or equatorial. ( see image) b.Draw and name the seven constitutional isomers (all contain a ring of some size) for cycloalkane, C6H12.arrow_forwardSight along the C2-Cl bond of 2-methylpropane (isobutane). a. Draw a Newman projection of the most stable conformation. b. Draw a Newman projection of the least stable conformation. c. Make a graph of energy versus angle of rotation around the C2-Cl bond. d. Assign relative values to the maxima and minima in your graph, given that an H↔H eclipsing interaction costs 0 kJ/mol and an H↔CH3 eclipsing interaction costs 6.0 kJ/mol.arrow_forward
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