Organic Chemistry (6th Edition)
6th Edition
ISBN: 9781260119107
Author: Janice Gorzynski Smith
Publisher: McGraw Hill Education
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Textbook Question
Chapter 4.10, Problem 19P
Consider rotation around the carbon-carbon bond in
a. Using Newman projections, draw all of the staggered and eclipsed conformations that result from rotation around this bond.
b. Graph energy versus dihedral angle for rotation around this bond
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Consider rotation around the carbon–carbon bond in 1,2-dichloroethane (ClCH2CH2Cl).
a.Using Newman projections, draw all of the staggered and eclipsed conformations that result from rotation around this bond.
b.Graph energy versus dihedral angle for rotation around this bond.
Model 2. Cyclohexane Chair Conformation
Another helpful way to drawn a non-planar example of cyclohexane is to draw its most stable (lowest energy) conformation
called a chair conformation.
III
8.
Build two models of cyclohexane.
The chair conformation is the most stable conformation of cyclohexane because all of the bond angles around
the carbon atoms are at 109.5ª and all carbon atoms are in the more stable staggered conformation.
Cyclohexane is the only cyclic structure that allows all the bond angles around each carbon to be 109.5", thus is
the only ring that adopts a true chair conformation. Form the chair conformation with both of your
cyclohexane models. Look down each carbon carbon bond and verify that all carbons are in a staggered
conformation.
9.
10. Because of this conformation, there are two types of positions a group can occupy when it is attached to a
cyclohexane chair, either axial (A) or equatorial (E).
11. Axial hydrogens alternate straight up and straight down as we…
Sight 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.
Chapter 4 Solutions
Organic Chemistry (6th Edition)
Ch. 4.1 - Prob. 1PCh. 4.1 - Problem 4.2 Which of the following is not another...Ch. 4.1 - Problem 4.3 Draw the five constitutional isomers...Ch. 4.1 - Prob. 4PCh. 4.1 - Prob. 5PCh. 4.2 - Draw the five constitutional isomers that have...Ch. 4.4 - Problem 4.7 Give the IUPAC name for each...Ch. 4.4 - Give the IUPAC name for each compound. a....Ch. 4.4 - Problem 4.9 Give the structure corresponding to...Ch. 4.4 - Prob. 10P
Ch. 4.5 - Give the IUPAC name for each compound.Ch. 4.5 - Give the structure corresponding to each IUPAC...Ch. 4.8 - Arrange the following compounds in order of...Ch. 4.9 - Problem 4.14 Draw the staggered and eclipsed...Ch. 4.9 - Prob. 15PCh. 4.9 - Prob. 16PCh. 4.10 - Problem 4.17 a. Draw the three staggered and...Ch. 4.10 - Problem 4.18 Rank the following conformations in...Ch. 4.10 - Problem 4.19 Consider rotation around the...Ch. 4.10 - Calculate the destabilization present in each...Ch. 4.12 - Problem 4.21 Classify the ring carbons as up or...Ch. 4.12 - Problem 4.22 Using the cyclohexane with the C’s...Ch. 4.13 - Draw a second chair conformation for each...Ch. 4.13 - Problem 4.24 Draw both conformations for and...Ch. 4.13 - Problem 4.25 Draw the structure for each compound...Ch. 4.13 - Prob. 26PCh. 4.14 - Prob. 31PCh. 4.14 - Prob. 32PCh. 4.15 - Prob. 33PCh. 4 - Name each alkane using the ball-and-stick model,...Ch. 4 -
4.40 Draw the structure corresponding to each...Ch. 4 - 4.42 Give the IUPAC name for each compound.
a....Ch. 4 - Prob. 42PCh. 4 - 4.46 Considering rotation around the bond...Ch. 4 - 4.50 Calculate the barrier to rotation for each...Ch. 4 - 4.51 The eclipsed conformation of is less...Ch. 4 - (a) Draw the anti and gauche conformations for...Ch. 4 - For each compound drawn below: a.Label each OH,Br...Ch. 4 - Draw the two possible chair conformations for...Ch. 4 - For each compound drawn below: a. Draw...Ch. 4 - Classify each pair of compounds as constitutional...Ch. 4 - Prob. 66PCh. 4 - 4.64 Draw the products of combustion of each...Ch. 4 - 4.65 Hydrocarbons like benzene are metabolized in...Ch. 4 - Prob. 69PCh. 4 - Prob. 70PCh. 4 - Cyclopropane and cyclobutane have similar strain...Ch. 4 - Prob. 72PCh. 4 - Haloethanes (CH3CH2X,X=Cl,Br,I) have similar...Ch. 4 - Prob. 74PCh. 4 - Prob. 75PCh. 4 - Consider the tricyclic structure B (a) Label each...Ch. 4 - Read Appendix B on naming branched alkyl...Ch. 4 - Read Appendix B on naming bicyclic compounds. Then...
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- 1. Considering compounds that have the same number of carbon atoms, explain why alkanes and cycloalkanes have different molecular formulas but alkenes and cycloalkanes have the same molecular formulas. 2. Draw the condensed or line-angle structure for an alkene with the formula C5H10. 3. Draw the condensed or line-angle structure for 4 more C5H10 isomers (2 additional alkenes and 2 cyclic isomers).arrow_forwardConsider 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?arrow_forward9) There are 3 different cyclopropane molecules with the formula GHĄC12. a. Draw and build the 3 molecules. b. Below each drawing, name each molecule with correct nomenclature. Label a pair that are constitutional isomers. d. Label a pair that are stereoisomers (or configurational isomers). С.arrow_forward
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