Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Textbook Question
Chapter 4.SE, Problem 48AP
Approximately how much steric strain does the 1,3-diaxial interaction between the two methyl groups introduce into the diaxial conformation of cis-1, 3-dimethylcyclohexane? [See Problem 4-47.]
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what is the most stable conformation of (1R, 2S, 5R)-1,2,5-trimethylcyclohexane
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3-35
Each of the following descriptions applies to more than one alkane. In each case, draw and name two structures that match
the description.
(a) an isopropylheptane
(d) a trans-dihalocyclopentane
(b) a diethyldecane
(e) a (2,3-dimethylpentyl)cycloalkane
(c) a cis-diethylcyclohexane
(f) a bicyclononane
Chapter 4 Solutions
Organic Chemistry
Ch. 4.1 - Give IUPAC names for the following cycloalkanes:Ch. 4.1 - Draw structures corresponding to the following...Ch. 4.1 - Name the following cycloalkane:Ch. 4.2 - Prob. 4PCh. 4.2 - Draw the structures of the following molecules:...Ch. 4.2 - Prostaglandin F2α, a hormone that causes uterine...Ch. 4.2 - Name the following substances, including the cis-...Ch. 4.3 - Each H↔H eclipsing interaction in ethane costs...Ch. 4.3 - cis-1, 2-Dimethylcyclopropane has more strain than...Ch. 4.4 - Prob. 10P
Ch. 4.4 - Two conformations of cis-l, 3-dimethylcyclobutane...Ch. 4.6 - Draw two different chair conformations of...Ch. 4.6 - Draw two differant chair conformations of trans-1,...Ch. 4.6 - Prob. 14PCh. 4.7 - What is the energy difference between the axial...Ch. 4.7 - Prob. 16PCh. 4.7 - Look at Figure 4-12 on page 105, and estimate the...Ch. 4.8 - Draw the more stable chair conformation of the...Ch. 4.8 - Identify each substituent in the following...Ch. 4.9 - Which isomer is more stable, cis-decalin or...Ch. 4.9 - Look at the following structure of the female...Ch. 4.SE - Prob. 22VCCh. 4.SE - Name the following compound, identify each...Ch. 4.SE - A trisubstituted cyclohexane with three...Ch. 4.SE - The following cyclohexane derivative has three...Ch. 4.SE - Prob. 26VCCh. 4.SE - Draw the five cycloalkanes with the formula C5H10.Ch. 4.SE - Draw two constitutional isomers of cis-1,...Ch. 4.SE - Prob. 29APCh. 4.SE - Tell whether the following pairs of compounds are...Ch. 4.SE - Prob. 31APCh. 4.SE - Prob. 32APCh. 4.SE - Draw 1, 3, 5-trimethylcyclohexane using a hexagon...Ch. 4.SE - Hydrocortisone, a naturally occurring hormone...Ch. 4.SE - A 1, 2-cis disubstituted cyclohexane, such as...Ch. 4.SE - A 1, 2-trans disubstituted cyclohexane must have...Ch. 4.SE - Prob. 37APCh. 4.SE - Which is more stable, a 1, 4-trans disubstituted...Ch. 4.SE - cis-1, 2-Dimethylcyclobutane is less stable than...Ch. 4.SE - From the data in Figure 4-12 and Table 4-1,...Ch. 4.SE - Prob. 41APCh. 4.SE - Draw the two chair conformations of...Ch. 4.SE - Draw the two chair conformations of...Ch. 4.SE - Galactose, a sugar related to glucose, contains a...Ch. 4.SE - There are four cis-trans isomers of menthol...Ch. 4.SE - There are four cis-trans isomers of menthol...Ch. 4.SE - The diaxial conformation of cis-1,...Ch. 4.SE - Approximately how much steric strain does the...Ch. 4.SE - In light of your answer to Problem 4-43, draw the...Ch. 4.SE - Prob. 50APCh. 4.SE - Prob. 51APCh. 4.SE - Using molecular models as well as structural...Ch. 4.SE - trans-Decalin is more stable than its cis isomer,...Ch. 4.SE - As mentioned in Problem 3-53, the statin drugs,...Ch. 4.SE - myo-Inositol, one of the isomers of...Ch. 4.SE - How many cis–trans stereoisomers of myo-inositol...Ch. 4.SE - The German chemist J. Bredt proposed in 1935 that...Ch. 4.SE - Tell whether each of the following substituents on...Ch. 4.SE - Prob. 59APCh. 4.SE - Prob. 60APCh. 4.SE - Ketones react with alcohols to yield products...Ch. 4.SE - Alcohols undergo an oxidation reaction to yield...
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- Increased substitution around a bond leads to increased strain. Take the four substituted butanes listed below, for example. For each compound, sight along the C2-C3 bond and draw Newman projections of the most stable and least stable conformations. Use the data in Table 3-5 to assign strain-energy values to each conformation. Which of the eight conformations is most strained? Which is least strained? (a) 2-Methylbutane (b) 2,2-Dimethylbutane (c) 2,3-Dimethylbutane (d) 2,2,3-Trimethylbutanearrow_forwardFrom the data in Figure 4-12 and Table 4-1, estimate the percentages of molecules that have their substituents in an axial orientation for the following compounds: (a) Isopropylcyclohexane (b) Fluorocyclohexane (c) Cyclohexanecarbonitrile, C6H11CNarrow_forwardIf you examine the structural formulas for the following cycloalkenes, you will see that the configuration of the double bond is cis in each. Cyclopentene Cyclohexene Cycloheptene All attempts to synthesize these cycloalkenes in which the double bond has a trans configuration have failed. Apparently, it is impossible to have a trans configuration in these cycloalkenes. Offer an explanation for why this is so.arrow_forward
- 4.(a). Draw the structures of (i) cis-1,4-Dibromocyclohexane and (ii) trans-1,4- Dibromocyclohexane. 4(b). Draw the most stable conformers of (i) cis-1,4-Dibromocyclohexane and (ii) trans-1,4-Dibromocyclohexane. 4(c)Which is more stable? (i) cis-1,4-Dibromocyclohexane or (ii) trans-1,4- Dibromolcyclohexane. Explain the reason for your choice.arrow_forwardConsider the isomers of tert-butylcyclohexanol in conformational structures. Two are cis-2-tert-butylcyclohexanol and two are cis-3-tert-butylcyclohexanol. Indicate which is the more stable conformation for each pair, and indicate which of all four conformations is the most stable. FIX a box OH HO OH A Select the more stable conformation of cis-2-tert-butylcyclohexanol. B OD C B C D ☐A C OH Select the more stable conformation of cis-3-tert-butylcyclohexanol.arrow_forwardCyclohexane derivatives exist primarily in the most stable of the available chair conformations. Give the position, axial or equatorial, of each of the three groups shown when the ring is in the most stable chair conformation. If a group divides its time equally between axial and equatorial positions, indicate this with ax/eq.arrow_forward
- 11. s) Draw the most stable conformation of 1,3-dichloro-2,4-difluorocyclohexane: 12. Which of the following represents the most stable conformation of 1,2,4,5- tetramethyleyclohexane? (one correct answer) CH b) CH HC H- H- CH HC CH, CH 6. Give IUPAC name for the following molecule. Include "cis" and "trans" designations if applicable. H2C-CH3 H -CH2 H- H Brarrow_forwardFor trans‑1‑ethyl‑4‑isopropylcyclohexane, which structures represent the possible boat conformations?arrow_forwardWhat is the most stable conformation for trans-1,2-dichlorocyclohexane. Describe and explain brieflyarrow_forward
- Among the figure, (a) what is the most stable conformation of n-pentane? (b) gauche conformation of butane and (c) least stable conformation of butanearrow_forwardWrite a conformational structure for 1,2,3-trimethylcyclohexane in which all the methyl groups are axial and then show its more stable conformation.arrow_forwardRank the conformations of n-butane with reference to its potential energy from the most stable to the least stable. Rank from the most stable to the least stable. To rank items as equivalent, overlap them.arrow_forward
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