Organic Chemistry
9th Edition
ISBN: 9781305080485
Author: John E. McMurry
Publisher: Cengage Learning
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Chapter 11.9, Problem 19P
Interpretation Introduction
Interpretation:
In which isomer the E2 elimination occurs faster is interpreted. The more stable chair confirmation is drawn to explain the reaction.
Concept introduction:
If the leaving group and hydrogen are trans diaxial only the E2 elimination occurs in cyclohexane rings. The E2 elimination occurs by Zaitsevs rule.
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Trans-1-bromo-2-methylcyclohexane will yield a non-Zaitsev elimination product (3-methylcyclohexene) upon reaction with KOH. Show this reaction by drawing the chair conformations of the reactant and product. Include the curved arrows and explain why the product is not a non-Zaitsev product.
Chapter 11 Solutions
Organic Chemistry
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Ch. 11.5 - Rank the following substances in order of their...Ch. 11.5 - 3-Bromo-1-butene and 1-bromo-2-butene undergo SN1...Ch. 11.5 - Prob. 13PCh. 11.6 - Review the mechanism of geraniol biosynthesis...Ch. 11.7 - Prob. 15PCh. 11.7 - What alkyl halides might the following alkenes...Ch. 11.8 - Prob. 17PCh. 11.8 - Prob. 18PCh. 11.9 - Prob. 19PCh. 11.12 - Prob. 20PCh. 11.SE - Prob. 21VCCh. 11.SE - From what alkyl bromide was the following alkyl...Ch. 11.SE - Prob. 23VCCh. 11.SE - Prob. 24VCCh. 11.SE - Prob. 25MPCh. 11.SE - Prob. 26MPCh. 11.SE - Prob. 27MPCh. 11.SE - Prob. 28MPCh. 11.SE - Prob. 29MPCh. 11.SE - Prob. 30MPCh. 11.SE - Prob. 31MPCh. 11.SE - Prob. 32MPCh. 11.SE - Metabolism of S-adenosylhomocysteine (Section...Ch. 11.SE - Reaction of iodoethane with CN- yields a small...Ch. 11.SE - One step in the urea cycle for ridding the body of...Ch. 11.SE - Prob. 36MPCh. 11.SE - Prob. 37MPCh. 11.SE - Propose a mechanism for the following reaction, an...Ch. 11.SE - Prob. 39APCh. 11.SE - The following Walden cycle has been carried out....Ch. 11.SE - Prob. 41APCh. 11.SE - Which reactant in each of the following pairs is...Ch. 11.SE - Prob. 43APCh. 11.SE - Prob. 44APCh. 11.SE - Prob. 45APCh. 11.SE - Prob. 46APCh. 11.SE - Prob. 47APCh. 11.SE - Prob. 48APCh. 11.SE - Propose structures for compounds that fit the...Ch. 11.SE - What products would you expect from the reaction...Ch. 11.SE - Prob. 51APCh. 11.SE - Prob. 52APCh. 11.SE - Prob. 53APCh. 11.SE - Prob. 54APCh. 11.SE - Prob. 55APCh. 11.SE - Order each of the following sets of compounds with...Ch. 11.SE - Order each of the following sets of compounds with...Ch. 11.SE - Prob. 58APCh. 11.SE - Prob. 59APCh. 11.SE - Ethers can often be prepared by SN2 reaction of...Ch. 11.SE - Show the stereochemistry of the epoxide (see...Ch. 11.SE - Prob. 62APCh. 11.SE - In addition to not undergoing substitution...Ch. 11.SE - The tosylate of (2R, 3S)-3-phenyl-2-butanol...Ch. 11.SE - Prob. 65APCh. 11.SE - Prob. 66APCh. 11.SE - Prob. 67APCh. 11.SE - Prob. 68APCh. 11.SE - Prob. 69APCh. 11.SE - (S)-2-Butanol slowly racemizes on standing in...Ch. 11.SE - Reaction of HBr with (R)-3-methyl-3-hexanol leads...Ch. 11.SE - Treatment of 1-bromo-2-deuterio-2-phenylethane...Ch. 11.SE - Prob. 73APCh. 11.SE - Prob. 74APCh. 11.SE - In light of your answer to Problem 11-74, explain...Ch. 11.SE - Prob. 76APCh. 11.SE - Compound X is optically inactive and has the...Ch. 11.SE - When a primary alcohol is treated with...Ch. 11.SE - Prob. 79APCh. 11.SE - Amines are converted into alkenes by a two-step...Ch. 11.SE - The antipsychotic drug flupentixol is prepared by...
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- Predict the stereochemistry for the following E2 reaction. Draw a Newmann Projection of the reactive conformation and the structure for only major product of the reactionarrow_forwardFrom trans-1-chloro-2-isopropylcyclohexane, only 3-isopropylcyclohexene, the less substituted alkene, is formed. Using conformational analysis, explain why this product is observed. Also, will the E2 reaction with trans-1-chloro- 2-isopropylcyclohexane or cis-1-chloro-2-isopropylcyclohexane occur faster under the same basic conditions? CH;O Na* CH3OH CI trans-1-Chloro-2 (R)-3-Isopropylcyclohexene isopropylcyclohexanearrow_forward11. Trans-1-bromo-2-methylcyclohexane will yield a non-Zaitsev elimination product (3- methylcyclohexene) upon reaction with KOH. Show this reaction by drawing the chair conformations of the reactant and product. Include the curved arrows and explain why the product is not a non-Zaitsev product. (arrow_forward
- Draw the Newman projection (sighting down this bond) of the conformation that will be capable of an E2 elimination. R/S stereochemistry is graaded. CH3 H. H. CH3 Please selec Br Harrow_forwardKetones react with alcohols to yield products called acetals. Why does the all-cis isomer of 4-tert-butyl-1,3-cyclohexanediol react readily with acetone and an acid catalyst to form an acetal, but other stereoisomers do not react? In formulating your answer, draw the more stable chair conformations of all four stereoisomers and the product acetal for each one.arrow_forwardDraw a reaction mechanism illustrating the transition state structure and stereochemistry of the resulting product (if any).a. (R)-2-bromobutane + -OCH3 → (SN2)b. (S)-3-bromo-3-methylhexane + methanol → (SN1)c. 2-Chloro-2-methylhekxane + -OH → (E1)arrow_forward
- Draw the starting alkene that would lead to this the major product (and its enantiomer) under these conditions. Drawing H2 Pd/C OD0 000 F5 F4arrow_forwardRedraw the structure of the starting material in the required conformation (using a Newman projection and the final product you would expect from an E2 elimination reaction of the compound shown with NaOH. Indicate the expected Z or E stereochemistry of the final product (circle your choice).arrow_forwardAcyclic conjugated dienes may exist in two conformations, as shown below. Based on differences in steric strain, which of the following dienes has the greatest preference for the s-trans conformation? * s-cis s-trans H;C / H;C- CH3 CH3 CH3 H;C- CH3arrow_forward
- Q11. Draw all the possible chair-like conformations of compounds 1-2. In the presence of a strong base, compound 1 undergoes an elimination following an E2 mechanism to generate the most substituted and thermodynamically most favoured alkene 3, while compound 2 generates the less stable alkene 4. Knowing that the E2 mechanism requires the two leaving groups to be antiperiplanar, use the chair-like structures of compounds 1 and 2 to justify this difference in reactivity. CH3 CH3 Br E2 more stable alkene 1 3 CH3 CH3 Br E2 less stable alkene 4arrow_forward2. Our knowledge of chair conformations allows us to use them to determine a great deal about a reaction's mechanism. In particular, using a t-butyl group to 'fix' a cyclohexane in a single conformation can help us learn about the spatial requirements and energetics of a reaction. Consider the following two reaction products: a. NO NID ALOH 1) NaCN 2) H+ 1) NaBH4 2) H3O+ OH Group -H -CN -OH A Value (kcal/mol) Defined as 0 0.2 kcal/mol 1.0 kcal/mol Draw the most stable chair conformation for each of the two products. b. Based on the A values in the table above, do the two products have the most stable conformation at the new stereocenter?arrow_forwardWhich Newman projection corresponds to the conformation of this compound that can undergo E2 elimination? Et CI E2 ? H tBu tBu tBu H H Me Et. H Me H CI tBu CI H CI H CI H Me Et Me Et A B Darrow_forward
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