Ch. 14 - Ethers, Epoxides, and Thioethers

Wade9th EditionOrganic ChemistryISBN: 9780135213728Not the one you use?Change textbook

Wade 9th Edition

Ch. 14 - Ethers, Epoxides, and Thioethers

Problem 15c

Chapter 14, Problem 15c

Predict the products of the following reactions. An excess of acid is available in each case.
(c) anisole (methoxybenzene) + HBr

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Identify the type of reaction taking place. In this case, since an excess of acid is available, consider the possibility of an acid-catalyzed reaction such as hydration, esterification, or hydrolysis.

Examine the structure of the reactants. Look for functional groups that are reactive in the presence of acid, such as alkenes, alcohols, or esters.

Determine the mechanism of the reaction. For example, if the reactant is an alkene, the reaction might proceed through an electrophilic addition mechanism where the acid protonates the alkene to form a carbocation intermediate.

Predict the formation of intermediates. In the case of a carbocation intermediate, consider possible rearrangements that could lead to a more stable carbocation.

Identify the final products by considering the stability of the intermediates and the possible nucleophiles present in the reaction mixture. For example, water could act as a nucleophile in an acid-catalyzed hydration reaction, leading to the formation of an alcohol.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Acid-Base Reactions

Acid-base reactions involve the transfer of protons (H+) between reactants. In organic chemistry, acids can donate protons, while bases accept them. Understanding the role of acids in promoting reactions, especially in the presence of excess acid, is crucial for predicting the products formed in various organic transformations.

Nucleophilic Substitution

Nucleophilic substitution is a fundamental reaction mechanism where a nucleophile attacks an electrophile, replacing a leaving group. This concept is essential for predicting products in reactions involving alkyl halides or other electrophilic centers, especially when acid catalysis can enhance the nucleophilicity of the attacking species.

Rearrangement Reactions

Rearrangement reactions involve the structural reorganization of a molecule, often facilitated by acidic conditions. These reactions can lead to the formation of more stable products or different isomers. Recognizing when and how rearrangements occur is vital for accurately predicting the outcomes of organic reactions under acidic conditions.

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Related Practice

Textbook Question

Which of the following ethers can be formed in good yield by condensation of the corresponding alcohols? For those that cannot be formed by condensation, suggest an alternative method that will work.

(a) dibutyl ether

(b) ethyl n-propyl ether

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Textbook Question

Predict the products of the following reactions. An excess of acid is available in each case.

(d)

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Textbook Question

Boron tribromide (BBr3) cleaves ethers to give alkyl halides and alcohols.

The reaction is thought to involve attack by a bromide ion on the Lewis acid–base adduct of the ether with BBr₃ (a strong Lewis acid). Propose a mechanism for the reaction of butyl methyl ether with BBr₃ to give (after hydrolysis) butan-1-ol and bromomethane.

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Textbook Question

Propose a mechanism for the following reaction.

Show how you would synthesize butyl isopropyl sulfide using butan-1-ol, propan-2-ol, and any solvents and reagents you need.

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Textbook Question