Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

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Bruice 8th Edition

Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

문제 6a

10장, 문제 6a

What is the major product of each of the following reactions?
a.

검증된 단계별 안내

Step 1: Identify the type of reaction. The reaction involves an alcohol (OH group) reacting with HCl, which is a strong acid. This is a substitution reaction where the hydroxyl group (-OH) is replaced by a halide (Cl).

Step 2: Determine the mechanism. Since the alcohol is tertiary (the carbon attached to the -OH group is bonded to three other carbons), the reaction will proceed via an SN1 mechanism. This is because tertiary carbons stabilize the carbocation intermediate formed during the reaction.

Step 3: Protonation of the alcohol. The hydroxyl group (-OH) is protonated by HCl, forming water (H2O), which is a good leaving group. This step increases the likelihood of the leaving group departing.

Step 4: Formation of the carbocation. After the water molecule leaves, a tertiary carbocation is formed. This carbocation is highly stable due to hyperconjugation and inductive effects from the surrounding alkyl groups.

Step 5: Nucleophilic attack. The chloride ion (Cl⁻) from HCl acts as a nucleophile and attacks the carbocation, forming the final product, which is a tertiary alkyl chloride.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Nucleophilic Substitution

Nucleophilic substitution is a fundamental reaction in organic chemistry where a nucleophile replaces a leaving group in a molecule. In this case, the hydroxyl group (OH) acts as a nucleophile, and when reacting with HCl, it can be substituted by a chloride ion (Cl-), leading to the formation of an alkyl chloride.

Reactivity of Alcohols

Alcohols are organic compounds containing hydroxyl (-OH) groups, and their reactivity can vary based on the structure of the alcohol. In this reaction, the presence of HCl facilitates the conversion of the alcohol into a more reactive alkyl halide, which is often more favorable for further reactions, such as elimination or substitution.

Mechanism of Reaction

Understanding the mechanism of the reaction is crucial for predicting the major product. The reaction typically proceeds via a two-step mechanism: protonation of the alcohol by HCl to form a better leaving group, followed by the nucleophilic attack by chloride ion, resulting in the formation of the alkyl chloride as the major product.

What is the major product of each of the following reactions? a.