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

Problema 6a

Capitolo 10, Problema 6a

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

Guida verificata passo dopo passo

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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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.

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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.

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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.

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