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

Bruice8th EditionOrganic ChemistryISBN: 9780135213711Non è quello che usi tu?Cambia libro di testo

Bruice 8th Edition

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

Problema 63a,b

Capitolo 10, Problema 63a,b

What is the major product(s) of each of the following reactions?
a.
b.

Guida verificata passo dopo passo

Step 1: Analyze the first reaction. The reactant is a ketone (CH3COCH2CH3) with a tertiary alkyl group attached to the carbonyl carbon. The reagent is HBr under heat (Δ). This suggests a halogenation reaction at the alpha-carbon of the ketone via an enol or enolate intermediate.

Step 2: In the first reaction, the acidic HBr protonates the carbonyl oxygen, increasing the electrophilicity of the carbonyl carbon. This facilitates the formation of an enol intermediate by tautomerization.

Step 3: The enol intermediate reacts with HBr, where the bromine atom adds to the alpha-carbon of the ketone. The major product will be the alpha-bromo ketone.

Step 4: Analyze the second reaction. The reactant is an ether (CH3CHCH2OCH3) with a secondary alkyl group attached to the oxygen. The reagent is HI under heat (Δ). This suggests a cleavage of the ether bond via an SN1 or SN2 mechanism.

Step 5: In the second reaction, HI protonates the ether oxygen, making it a better leaving group. The bond between the oxygen and the methyl group breaks, forming CH3I and a secondary alcohol (CH3CHCH2OH). The major products are methyl iodide and the alcohol.

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