Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives

Bruice8th EditionOrganic ChemistryISBN: 9780135213711당신이 사용하는 게 아니라요?교과서 변경

Bruice 8th Edition

Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives

문제 72d

16장, 문제 72d

How could you convert N-methylbenzamide to the following compounds?
d. benzyl alcohol

검증된 단계별 안내

Step 1: Begin by hydrolyzing N-methylbenzamide to benzoic acid. This can be achieved using acidic or basic hydrolysis conditions. For example, heating the compound with aqueous HCl or NaOH will break the amide bond, yielding benzoic acid and methylamine.

Step 2: Reduce the benzoic acid to benzyl alcohol. This can be done using a reducing agent such as lithium aluminum hydride (LiAlH4), which is highly effective for reducing carboxylic acids to primary alcohols.

Step 3: After the reduction, isolate and purify the benzyl alcohol product using techniques such as distillation or recrystallization, depending on the physical properties of the product.

Step 4: Confirm the structure of benzyl alcohol using spectroscopic methods such as NMR or IR. For example, the IR spectrum should show a broad O-H stretch around 3200-3600 cm⁻¹, and the NMR spectrum should display signals corresponding to the benzyl group and hydroxyl proton.

Step 5: Ensure that the reaction conditions are optimized to prevent over-reduction or side reactions, such as the formation of toluene from benzyl alcohol.

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주요 개념

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

Amide Hydrolysis

Amide hydrolysis is a chemical reaction where an amide reacts with water to form a carboxylic acid and an amine or ammonia. In the case of N-methylbenzamide, hydrolysis can lead to the formation of benzoic acid and methylamine. This reaction is typically catalyzed by either acidic or basic conditions, which facilitate the breaking of the carbon-nitrogen bond.

Reduction Reactions

Reduction reactions involve the gain of electrons or the decrease in oxidation state of a molecule. In organic chemistry, reducing agents such as lithium aluminum hydride (LiAlH4) or sodium borohydride (NaBH4) can convert carbonyl compounds into alcohols. In this context, the reduction of benzoic acid (formed from the hydrolysis of N-methylbenzamide) to benzyl alcohol is a key step in the transformation.

Functional Group Interconversion

Functional group interconversion refers to the transformation of one functional group into another within a molecule. In this case, converting the carboxylic acid (benzoic acid) into an alcohol (benzyl alcohol) is an example of functional group interconversion. This process is essential in organic synthesis, allowing chemists to modify compounds to achieve desired properties or reactivity.

How could you convert N-methylbenzamide to the following compounds?d. benzyl alcohol