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 13a(3)

16장, 문제 13a(3)

Show how the following compounds can be prepared, using ethyne as one of the starting materials:
3. 2-methyl-3-hexyn-2-ol

검증된 단계별 안내

Step 1: Start with ethyne (C₂H₂) as the base molecule. Ethyne is a simple alkyne with a triple bond between two carbon atoms. The goal is to build the desired structure step by step by adding the necessary groups.

Step 2: Perform a hydroboration-oxidation reaction to convert ethyne into an aldehyde. Use reagents such as disiamylborane (R₂BH) followed by hydrogen peroxide (H₂O₂) and sodium hydroxide (NaOH). This will yield acetaldehyde (CH₃CHO).

Step 3: Perform an aldol addition reaction to extend the carbon chain. React acetaldehyde with a suitable aldehyde or ketone (e.g., butanal) in the presence of a base (e.g., NaOH) to form a β-hydroxy ketone intermediate. This step helps in building the hexyn backbone.

Step 4: Introduce the triple bond at the desired position. Use a strong base (e.g., NaNH₂) to deprotonate the β-hydroxy ketone intermediate, followed by elimination to form the alkyne. This will yield 2-methyl-3-hexyne.

Step 5: Perform a hydration reaction to introduce the hydroxyl group (-OH) at the desired position. Use reagents such as HgSO₄ and H₂SO₄ to hydrate the alkyne selectively, forming 2-methyl-3-hexyn-2-ol as the final product.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

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

Ethyne as a Building Block

Ethyne, also known as acetylene, is a simple alkyne that serves as a versatile building block in organic synthesis. Its triple bond allows for various reactions, including addition reactions with electrophiles, which can lead to the formation of more complex molecules. Understanding how to manipulate ethyne is crucial for synthesizing target compounds like 2-methyl-3-hexyn-2-ol.

Alkyne Reactions

Alkynes undergo a variety of reactions, including hydrohalogenation, hydration, and alkylation. These reactions can be used to introduce functional groups or extend carbon chains. For the synthesis of 2-methyl-3-hexyn-2-ol, knowledge of how to perform these reactions with ethyne is essential to achieve the desired structure and functionalization.

Functional Group Interconversion

Functional group interconversion involves transforming one functional group into another, which is often necessary in organic synthesis. In the case of 2-methyl-3-hexyn-2-ol, converting an alkyne to an alcohol through hydration is a key step. Understanding the mechanisms and conditions for these transformations is vital for successfully preparing the target compound.

Show how the following compounds can be prepared, using ethyne as one of the starting materials:3. 2-methyl-3-hexyn-2-ol