Suggest an acetylide ion and a carbonyl that might be used to make the following products.
(c) 5-phenylhex-2-yn-1-ol

검증된 단계별 안내

Step 1: Recognize that the product, 5-phenylhex-2-yn-1-ol, contains a terminal alcohol (-OH group) and a triple bond (-C≡C-) in the structure. This suggests that the reaction involves the addition of an acetylide ion to a carbonyl compound.

Step 2: Identify the acetylide ion needed. The acetylide ion must contribute the triple bond and part of the carbon chain. In this case, the acetylide ion should be phenylethynide (C₆H₅-C≡C⁻), as it provides the phenyl group and the triple bond.

Step 3: Determine the carbonyl compound. The carbonyl compound must provide the remaining carbon chain and the terminal alcohol group after the reaction. For this product, the carbonyl compound should be propanal (CH₃-CH₂-CHO), as it contributes the three-carbon chain ending in an aldehyde group.

Step 4: Understand the reaction mechanism. The acetylide ion (C₆H₅-C≡C⁻) acts as a nucleophile and attacks the electrophilic carbon of the aldehyde group in propanal (CH₃-CH₂-CHO). This forms a new carbon-carbon bond.

Step 5: After the nucleophilic addition, the intermediate is protonated to yield the final product, 5-phenylhex-2-yn-1-ol. This protonation step typically occurs in the presence of water or a mild acid.

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영상 길이:

주요 개념

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

Acetylide Ion

An acetylide ion is a negatively charged species formed by deprotonating a terminal alkyne. It is a strong nucleophile, capable of attacking electrophilic carbon centers, such as those found in carbonyl compounds. In organic synthesis, acetylide ions are often used to form carbon-carbon bonds, making them essential for constructing complex molecules.

Carbonyl Compounds

Carbonyl compounds contain a carbon atom double-bonded to an oxygen atom (C=O). They include aldehydes and ketones, which are key intermediates in organic synthesis. The electrophilic nature of the carbonyl carbon allows it to react with nucleophiles, such as acetylide ions, facilitating the formation of alcohols and other functional groups in multi-step synthesis.

Alkyne to Alcohol Conversion

The conversion of alkynes to alcohols typically involves nucleophilic addition reactions. In this context, an acetylide ion can react with a carbonyl compound to form an intermediate, which can then be protonated to yield an alcohol. This transformation is crucial for synthesizing alcohols with specific structures, such as the target product 5-phenylhex-2-yn-1-ol.

Suggest an acetylide ion and a carbonyl that might be used to make the following products. (c) 5-phenylhex-2-yn-1-ol