Show how cyclohexanone might be converted to the following δ-diketone (Hint: Stork).

검증된 단계별 안내

Identify the target molecule (δ-diketone) and recognize that the transformation involves the introduction of a second ketone group at the δ-position relative to the existing ketone in cyclohexanone. This suggests the use of a method that allows for selective functionalization at the δ-position.

Recall the Stork enamine reaction, which is a useful method for functionalizing ketones. Cyclohexanone can react with a secondary amine (e.g., pyrrolidine) to form an enamine intermediate. This enamine is nucleophilic and can undergo alkylation or acylation reactions.

React cyclohexanone with a secondary amine (e.g., pyrrolidine) and a catalytic amount of acid to form the enamine intermediate. The enamine will have a nucleophilic carbon at the α-position of the original ketone.

Perform an acylation reaction on the enamine using an acyl chloride (e.g., an appropriate acid chloride) to introduce the second ketone group at the δ-position. The enamine acts as a nucleophile, attacking the electrophilic carbonyl carbon of the acyl chloride.

Hydrolyze the resulting intermediate under acidic conditions to regenerate the ketone functionality and obtain the δ-diketone product. This step involves breaking the enamine back into the original ketone structure with the newly introduced ketone group at the δ-position.

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이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

주요 개념

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

Cyclohexanone

Cyclohexanone is a cyclic ketone with the formula C6H10O, characterized by a six-membered carbon ring with a carbonyl group (C=O). It serves as a versatile intermediate in organic synthesis, often undergoing various reactions such as nucleophilic addition and oxidation. Understanding its reactivity is crucial for planning synthetic pathways, including transformations to more complex structures like δ-diketones.

Stork Enamine Reaction

The Stork enamine reaction is a method for synthesizing β-dicarbonyl compounds, where an enamine derived from a ketone reacts with an electrophile. This reaction allows for the introduction of new carbon chains at the β-position relative to the carbonyl group, facilitating the formation of δ-diketones. Familiarity with this reaction is essential for converting cyclohexanone into the desired product.

Diketones

Diketones are organic compounds containing two carbonyl groups (C=O) within the same molecule, typically positioned at different locations. They are important in various chemical reactions and can serve as key intermediates in organic synthesis. Understanding the structure and reactivity of diketones is vital for predicting the outcomes of reactions involving cyclohexanone and for designing synthetic routes to achieve specific diketone products.