Predict the product of the Claisen reactions shown.
(b)

검증된 단계별 안내

Step 1: Understand the Claisen condensation reaction. It involves the reaction between two esters or one ester and a ketone in the presence of a strong base, typically an alkoxide, to form a β-keto ester or a β-diketone.

Step 2: Identify the reactants in the given Claisen reaction. Look for the ester or ketone groups that will participate in the reaction.

Step 3: Determine the base used in the reaction. Common bases include sodium ethoxide (NaOEt) or sodium methoxide (NaOMe). The base deprotonates the α-hydrogen of the ester, forming an enolate ion.

Step 4: Predict the nucleophilic attack. The enolate ion formed will attack the carbonyl carbon of another ester molecule, leading to the formation of a new carbon-carbon bond.

Step 5: Consider the final product formation. After the nucleophilic attack, the intermediate undergoes protonation and elimination of the alkoxide ion, resulting in the formation of a β-keto ester or β-diketone as the final product.

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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.

Claisen Condensation

The Claisen condensation is a reaction where two esters or one ester and a ketone react in the presence of a strong base to form a β-keto ester or a β-diketone. This reaction involves the formation of a new carbon-carbon bond and is crucial for synthesizing complex molecules in organic chemistry.

Enolate Ion Formation

Enolate ions are formed when a strong base deprotonates the α-hydrogen of an ester or ketone, creating a resonance-stabilized anion. This enolate ion acts as a nucleophile in the Claisen condensation, attacking the carbonyl carbon of another ester, leading to the formation of the product.

Acid Workup

After the Claisen condensation, an acid workup is typically performed to neutralize the reaction mixture and protonate the alkoxide intermediate, resulting in the final β-keto ester or β-diketone product. This step is essential to stabilize the product and complete the reaction process.

Predict the product of the Claisen reactions shown. (b)