Ch. 22 - Conjugated Systems 2: Pericyclic Reactions

Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition

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Mullins 1st Edition

Ch. 22 - Conjugated Systems 2: Pericyclic Reactions

Problema 41b

Capitolo 21, Problema 41b

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

Guida verificata passo dopo passo

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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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.

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Claisen Condensation

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.

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Formation of Enolates

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.

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Oxidative Workup Mechanism:

Pratica correlata

Domanda del libro di testo

Predict the product of the following reactions. [When all of the reactions from this chapter are shown together, you must first decide which type of reaction each is. Is it a Diels–Alder, an electrocyclic, or a sigmatropic rearrangement? Drawing the product will be easier once this determination is made.]

(b)

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Domanda del libro di testo

(a)

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Domanda del libro di testo

Draw the products you’d expect to form in Assessment 22.38.

(c)

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