The acyclic dicarbonyl compound that can be used to synthesize the given cyclic β-keto aldehyde is to be drawn. Concept introduction: The intramolecular Claisen condensation of the diester, on treatment with a strong base, leads to form the β-keto ester. This is known as the Dieckmann condensation reaction. the α carbon of the carbonyl compound has an acidic proton, which can be easily abstracted by the strong base. The carbanion is formed, which is resonance stabilized with corresponding more stable enolate form. This enolate adds the second carbonyl carbon of the diester, and simultaneously, the alkoxide group ( RO - ) is eliminated to form the β-keto ester as the product. So the Dieckmann condensation involves intramolecular nucleophilic addition-elimination reaction. In most of the cyclization reaction, Dieckmann condensation occurs. Dieckmann condensation does not occur when the ring size is less than five-member or more than eight members due to angle strain. The proton of α carbon of the ketones and aldehydes is more acidic than that of ester.

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Answer 1

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.29P

Interpretation Introduction

Interpretation:

The acyclic dicarbonyl compound that can be used to synthesize the given cyclic β-keto aldehyde is to be drawn.

Concept introduction:

The intramolecular Claisen condensation of the diester, on treatment with a strong base, leads to form the β-keto ester. This is known as the Dieckmann condensation reaction. the α carbon of the carbonyl compound has an acidic proton, which can be easily abstracted by the strong base. The carbanion is formed, which is resonance stabilized with corresponding more stable enolate form. This enolate adds the second carbonyl carbon of the diester, and simultaneously, the alkoxide group (RO-) is eliminated to form the β-keto ester as the product. So the Dieckmann condensation involves intramolecular nucleophilic addition-elimination reaction. In most of the cyclization reaction, Dieckmann condensation occurs. Dieckmann condensation does not occur when the ring size is less than five-member or more than eight members due to angle strain. The proton of α carbon of the ketones and aldehydes is more acidic than that of ester.

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Answer 2

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.29P

Interpretation Introduction

Interpretation:

The acyclic dicarbonyl compound that can be used to synthesize the given cyclic β-keto aldehyde is to be drawn.

Concept introduction:

The intramolecular Claisen condensation of the diester, on treatment with a strong base, leads to form the β-keto ester. This is known as the Dieckmann condensation reaction. the α carbon of the carbonyl compound has an acidic proton, which can be easily abstracted by the strong base. The carbanion is formed, which is resonance stabilized with corresponding more stable enolate form. This enolate adds the second carbonyl carbon of the diester, and simultaneously, the alkoxide group (RO-) is eliminated to form the β-keto ester as the product. So the Dieckmann condensation involves intramolecular nucleophilic addition-elimination reaction. In most of the cyclization reaction, Dieckmann condensation occurs. Dieckmann condensation does not occur when the ring size is less than five-member or more than eight members due to angle strain. The proton of α carbon of the ketones and aldehydes is more acidic than that of ester.

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Answer 3

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.29P

Interpretation Introduction

Interpretation:

The acyclic dicarbonyl compound that can be used to synthesize the given cyclic β-keto aldehyde is to be drawn.

Concept introduction:

The intramolecular Claisen condensation of the diester, on treatment with a strong base, leads to form the β-keto ester. This is known as the Dieckmann condensation reaction. the α carbon of the carbonyl compound has an acidic proton, which can be easily abstracted by the strong base. The carbanion is formed, which is resonance stabilized with corresponding more stable enolate form. This enolate adds the second carbonyl carbon of the diester, and simultaneously, the alkoxide group (RO-) is eliminated to form the β-keto ester as the product. So the Dieckmann condensation involves intramolecular nucleophilic addition-elimination reaction. In most of the cyclization reaction, Dieckmann condensation occurs. Dieckmann condensation does not occur when the ring size is less than five-member or more than eight members due to angle strain. The proton of α carbon of the ketones and aldehydes is more acidic than that of ester.

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Answer 4

Question

Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 21, Problem 21.29P

Interpretation Introduction