(a) Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized. Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone .

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Answer 1

Question

Chapter 21.10, Problem 29P

Interpretation Introduction

(a)

Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized.

Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

Interpretation Introduction

(b)

Interpretation: The alkyl halide and ketone needed to prepare nabumetone are to be predicted.

Concept introduction: Carbonyl compounds on treatment with a strong base result in alkylation. The reaction is carried out in two steps: first is the removal of proton by base to generate enolate ion. The second step is the attack of nucleophillic enloate on the alkyl halide, displacing the halide and formation of alkylated product takes place via SN2 mechanism.

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Nabumetone is a pain reliever and anti-inammatory agent sold under the brand name of Relafen.a. Write out a synthesis of nabumetone from ethyl acetoacetate.b. What ketone and alkyl halide are needed to synthesize nabumetone by direct enolate alkylation?

Nabumetone is a pain reliever and anti-inflammatory agent sold under the brand name of Relafen.a. Write out a synthesis of nabumetone from ethyl acetoacetate.b. What ketone and alkyl halide are needed to synthesize nabumetone by direct enolate alkylation?

Answer the following questions about benzphetamine, a habit-forming diet pill sold under the trade name Didrex. a. Label the stereogenic center(s). b. What amide(s) can be reduced to form benzphetamine? c. What carbonyl compound and amine can be used to make benzphetamine by reductive amination? Draw all possible methods. d. What products are formed by Hofmann elimination from benzphetamine? Label the major product. benzphetamine

Answer 2

Question

Chapter 21.10, Problem 29P

Interpretation Introduction

(a)

Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized.

Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

Interpretation Introduction

(b)

Interpretation: The alkyl halide and ketone needed to prepare nabumetone are to be predicted.

Concept introduction: Carbonyl compounds on treatment with a strong base result in alkylation. The reaction is carried out in two steps: first is the removal of proton by base to generate enolate ion. The second step is the attack of nucleophillic enloate on the alkyl halide, displacing the halide and formation of alkylated product takes place via SN2 mechanism.

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Answer 3

Question

Chapter 21.10, Problem 29P

Interpretation Introduction

(a)

Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized.

Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

Interpretation Introduction

(b)

Interpretation: The alkyl halide and ketone needed to prepare nabumetone are to be predicted.

Concept introduction: Carbonyl compounds on treatment with a strong base result in alkylation. The reaction is carried out in two steps: first is the removal of proton by base to generate enolate ion. The second step is the attack of nucleophillic enloate on the alkyl halide, displacing the halide and formation of alkylated product takes place via SN2 mechanism.

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Answer 4

Question

Chapter 21.10, Problem 29P

Interpretation Introduction

(a)

Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized.

Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

Interpretation Introduction

(b)

Interpretation: The alkyl halide and ketone needed to prepare nabumetone are to be predicted.

Concept introduction: Carbonyl compounds on treatment with a strong base result in alkylation. The reaction is carried out in two steps: first is the removal of proton by base to generate enolate ion. The second step is the attack of nucleophillic enloate on the alkyl halide, displacing the halide and formation of alkylated product takes place via SN2 mechanism.

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Answer 5

Chapter 21.10, Problem 29P

Interpretation Introduction

(a)

Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized.

Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

Interpretation Introduction

(b)

Interpretation: The alkyl halide and ketone needed to prepare nabumetone are to be predicted.

Concept introduction: Carbonyl compounds on treatment with a strong base result in alkylation. The reaction is carried out in two steps: first is the removal of proton by base to generate enolate ion. The second step is the attack of nucleophillic enloate on the alkyl halide, displacing the halide and formation of alkylated product takes place via SN2 mechanism.

Answer 6

Chapter 21.10, Problem 29P

Interpretation Introduction

(a)

Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized.

Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

Answer 7

Chapter 21.10, Problem 29P

Interpretation Introduction

(a)

Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized.

Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

Answer 8

Interpretation Introduction

(b)

Interpretation: The alkyl halide and ketone needed to prepare nabumetone are to be predicted.

Concept introduction: Carbonyl compounds on treatment with a strong base result in alkylation. The reaction is carried out in two steps: first is the removal of proton by base to generate enolate ion. The second step is the attack of nucleophillic enloate on the alkyl halide, displacing the halide and formation of alkylated product takes place via SN2 mechanism.

Answer 9

Interpretation Introduction

(b)

Interpretation: The alkyl halide and ketone needed to prepare nabumetone are to be predicted.

Concept introduction: Carbonyl compounds on treatment with a strong base result in alkylation. The reaction is carried out in two steps: first is the removal of proton by base to generate enolate ion. The second step is the attack of nucleophillic enloate on the alkyl halide, displacing the halide and formation of alkylated product takes place via SN2 mechanism.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 21.2 - Problem 23.1 Draw the enol or keto tautomer(s) of...Ch. 21.2 - Problem 23.3 When phenylacetaldehyde is dissolved...Ch. 21.3 - Prob. 5P Ch. 21.3 - Problem 23.5 Which bonds in the following...Ch. 21.3 - Prob. 7P Ch. 21.3 - Prob. 8P Ch. 21.3 - Prob. 9P Ch. 21.4 - Prob. 10P Ch. 21.5 - Prob. 11P Ch. 21.7 - Problem 23.11 Draw the products of each...

(a) Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized. Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone .

Solution Summary: The author explains the synthesis of nabumetone from ethyl acetoacetate.

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Chapter 21 Solutions

Solution Summary: The author explains the synthesis of nabumetone from ethyl acetoacetate.

Concept explainers

(a) Interpretation: Nabumetone from ethyl acetoacetate is to be synthesized. Concept introduction: The α hydrogen attached to the β- ketoester is acidic in nature and the hydrolysis and decarboxylation of the product obtained by substitution reaction of enolate ion with alkyl halide gives ketone.

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Chapter 21 Solutions