Organic Chemistry-Package(Custom)
Organic Chemistry-Package(Custom)
4th Edition
ISBN: 9781259141089
Author: SMITH
Publisher: MCG
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Chapter 24, Problem 24.24P

Draw the products when each pair of compounds is treated with CH 3 CH 2 O , CH 3 CH 2 OH in a Robinson annulation reaction.

a.Chapter 24, Problem 24.24P, Problem 24.25 
Draw the products when each pair of compounds is treated with ,  in a Robinson , example  1 c. Chapter 24, Problem 24.24P, Problem 24.25 
Draw the products when each pair of compounds is treated with ,  in a Robinson , example  2

b.Chapter 24, Problem 24.24P, Problem 24.25 
Draw the products when each pair of compounds is treated with ,  in a Robinson , example  3 d.Chapter 24, Problem 24.24P, Problem 24.25 
Draw the products when each pair of compounds is treated with ,  in a Robinson , example  4

Expert Solution
Check Mark
Interpretation Introduction

(a)

Interpretation: The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is to be drawn.

Concept introduction: The combination of the Michael reaction and intramolecular aldol reaction in which the formation of a ring takes place is known as Robinson annulation reaction.

Answer to Problem 24.24P

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is-

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  1

Explanation of Solution

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown as,

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  2

Figure 1

In this reaction, the carbonyl compound, 2methylcyclopentane1,3dione is treated with a base, CH3CH2O which leads to the elimination of a proton from the αcarbon atom. This elimination leads to the formation of an enolate ion. Then, this enolate ion acts as the nucleophile and undergoes conjugate addition reaction with the βcarbon of the α,βunsaturated carbonyl compound, but3enone that results in the formation of the new carbon-carbon bond and the desired Robinson annulation product.

Conclusion

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown in Figure 1.

Expert Solution
Check Mark
Interpretation Introduction

(b)

Interpretation: The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is to be drawn.

Concept introduction: The combination of the Michael reaction and intramolecular aldol reaction in which the formation of a ring takes place is known as Robinson annulation reaction.

Answer to Problem 24.24P

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is-

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  3

Explanation of Solution

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown as,

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  4

Figure 2

In this reaction, the carbonyl compound, ethyl3oxobutanoate is treated with a base, CH3CH2O which leads to the elimination of a proton from the αcarbon atom. This elimination leads to the formation of an enolate ion. Then, this enolate ion acts as the nucleophile and undergoes conjugate addition reaction with the βcarbon of the α,βunsaturated carbonyl compound, but3enone that results in the formation of the new carbon-carbon bond and the desired Robinson annulation product.

Conclusion

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown in Figure 2.

Expert Solution
Check Mark
Interpretation Introduction

(c)

Interpretation: The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is to be drawn.

Concept introduction: The combination of the Michael reaction and intramolecular aldol reaction in which the formation of a ring takes place is known as Robinson annulation reaction.

Answer to Problem 24.24P

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is-

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  5

Explanation of Solution

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown as,

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  6

Figure 3

In this reaction, the carbonyl compound, cyclopentanone is treated with a base, CH3CH2O which leads to the elimination of a proton from the αcarbon atom. This elimination leads to the formation of an enolate ion. Then, this enolate ion acts as the nucleophile and undergoes conjugate addition reaction with the βcarbon of the α,βunsaturated carbonyl compound, 3methylbut3ene2one that results in the formation of the new carbon-carbon bond and the desired Robinson annulation product.

Conclusion

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown in Figure 3.

Expert Solution
Check Mark
Interpretation Introduction

(d)

Interpretation: The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is to be drawn.

Concept introduction: The combination of the Michael reaction and intramolecular aldol reaction in which the formation of a ring takes place is known as Robinson annulation reaction.

Answer to Problem 24.24P

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is-

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  7

Explanation of Solution

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown as,

Organic Chemistry-Package(Custom), Chapter 24, Problem 24.24P , additional homework tip  8

Figure 4

In this reaction, the carbonyl compound is treated with a base, CH3CH2O which leads to the elimination of a proton from the αcarbon atom. This elimination leads to the formation of an enolate ion. Then, this enolate ion acts as the nucleophile and undergoes conjugate addition reaction with the βcarbon of the α,βunsaturated carbonyl compound, but3enone that results in the formation of the new carbon-carbon bond and the desired Robinson annulation product.

Conclusion

The product that is formed by the Robinson annulation reaction of the given pair of compounds with CH3CH2O, CH3CH2OH is shown in Figure 4.

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Chapter 24 Solutions

Organic Chemistry-Package(Custom)

Ch. 24 - Prob. 24.11PCh. 24 - Prob. 24.12PCh. 24 - Prob. 24.13PCh. 24 - Prob. 24.14PCh. 24 - Problem 24.16 What ester is formed when each...Ch. 24 - What crossed Claisen product is formed from each...Ch. 24 - Prob. 24.17PCh. 24 - Draw the products of each reaction. a. b. Ch. 24 - Problem 24.20 Two steps in a synthesis of the...Ch. 24 - Prob. 24.20PCh. 24 - Problem 24.22 Which of the following compounds can...Ch. 24 - What product is formed when each pair of compounds...Ch. 24 - Problem 24.24 What starting materials are needed...Ch. 24 - Problem 24.25 Draw the products when each pair of...Ch. 24 - Problem 24.27 What starting materials are needed...Ch. 24 - Prob. 24.26PCh. 24 - 24.29 What steps are needed to convert A to B? Ch. 24 - Prob. 24.28PCh. 24 - Prob. 24.29PCh. 24 - 24.31 Draw the product formed in each directed...Ch. 24 - Prob. 24.31PCh. 24 - What starting materials are needed to synthesize...Ch. 24 - Prob. 24.33PCh. 24 - Prob. 24.34PCh. 24 - Prob. 24.35PCh. 24 - 24.36 Identify the structures of C and D in the...Ch. 24 - Prob. 24.37PCh. 24 - Prob. 24.38PCh. 24 - Prob. 24.39PCh. 24 - Draw the product formed from a Claisen reaction...Ch. 24 - Prob. 24.41PCh. 24 - 24.41 Even though B contains three ester groups, a...Ch. 24 - Prob. 24.43PCh. 24 - What starting materials are needed to prepare each...Ch. 24 - 24.44 Vetivone is isolated from vetiver, a...Ch. 24 - Draw the product of each Robinson annulation from...Ch. 24 - Prob. 24.47PCh. 24 - Draw the organic products formed when butanal...Ch. 24 - 24.47 Draw the organic products formed in each...Ch. 24 - 24.48 Fill in the lettered reagents needed for...Ch. 24 - Prob. 24.51PCh. 24 - Prob. 24.52PCh. 24 - Prob. 24.53PCh. 24 - Draw a stepwise mechanism for the following...Ch. 24 - Prob. 24.55PCh. 24 - Prob. 24.56PCh. 24 - Prob. 24.57PCh. 24 - Prob. 24.58PCh. 24 - Prob. 24.59PCh. 24 - Prob. 24.60PCh. 24 - Prob. 24.61PCh. 24 - Prob. 24.62PCh. 24 - Devise a synthesis of each compound from...Ch. 24 - Prob. 24.64PCh. 24 - Prob. 24.65PCh. 24 - Prob. 24.66PCh. 24 - 24.65 Answer the following questions about...Ch. 24 - Prob. 24.68PCh. 24 - Prob. 24.69PCh. 24 - Prob. 24.70PCh. 24 - Prob. 24.71PCh. 24 - 24.70 Draw a stepwise mechanism for the following...Ch. 24 - Prob. 24.73PCh. 24 - Prob. 24.74PCh. 24 - Prob. 24.75P
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