Textbook Question
How could the following compounds be synthesized using a Diels–Alder reaction?
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Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of BenzeneProblem 89b
Bruice 8th EditionCh. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of BenzeneProblem 89bChapter 9, Problem 89b
How could the following compounds be synthesized using a Diels–Alder reaction?
b. 
Verified step by step guidance1
Step 1: Identify the product as a bicyclic compound formed via a Diels–Alder reaction. The Diels–Alder reaction involves a conjugated diene and a dienophile reacting to form a cyclohexene derivative.
Step 2: Analyze the structure of the product. The bicyclic system indicates that the reaction involved a cyclic diene. The ester group (CO₂CH₂CH₃) on the product suggests that the dienophile contained an electron-withdrawing group.
Step 3: Determine the diene. The presence of two methyl groups on the diene portion of the product suggests that the diene used was 2,3-dimethyl-1,3-butadiene, which is a conjugated diene.
Step 4: Determine the dienophile. The ester group in the product suggests that the dienophile was ethyl acrylate (CH₂=CHCO₂CH₂CH₃), which contains an electron-withdrawing group that enhances its reactivity in the Diels–Alder reaction.
Step 5: Combine the diene and dienophile. The reaction between 2,3-dimethyl-1,3-butadiene and ethyl acrylate under appropriate conditions (e.g., heat) would yield the bicyclic product shown in the image. The stereochemistry of the product is determined by the endo rule, favoring the formation of the endo product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Diels–Alder Reaction
The Diels–Alder reaction is a [4+2] cycloaddition reaction between a conjugated diene and a dienophile, resulting in the formation of a six-membered ring. This reaction is a powerful tool in organic synthesis due to its ability to create complex cyclic structures with high stereoselectivity and regioselectivity. Understanding the reactivity of both the diene and the dienophile is crucial for predicting the outcome of the reaction.
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Diels-Alder Retrosynthesis
Diene and Dienophile
In the context of the Diels–Alder reaction, a diene is a molecule that contains two double bonds, which can participate in the reaction, while a dienophile is a compound that contains a double or triple bond and reacts with the diene. The choice of diene and dienophile significantly influences the reaction's efficiency and the stereochemistry of the product. Recognizing suitable pairs is essential for successful synthesis.
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04:43Drawing MO Diagram for Dienes
Retrosynthetic Analysis
Retrosynthetic analysis is a method used in organic chemistry to deconstruct a target molecule into simpler precursor structures. This approach helps chemists identify potential synthetic routes, including the use of reactions like the Diels–Alder. By analyzing the target compound's structure, one can determine the necessary diene and dienophile, facilitating the planning of the synthesis.
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Related Practice
Textbook Question
A student obtained two products from the reaction of 1,3-cyclohexadiene with Br2 (disregarding stereoisomers). His lab partner was surprised when he obtained only one product from the reaction of 1,3-cyclohexadiene with HBr (disregarding stereoisomers). Account for these results.
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Textbook Question
How could you synthesize the following compound from starting materials containing no more than six carbons?
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Textbook Question
How could the following compounds be synthesized using a Diels–Alder reaction?
d.
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Textbook Question
How could the following compounds be synthesized using a Diels–Alder reaction?
a.
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Textbook Question
a. How could each of the following compounds be prepared from a hydrocarbon in a single step?
b. What other organic compound would be obtained from each synthesis?
1.
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