Textbook Question
In each Diels–Alder reaction shown, predict the product that will result.(a)
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Ch. 22 - Conjugated Systems II: Pericyclic Reactions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
Chapter 21, Problem 15c
Assuming the diene approaches the dienophile from the top, predict the product of the following Diels–Alder reactions.
(c) 
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Identify the diene and dienophile in the reaction. The diene is a conjugated system with two double bonds, and the dienophile is typically an alkene or alkyne that will react with the diene.
Consider the stereochemistry of the reaction. The Diels–Alder reaction is a [4+2] cycloaddition, meaning four π electrons from the diene and two π electrons from the dienophile participate in forming a six-membered ring.
Visualize the approach of the diene to the dienophile from the top. This orientation can affect the stereochemistry of the product, often leading to endo or exo products. The endo product is typically favored due to secondary orbital interactions.
Draw the transition state where the diene and dienophile are aligned to form new σ bonds. The new bonds will form between the ends of the diene and the ends of the dienophile, resulting in a cyclohexene ring.
Predict the stereochemistry of the product based on the approach. If the diene approaches from the top, substituents on the dienophile may end up on the same side of the newly formed ring, influencing the final stereochemistry of the 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, typically an alkene or alkyne, to form a six-membered ring. This reaction is stereospecific and occurs in a concerted manner, meaning all bond-making and bond-breaking processes happen simultaneously. It is a key reaction in organic synthesis for constructing complex cyclic structures.
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Diels-Alder Retrosynthesis
Stereochemistry in Diels–Alder Reactions
Stereochemistry is crucial in Diels–Alder reactions as the relative orientation of substituents on the diene and dienophile affects the stereochemistry of the product. The reaction is stereospecific, preserving the stereochemistry of the reactants. The diene can approach the dienophile from either the top or bottom face, leading to different stereoisomers, which is important for predicting the product's configuration.
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Endo and Exo Products
In Diels–Alder reactions, the terms 'endo' and 'exo' describe the relative positions of substituents in the product. The endo product is typically favored due to secondary orbital interactions, where substituents on the dienophile are oriented towards the diene's π-system. Understanding these interactions helps predict which product will be predominant under kinetic control, especially when the diene approaches from a specific direction.
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Related Practice
Textbook Question
Predict the product of the following Diels–Alder reactions. Where a racemic mixture is produced, show both enantiomers and explain how each is formed.
(d)
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Textbook Question
In each Diels–Alder reaction shown, predict the product that will result.
(c)
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Textbook Question
Figure 22.16(a) <IMAGE> shows a unique example where the Diels–Alder reaction gives a single product (no enantiomers) regardless of whether the diene attacks the dienophile from the top or bottom.
(a) Show the product of the diene attacking from the bottom and confirm that the same product is obtained.
(b) What is special about this product that makes this true?
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Textbook Question
Give the diene and dienophile that could be used to make the following Diels–Alder products.
(c)
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Textbook Question
In each Diels–Alder reaction shown, predict the product that will result.
(a)
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