Textbook Question
Provide a mechanism of the Diels–Alder reaction shown and predict the regioisomer that will form.
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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 36a
Predict the product of the Diels–Alder reactions shown.
(a) 
Verified step by step guidance1
Identify the diene and the dienophile in the reaction. The diene is a conjugated system with two double bonds, and the dienophile is typically an alkene or alkyne with electron-withdrawing groups.
Ensure the diene is in the s-cis conformation, which is necessary for the Diels-Alder reaction to occur. If it is not, consider any possible rotations or conformational changes.
Align the diene and dienophile so that the p orbitals can overlap effectively. This involves bringing the diene and dienophile close together in a way that allows for the formation of new sigma bonds.
Draw the transition state of the reaction, showing the cyclic overlap of the p orbitals. This is a concerted process where bonds are broken and formed simultaneously.
Predict the product by forming a six-membered ring. The new sigma bonds form between the ends of the diene and the dienophile, resulting in a cyclohexene derivative. Consider any stereochemistry involved, as the reaction is stereospecific.
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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 between a conjugated diene and a dienophile, typically forming a six-membered ring. It is a pericyclic reaction that proceeds via a concerted mechanism, meaning bonds are formed simultaneously without intermediates. This reaction is stereospecific, often preserving the stereochemistry of the reactants in the product.
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Diels-Alder Retrosynthesis
Conjugated Diene
A conjugated diene consists of two double bonds separated by a single bond, allowing for electron delocalization across the π-system. This delocalization stabilizes the diene and makes it reactive in cycloaddition reactions like the Diels–Alder. The s-cis conformation of the diene is crucial for effective overlap with the dienophile's π-orbitals during the reaction.
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Dienophile
A dienophile is an alkene or alkyne that reacts with a diene in the Diels–Alder reaction. It typically contains electron-withdrawing groups that enhance its reactivity by making the π-bond more electrophilic. The stereochemistry of the dienophile influences the stereochemistry of the resulting cyclohexene product, making its orientation important in predicting the reaction outcome.
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09:48General Features
Related Practice
Textbook Question
Identify the following dienes as being in the s-cis or s-trans conformation. If they are in the s-trans conformation, draw them in the s-cis conformation. [It may not always be possible.]
(e)
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Textbook Question
Identify the following dienes as being in the s-cis or s-trans conformation. If they are in the s-trans conformation, draw them in the s-cis conformation. [It may not always be possible.]
(c)
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Textbook Question
Draw the products you’d expect to form in Assessment 22.38.
(c)
Textbook Question
Given the conditions, would you expect conrotatory or disrotatory ring closing/opening? Justify this on the basis of the molecular orbital picture.
(c)
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Textbook Question
For the following electrocyclic reactions, did the substituents move in a conrotatory or disrotatory direction? Would you use heat or light to cause movement in this direction?
(a)
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