Domanda del libro di testo
Provide a mechanism of the Diels–Alder reaction shown and predict the regioisomer that will form.
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Ch. 22 - Conjugated Systems 2: Pericyclic Reactions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- 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 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: 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 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: 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: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 22 - Conjugated Systems 2: Pericyclic ReactionsProblema 32d
Mullins 1st EditionCh. 22 - Conjugated Systems 2: Pericyclic ReactionsProblema 32dCapitolo 21, Problema 32d
Predict the product of the following sigmatropic rearrangements. Be sure to rationalize the stereochemical outcome with a chair-like transition state.
(d) 
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Identify the type of sigmatropic rearrangement involved. Sigmatropic rearrangements are pericyclic reactions where a sigma bond is shifted along with the pi system. Common examples include [1,5]- and [3,3]-sigmatropic shifts.
Determine the number of atoms involved in the rearrangement. For example, a [3,3]-sigmatropic rearrangement involves a six-membered transition state, which is often chair-like.
Draw the chair-like transition state. In a chair conformation, consider the stereochemistry of substituents. Axial and equatorial positions can influence the stereochemical outcome of the product.
Analyze the stereochemistry of the starting material and how it affects the transition state. Ensure that substituents are placed in positions that minimize steric hindrance and maximize stability.
Predict the product by completing the rearrangement in the chair-like transition state. Consider the stereochemical configuration of the product based on the positions of substituents in the transition state.
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Sigmatropic Rearrangements
Sigmatropic rearrangements are a type of pericyclic reaction where a sigma bond adjacent to one or more pi systems migrates across the molecule. These reactions are classified by the number of atoms involved in the migration, denoted as [i,j]-shifts. Understanding the nature of these shifts is crucial for predicting the structural changes in the product.
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03:20
Nomenclature of Sigmatropic Shifts
Chair-like Transition State
A chair-like transition state is a conformation that resembles the chair form of cyclohexane, often adopted during pericyclic reactions to minimize steric strain and maximize orbital overlap. This conformation is particularly relevant in sigmatropic rearrangements, as it helps rationalize the stereochemical outcome by providing a stable, low-energy pathway for the reaction.
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06:55Intermediates vs. Transition States
Stereochemistry in Pericyclic Reactions
Stereochemistry in pericyclic reactions is governed by the conservation of orbital symmetry, as described by the Woodward-Hoffmann rules. These rules predict the stereochemical outcome based on the symmetry of the molecular orbitals involved. In sigmatropic rearrangements, understanding how the transition state influences stereochemistry is essential for predicting the configuration of the product.
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07:37Properties and Types of Pericyclic Reactions
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Predict the product of the following sigmatropic rearrangements. Be sure to rationalize the stereochemical outcome with a chair-like transition state.
(b)
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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.]
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Predict the product of the following electrocyclic reactions.
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