Domanda del libro di testo
Predict the product of the following electrocyclic reactions.
(a)
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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 32b
Mullins 1st EditionCh. 22 - Conjugated Systems 2: Pericyclic ReactionsProblema 32bCapitolo 21, Problema 32b
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 type of sigmatropic rearrangement involved. Sigmatropic rearrangements are classified by the number of atoms involved in the shift. For example, a [3,3]-sigmatropic rearrangement involves a shift of three atoms from each side of the breaking and forming bonds.
Draw the initial structure and identify the bonds that will break and form during the rearrangement. This will help visualize the movement of atoms and electrons.
Consider the stereochemistry of the transition state. Sigmatropic rearrangements often proceed through a chair-like transition state, especially in cyclic systems. Draw the chair conformation and place substituents accordingly to minimize steric hindrance and maximize stability.
Analyze the stereochemical outcome based on the transition state. The chair-like transition state can dictate the stereochemistry of the product due to the spatial arrangement of substituents. Ensure that the substituents are positioned to avoid 1,3-diaxial interactions, which are less stable.
Predict the final product structure, taking into account the stereochemical preferences observed in the transition state. Ensure that the product reflects the correct connectivity and stereochemistry as dictated by the rearrangement process.
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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 characterized by the conservation of the total number of pi and sigma bonds and often involve a cyclic transition state. Understanding the specific type of sigmatropic shift, such as [1,5] or [3,3], is crucial for predicting 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 in 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 predictable spatial arrangement of substituents, leading to specific stereoisomers.
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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 whether a reaction will proceed via a suprafacial or antarafacial pathway, influencing the stereochemical configuration of the product. In sigmatropic rearrangements, the stereochemical outcome is often determined by the geometry of the transition state, such as a chair-like conformation.
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07:37Properties and Types of Pericyclic Reactions
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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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Predict the product of the following sigmatropic rearrangements. Be sure to rationalize the stereochemical outcome with a chair-like transition state.
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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.
(b)
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