Textbook Question
Predict the product of the Diels–Alder reactions shown.
(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 34c
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) 
Verified step by step guidance1
Understand the terms: In organic chemistry, 's-cis' and 's-trans' refer to the relative positions of substituents around a single bond in a conjugated diene. 's-cis' means the substituents are on the same side, while 's-trans' means they are on opposite sides.
Examine the structure of the given diene. Identify the single bond between the two double bonds in the diene. This is the bond around which the conformation is determined.
Look at the substituents attached to the single bond. Determine if they are on the same side (s-cis) or on opposite sides (s-trans) of the single bond.
If the diene is in the s-trans conformation, consider the possibility of rotating around the single bond to convert it to the s-cis conformation. Note that steric hindrance or other structural constraints may prevent this rotation.
Draw the diene in the s-cis conformation if possible. Ensure that the double bonds remain conjugated and that the overall structure is chemically feasible.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Diene Conformation
Dienes are hydrocarbons with two double bonds. The conformation of a diene refers to the spatial arrangement of these double bonds. In s-cis conformation, the double bonds are on the same side of the single bond connecting them, while in s-trans, they are on opposite sides. This affects the molecule's reactivity and stability.
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03:29
Understanding what a conformer is.
Steric Hindrance
Steric hindrance occurs when atoms within a molecule are positioned such that they physically impede each other's spatial arrangement. In the context of dienes, steric hindrance can prevent the molecule from adopting certain conformations, such as s-cis, due to the repulsion between bulky groups attached to the double bonds.
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Guided course
02:53Understanding steric effects.
Conformational Isomerism
Conformational isomerism involves different spatial orientations of a molecule that can be interconverted by rotation around single bonds. For dienes, the ability to switch between s-cis and s-trans conformations is an example of this isomerism, which can influence the molecule's chemical properties and reactions.
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03:29Understanding what a conformer is.
Related Practice
Textbook Question
Provide a mechanism of the Diels–Alder reaction shown and predict the regioisomer that will form.
1137
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Textbook Question
Predict the product of the following sigmatropic rearrangements. Be sure to rationalize the stereochemical outcome with a chair-like transition state.
(b)
1302
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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.]
(e)
1163
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Textbook Question
Predict the product of the following electrocyclic reactions.
(c)
1022
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Textbook Question
Predict the product of the following sigmatropic rearrangements. Be sure to rationalize the stereochemical outcome with a chair-like transition state.
(d)
1015
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