Textbook Question
Predict the product of the following substitution reactions, paying close attention to the stereochemical outcome of the reactions.
(f)
1
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Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes
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
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Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblem 55b
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblem 55bChapter 11, Problem 55b
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(b) 
Verified step by step guidance1
Step 1: Identify the type of elimination reaction. The presence of NaOEt (sodium ethoxide) in EtOH (ethanol) suggests that this is an E2 elimination reaction, which is a one-step process where the base removes a proton from a β-carbon while the leaving group (Br) departs simultaneously.
Step 2: Analyze the stereochemistry of the substrate. The bromine atom is attached to a chiral center, and the elimination will follow the anti-periplanar geometry requirement of the E2 mechanism. This means the β-hydrogen and the leaving group (Br) must be in opposite planes (180° apart).
Step 3: Determine the β-hydrogens available for elimination. The β-carbons are the carbons adjacent to the carbon bonded to the bromine. In this case, there are two β-hydrogens available on the adjacent carbons. Consider the anti-periplanar alignment for each possible elimination pathway.
Step 4: Predict the major product based on Zaitsev's rule. Zaitsev's rule states that the most substituted alkene will be the major product in an elimination reaction. Evaluate the possible alkenes formed and identify the one with the highest degree of substitution.
Step 5: Consider stereochemical outcomes. Since this is an E2 reaction, the stereochemistry of the product will depend on the anti-periplanar geometry of the starting material. Draw the possible products and confirm the stereochemical configuration of the major product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Elimination Reactions
Elimination reactions involve the removal of atoms or groups from a molecule, resulting in the formation of a double bond. The most common types are E1 and E2 mechanisms, which differ in their reaction pathways. Understanding the conditions and mechanisms of these reactions is crucial for predicting the products formed.
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Recognizing Elimination Reactions.
Stereochemistry
Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In elimination reactions, the stereochemical outcome can lead to different products, such as cis or trans isomers. Recognizing the stereochemical implications is essential for accurately predicting the major product.
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Zaitsev's Rule
Zaitsev's Rule states that in elimination reactions, the more substituted alkene is typically the major product. This principle helps predict the outcome of reactions by favoring the formation of more stable alkenes. Understanding this rule is important for determining which product will dominate in elimination reactions.
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Related Practice
Textbook Question
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(d)
2
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Textbook Question
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(c)
1
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Textbook Question
Predict the product of the following substitution reactions, paying close attention to the stereochemical outcome of the reactions.
(e)
1
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Textbook Question
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(f)
2
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Textbook Question
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(a)
7
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