Textbook Question
What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
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Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 23e
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 23eChapter 10, Problem 23e
What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
e. 
Verified step by step guidance1
Step 1: Identify the alkyl halide structure. The given molecule is a cyclohexane ring with a bromine atom attached to one of the carbons. This is a secondary alkyl halide because the carbon bonded to bromine is connected to two other carbons.
Step 2: Recall the mechanism of an E2 reaction. In an E2 elimination, a strong base (here, hydroxide ion) removes a proton from a β-carbon (a carbon adjacent to the carbon bonded to the leaving group), while the leaving group (bromine) departs simultaneously. This results in the formation of a double bond.
Step 3: Determine the β-hydrogens available for elimination. In this case, the β-carbons are the two carbons adjacent to the carbon bonded to bromine. Each β-carbon has hydrogens that can be abstracted by the hydroxide ion.
Step 4: Apply Zaitsev's rule to predict the major product. Zaitsev's rule states that the most substituted alkene will be the major product. Therefore, the double bond will form between the carbon bonded to bromine and the β-carbon that leads to the more substituted alkene.
Step 5: Draw the major elimination product. The double bond will form in the cyclohexane ring, resulting in a more stable, substituted alkene. Ensure the stereochemistry and regiochemistry are consistent with the E2 mechanism.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
E2 Reaction Mechanism
The E2 (bimolecular elimination) reaction is a concerted mechanism where a base abstracts a proton from a β-carbon while a leaving group departs from the α-carbon, resulting in the formation of a double bond. This reaction typically requires strong bases and occurs in a single step, making it essential to understand the stereochemistry and orientation of the substrate.
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Drawing the E2 Mechanism.
Alkyl Halides
Alkyl halides are organic compounds containing a carbon atom bonded to a halogen atom (such as bromine, chlorine, or iodine). Their reactivity in elimination reactions depends on the structure of the alkyl group and the nature of the leaving group. In the case of bromobenzene, the halogen is attached to a benzene ring, which influences the reaction pathway.
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Regioselectivity in Elimination Reactions
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others. In E2 reactions, the formation of the double bond can lead to different products depending on the orientation of the leaving group and the hydrogen being abstracted. Understanding regioselectivity is crucial for predicting the major product in reactions involving complex substrates like bromobenzene.
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Related Practice
Textbook Question
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
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Textbook Question
What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
b.
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Textbook Question
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
a.
b.
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Textbook Question
What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
c.
d.
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Textbook Question
What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
a.
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