Textbook Question
What is the major product formed when the following compounds undergo an E1 reaction?
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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 35a
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 35aChapter 10, Problem 35a
What is the major product formed when the following compounds undergo an E1 reaction?
a. 
Verified step by step guidance1
Step 1: Identify the reaction type. The problem specifies an E1 reaction, which is a unimolecular elimination reaction. In an E1 reaction, the rate-determining step involves the formation of a carbocation intermediate after the leaving group departs.
Step 2: Analyze the structure of the compound. The given compound is a tertiary alkyl bromide, which is ideal for an E1 reaction because tertiary carbocations are more stable due to hyperconjugation and inductive effects.
Step 3: Determine the leaving group. Bromine (Br) is the leaving group in this molecule. It will depart, forming a carbocation at the tertiary carbon.
Step 4: Consider the possible rearrangements and stability of the carbocation. Since the carbocation is already tertiary, no rearrangement is necessary. The tertiary carbocation is stable and will proceed to the next step.
Step 5: Identify the major product. In an E1 reaction, the elimination of a proton from a β-carbon occurs, forming a double bond. The major product will be the most substituted alkene (Zaitsev's rule), which is formed by removing a proton from the β-carbon that leads to the most stable alkene.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
E1 Reaction Mechanism
The E1 reaction mechanism is a type of elimination reaction that occurs in two steps. The first step involves the formation of a carbocation intermediate after the leaving group departs, while the second step involves the removal of a proton to form a double bond. This mechanism is favored in tertiary and some secondary substrates due to the stability of the carbocation formed.
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Drawing the E1 Mechanism.
Carbocation Stability
Carbocation stability is a crucial factor in determining the outcome of E1 reactions. Tertiary carbocations are more stable than secondary or primary ones due to hyperconjugation and inductive effects from surrounding alkyl groups. The more stable the carbocation, the more likely it is to form, influencing the major product of the reaction.
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05:58Determining Carbocation Stability
Regioselectivity in Elimination Reactions
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others. In E1 reactions, the formation of the double bond can lead to different alkene products depending on the stability of the resulting alkenes. The more substituted alkene is typically favored due to greater stability, following Zaitsev's rule.
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Related Practice
Textbook Question
a. What is the major product obtained when each of the following compounds undergoes an E2 reaction with methoxide ion? Show the configuration of the product.
b. Does the product obtained depend on whether you start with the R or S enantiomer of the reactant?
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Textbook Question
a. What is the major product obtained when each of the following compounds undergoes an E2 reaction with methoxide ion? Show the configuration of the product.
b. Does the product obtained depend on whether you start with the R or S enantiomer of the reactant?
1.
5
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Textbook Question
Why do cis-1-bromo-2-ethylcyclohexane and trans-1-bromo-2-ethylcyclohexane form different major products when they undergo an E2 reaction?
1
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Textbook Question
For each of the following reactions, (1) decide whether an E2 or an E1 occurs, and (2) draw the major elimination product:
a.
b.
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Textbook Question
What is the major product formed when the following compounds undergo an E1 reaction?
b.
2
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