Textbook Question
Rank the following alkyl halides from most reactive to least reactive in an SN1 reaction:
2-bromo-2-methylpentane, 2-chloro-2-methylpentane, 3-chloropentane, and 2-iodo-2-methylpentane.
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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 22c
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 22cChapter 10, Problem 22c
What is the major elimination product obtained from the reaction of each of the following alkyl halides with hydroxide ion?
c. 
Verified step by step guidance1
Step 1: Identify the type of alkyl halide in the given structure. The molecule contains a bromine atom attached to a tertiary carbon, making it a tertiary alkyl halide. This is important because tertiary alkyl halides typically undergo elimination reactions via the E2 or E1 mechanism.
Step 2: Recall the elimination reaction mechanism. In the presence of a strong base like hydroxide ion (OH⁻), the reaction will likely proceed via the E2 mechanism. This involves the removal of a proton (β-hydrogen) from a carbon adjacent to the carbon bearing the leaving group (bromine), and simultaneous departure of the leaving group.
Step 3: Identify the β-hydrogens available for elimination. In the given structure, the β-hydrogens are located on the carbons adjacent to the carbon bonded to bromine. Analyze the structure to determine which β-hydrogens are accessible and which elimination pathway leads to the most stable alkene.
Step 4: Consider the stability of the possible alkene products. The major product of an elimination reaction is typically the more substituted alkene, as it is more stable due to hyperconjugation and alkyl group stabilization. In this case, elimination of a β-hydrogen from the carbon adjacent to the bromine will result in the formation of a double bond in the ring structure.
Step 5: Draw the major elimination product. The double bond will form between the carbon bearing the bromine and the adjacent carbon that loses a β-hydrogen. The resulting product will be a cyclobutene derivative with the double bond in the ring, as this is the most stable configuration.
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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 a leaving group and a hydrogen atom from adjacent carbon atoms, resulting in the formation of a double bond. In organic chemistry, these reactions are often classified as E1 or E2 mechanisms, depending on whether they occur in a stepwise or concerted manner. The nature of the alkyl halide and the base used can influence the pathway and the product distribution.
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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 is because more substituted alkenes are generally more stable due to hyperconjugation and the inductive effect. Understanding this rule helps predict the outcome of elimination reactions, especially when multiple alkene products are possible.
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Regioselectivity
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others when multiple products are possible. In the context of elimination reactions, regioselectivity is influenced by factors such as sterics and stability of the resulting alkenes. Recognizing which alkene is favored can guide chemists in predicting the major product of a reaction involving alkyl halides.
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Related Practice
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 of the following reactions take place more rapidly when the concentration of the nucleophile is increased?
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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 the reaction of each of the following alkyl halides with hydroxide ion?
a.
b.
1
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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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