Textbook Question
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
c.
d.
2
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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 23f
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 23fChapter 10, Problem 23f
What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
f. 
Verified step by step guidance1
Analyze the structure of the alkyl halide provided. The molecule is 3-fluoro-3-methylpentane, which contains a fluorine atom attached to the third carbon of a pentane chain, along with a methyl group also attached to the third carbon.
Understand the mechanism of the E2 reaction. In an E2 elimination, a strong base (hydroxide ion in this case) removes a proton from a β-carbon (a carbon adjacent to the carbon bonded to the leaving group), while the leaving group (fluorine) departs simultaneously, forming a double bond.
Identify the β-hydrogens available for elimination. In this molecule, the β-carbons are the second and fourth carbons. The second carbon has two hydrogens, and the fourth carbon has two hydrogens as well.
Determine the major product based on Zaitsev's rule. Zaitsev's rule states that the more substituted alkene (the one with more alkyl groups attached to the double-bonded carbons) is usually the major product. Elimination of a β-hydrogen from the fourth carbon will result in a more substituted alkene compared to elimination from the second carbon.
Conclude that the major elimination product will involve the formation of a double bond between the third and fourth carbons, resulting in 3-methyl-2-pentene as the major product.
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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 removes a proton (H) from a β-carbon while a leaving group (like Cl) departs from the α-carbon simultaneously. This results in the formation of a double bond between the α and β carbons. The reaction requires strong bases and typically occurs with secondary or tertiary alkyl halides.
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09:36
Drawing the E2 Mechanism.
Zaitsev's Rule
Zaitsev's Rule states that in elimination reactions, the more substituted alkene is usually 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 E2 reactions when multiple elimination products are possible.
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01:18Defining Zaitsev’s Rule
Sterics and Regioselectivity
Sterics refers to the spatial arrangement of atoms in a molecule, which can influence reaction pathways. In E2 reactions, steric hindrance can affect which β-hydrogen is removed, leading to regioselectivity in the formation of alkenes. The less hindered β-hydrogen is often favored, guiding the reaction towards the major product.
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02:53Understanding steric effects.
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.
4
views
Textbook Question
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
a.
b.
6
views
Textbook Question
What is the major elimination product obtained from an E2 reaction of each of the following alkyl halides with hydroxide ion?
e.
1
views
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.
8
views
Textbook Question
Which alkyl halide in each pair is more reactive in an E2 reaction with hydroxide ion?
a.
b.
2
views