Textbook Question
What is the major elimination product obtained from the 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 22a,b
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 22a,bChapter 10, Problem 22a,b
What is the major elimination product obtained from the reaction of each of the following alkyl halides with hydroxide ion?
a. 
b. 
Verified step by step guidance1
Step 1: Identify the type of elimination reaction. The reaction involves hydroxide ion (OH⁻), which is a strong base. This suggests that the elimination mechanism is likely E2, where the base abstracts a proton from a β-carbon, and the leaving group departs simultaneously.
Step 2: Analyze the structure of the alkyl halide in part (a). The molecule contains an iodine atom as the leaving group attached to a tertiary carbon. The β-carbons are the carbons adjacent to the carbon bonded to iodine. These β-carbons have hydrogens that can be abstracted by the hydroxide ion.
Step 3: Apply Zaitsev's rule to part (a). Zaitsev's rule states that the major elimination product will be the more substituted alkene. Identify the β-hydrogens on the β-carbons and determine which elimination pathway leads to the more substituted double bond.
Step 4: Analyze the structure of the alkyl halide in part (b). The molecule contains a bromine atom as the leaving group attached to a secondary carbon. The β-carbons adjacent to the carbon bonded to bromine have hydrogens that can be abstracted by the hydroxide ion.
Step 5: Apply Zaitsev's rule to part (b). For part (b), identify the β-hydrogens on the β-carbons and determine which elimination pathway leads to the more substituted alkene. The major product will be the alkene with the highest degree of substitution around the double bond.
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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 small molecule from a larger one, typically resulting in the formation of a double bond. In organic chemistry, these reactions often occur with alkyl halides when treated with strong bases, leading to the formation of alkenes. The two main types of elimination reactions are E1 and E2, which differ in their mechanisms and conditions.
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Recognizing Elimination Reactions.
Zaitsev's Rule
Zaitsev's Rule states that in elimination reactions, the more substituted alkene is generally the major product. This is because more substituted alkenes are more stable due to hyperconjugation and the inductive effect. Understanding this rule helps predict the outcome of elimination reactions involving alkyl halides and bases.
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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 crucial for determining which alkene product will be formed based on the structure of the alkyl halide and the conditions of the reaction, such as the strength of the base used.
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Related Practice
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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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
Draw the stereoisomers that are formed from the following SN1 reactions:
a. 3-bromo-3-methylpentane and methanol
b. 3-chloro-3-methylhexane and methanol
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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?
a.
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