Textbook Question
Draw the substitution and elimination products for the following reactions, showing the configuration of each product:
c. 1-chloro-1-methylcyclohexane + CH3O−
d. 1-chloro-1-methylcyclohexane + CH3OH
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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 38b
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 38bChapter 10, Problem 38b
Draw the substitution and elimination products for the following reactions, showing the configuration of each product:
b. cis-1-chloro-2-methylcyclohexane + CH3O−
Verified step by step guidance1
Analyze the structure of the starting material, cis-1-chloro-2-methylcyclohexane. The chlorine atom is on one carbon of the cyclohexane ring, and the methyl group is on the adjacent carbon. Both substituents are on the same side of the ring (cis configuration).
Identify the reagent, CH3O− (methoxide ion), which is a strong base and a good nucleophile. This means that both substitution (SN2 or SN1) and elimination (E2 or E1) reactions are possible, depending on the reaction conditions.
For the substitution product: In an SN2 reaction, the methoxide ion will attack the carbon bonded to the chlorine atom (the leaving group) from the opposite side, leading to an inversion of configuration at that carbon. Draw the product with the methoxy group replacing the chlorine, ensuring the stereochemistry reflects the inversion.
For the elimination product: In an E2 reaction, the methoxide ion will abstract a β-hydrogen (a hydrogen on a carbon adjacent to the carbon bearing the chlorine). Since the starting material is in the cis configuration, consider the anti-periplanar geometry required for E2 elimination. Draw the resulting alkene, ensuring the correct stereochemistry of the double bond.
Verify the stereochemistry of all products. For the substitution product, confirm the inversion of configuration. For the elimination product, ensure the double bond is correctly placed and the stereochemistry of the alkene (E or Z) is consistent with the starting material's geometry.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Substitution Reactions
Substitution reactions involve the replacement of one functional group in a molecule with another. In organic chemistry, this often occurs with alkyl halides, where a nucleophile attacks the carbon atom bonded to the leaving group (e.g., Cl) and replaces it. Understanding the mechanism (SN1 or SN2) is crucial, as it influences the stereochemistry and the nature of the products formed.
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Recognizing Substitution Reactions.
Elimination Reactions
Elimination reactions involve the removal of a small molecule (like HCl or H2O) from a larger molecule, resulting in the formation of a double bond. In the context of the given reaction, the base (CH3O−) abstracts a proton, leading to the formation of an alkene. The regioselectivity and stereochemistry of the elimination products depend on the structure of the starting material and the reaction conditions.
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00:40Recognizing Elimination Reactions.
Stereochemistry
Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the context of the given reaction, the configuration of the products (cis or trans) is important, especially when dealing with cyclic compounds like cyclohexane. Understanding how stereochemistry influences reactivity and product formation is essential for predicting the outcomes of substitution and elimination reactions.
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Related Practice
Textbook Question
Which reacts faster in an SN2 reaction?
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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?
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Textbook Question
Which reacts faster in an E1 reaction?
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Textbook Question
Which isomer reacts more rapidly in an E2 reaction: cis-1-bromo-4-tert-butylcyclohexane or trans-1-bromo-4-tert-butylcyclohexane? Explain your answer.
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Textbook Question
Draw the substitution and elimination products for the following reactions, showing the configuration of each product:
a. trans-1-chloro-2-methylcyclohexane + CH3O−
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