Textbook Question
What are the products of the following reactions, assuming that one equivalent of each reagent is used in each reaction?
b.
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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 Benzene
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. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of BenzeneProblem 28c
Bruice 8th EditionCh. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of BenzeneProblem 28cChapter 9, Problem 28c
What are the products of the following reactions, assuming that one equivalent of each reagent is used in each reaction?
c. 
Verified step by step guidance1
Analyze the structure of the starting material: The molecule is a substituted benzene ring with an isopropyl group attached to the aromatic ring. This is known as isopropylbenzene or cumene.
Identify the reagent: Chlorine (Cl₂) is used in the reaction, and the absence of light or heat suggests that this is an electrophilic aromatic substitution reaction rather than a free radical halogenation.
Understand the mechanism: In electrophilic aromatic substitution, the chlorine molecule reacts with the aromatic ring, and one hydrogen atom is replaced by a chlorine atom. The isopropyl group is an electron-donating group, which activates the aromatic ring and directs substitution to the ortho and para positions relative to the isopropyl group.
Predict the products: Since one equivalent of chlorine is used, the reaction will yield a mixture of ortho-chlorocumene and para-chlorocumene as the major products. The meta position is less favored due to the electron-donating effect of the isopropyl group.
Consider regioselectivity: The para product is typically favored over the ortho product due to steric hindrance at the ortho position caused by the bulky isopropyl group.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Conjugated Systems
Conjugated systems consist of alternating single and double bonds, allowing for delocalization of π electrons. This delocalization stabilizes the molecule and can influence its reactivity. In the context of the reaction shown, the conjugated diene can undergo electrophilic addition, where reagents like Cl2 can add across the double bonds.
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Conjugated states
Electrophilic Addition
Electrophilic addition is a reaction mechanism where an electrophile reacts with a nucleophile, resulting in the addition of atoms or groups to a molecule. In this case, Cl2 acts as an electrophile that adds to the double bonds of the conjugated system, leading to the formation of vicinal dihalides. Understanding this mechanism is crucial for predicting the products of the reaction.
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Regioselectivity
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others when multiple possibilities exist. In the reaction with Cl2, the regioselectivity will determine which carbon atoms in the conjugated system will bond with chlorine, influencing the final product's structure. This concept is essential for accurately predicting the outcome of the reaction.
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Related Practice
Textbook Question
Which of the double bonds in zingiberene, the compound responsible for the aroma of ginger, is most reactive in an electrophilic addition reaction with HBr?
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Textbook Question
What are the products of the following reactions, assuming that one equivalent of each reagent is used in each reaction? Disregard stereoisomers.
a.
701
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Textbook Question
What products would be obtained from the reaction of 1,3,5-hexatriene with one equivalent of HBr? Disregard stereoisomers.
1049
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Textbook Question
What is the major product of each of the following reactions, assuming that one equivalent of each reagent is used in each reaction?
b.
1285
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Textbook Question
What is the major product of each of the following reactions, assuming that one equivalent of each reagent is used in each reaction?
c.
1752
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