Textbook Question
What are the answers to Problem 29 when the same compounds are treated with Br2 at 125 °C?
c.
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Ch. 12 - Radicals
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
Chapter 13, Problem 31a
What is the major product of the following reactions? Disregard stereoisomers:
a. 
Verified step by step guidance1
Step 1: Recognize the reagents and reaction conditions. NBS (N-Bromosuccinimide) in the presence of peroxide and heat is commonly used for allylic bromination. This reaction selectively replaces a hydrogen atom at the allylic position (a carbon adjacent to a double bond) with a bromine atom.
Step 2: Identify the allylic positions in the given molecule. The starting material is cyclopentene, which has two allylic positions: one on each carbon adjacent to the double bond.
Step 3: Determine the most reactive allylic position. Both allylic positions in cyclopentene are equivalent due to symmetry, so bromination can occur at either position.
Step 4: Predict the major product. Bromination at the allylic position will result in the formation of 3-bromocyclopentene. Since stereoisomers are disregarded, only the structure of the major product is considered.
Step 5: Understand the mechanism. The reaction proceeds via a radical mechanism initiated by the peroxide and heat. The peroxide generates bromine radicals, which abstract an allylic hydrogen to form an allylic radical. The allylic radical then reacts with bromine to form the brominated product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reaction Mechanisms
Understanding reaction mechanisms is crucial in organic chemistry as they describe the step-by-step process by which reactants transform into products. This includes identifying intermediates, transition states, and the types of bonds formed or broken during the reaction. Familiarity with common mechanisms, such as nucleophilic substitution or elimination, helps predict the major products of a reaction.
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Functional Groups
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups allows chemists to predict reactivity and the types of reactions that can occur. For example, alcohols, carboxylic acids, and amines each have distinct behaviors in reactions, influencing the final products formed.
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Regioselectivity
Regioselectivity refers to the preference of a chemical reaction to occur at one location over another in a molecule. This concept is essential when predicting the major product of a reaction, as certain pathways may lead to more stable or favorable products based on the structure of the reactants. Understanding regioselectivity helps in determining which isomer will be predominantly formed in a reaction.
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Related Practice
Textbook Question
What is the major product of the following reactions? Disregard stereoisomers:
b.
998
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Textbook Question
What is the major product of the following reactions? Disregard stereoisomers:
d.
1723
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Textbook Question
What is the major product obtained from treating an excess of each of the following compounds with Cl2 in the presence of ultraviolet light at room temperature? Disregard stereoisomers.
a.
718
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Textbook Question
What is the major product obtained from treating an excess of each of the following compounds with Cl2 in the presence of ultraviolet light at room temperature? Disregard stereoisomers.
c.
1160
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Textbook Question
What is the major product of the following reactions? Disregard stereoisomers:
c.
1411
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