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 31
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 31Chapter 9, Problem 31
What products would be obtained from the reaction of 1,3,5-hexatriene with one equivalent of HBr? Disregard stereoisomers.
Verified step by step guidance1
Identify the type of reaction: The reaction involves the addition of HBr to 1,3,5-hexatriene, which is a conjugated diene system. This is an electrophilic addition reaction.
Determine the mechanism: The reaction proceeds via the Markovnikov addition mechanism, where the proton (H⁺) from HBr adds to the carbon in the conjugated system that will generate the most stable carbocation intermediate.
Analyze the conjugated system: 1,3,5-hexatriene has alternating double and single bonds. When H⁺ adds to one of the terminal carbons of the conjugated system, it creates a carbocation that can delocalize over the conjugated π-system, forming resonance-stabilized intermediates.
Add the bromide ion (Br⁻): After the carbocation is formed, the bromide ion (Br⁻) will attack the positively charged carbon in the most stable resonance structure, leading to the formation of the final product.
Determine the product: The product will be a bromoalkene where the bromine atom is attached to the carbon that was part of the most stable carbocation intermediate. Disregard stereoisomers as instructed.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Electrophilic Addition
Electrophilic addition is a fundamental reaction mechanism in organic chemistry where an electrophile reacts with a nucleophile, typically involving alkenes or alkynes. In the case of 1,3,5-hexatriene, the double bonds act as nucleophiles, attacking the electrophilic hydrogen in HBr, leading to the formation of a more stable carbocation intermediate.
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1,2 vs 1,4 Addition
Carbocation Stability
Carbocation stability is crucial in determining the outcome of reactions involving electrophilic addition. Carbocations are positively charged species, and their stability increases with the degree of substitution; tertiary carbocations are more stable than secondary or primary. In the reaction of 1,3,5-hexatriene with HBr, the formation of the most stable carbocation will influence the final product distribution.
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Markovnikov's Rule
Markovnikov's Rule states that in the addition of HX to an alkene, the hydrogen atom will attach to the carbon with the greater number of hydrogen atoms already attached. This rule helps predict the major product of the reaction between 1,3,5-hexatriene and HBr, guiding the formation of the more stable product based on the carbocation formed during 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.
b.
1343
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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 are the products of the following reactions, assuming that one equivalent of each reagent is used in each reaction?
c.
1286
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Textbook Question
A student wanted to know whether the greater proximity of the nucleophile to the C-2 carbon in the transition state is what causes the 1,2-addition product to be formed faster when 1,3-butadiene reacts with HCl. Therefore, she decided to investigate the reaction of 2-methyl-1,3-cyclohexadiene with HCl. Her friend told her that she should use 1-methyl-1,3-cyclohexadiene instead. Should she follow her friend's advice?
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