Textbook Question
Predict the product of the following haloalkane syntheses.
(c) HBr↗HOOH
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Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 11 - Properties and Synthesis of Alkyl Halides: Radical ReactionsProblem 11
Mullins 1st EditionCh. 11 - Properties and Synthesis of Alkyl Halides: Radical ReactionsProblem 11Chapter 10, Problem 11
Specify the conditions that would allow the synthesis of the 1° and 3° bromoalkanes from the same starting alkene.
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Identify the starting alkene structure. Determine if it is symmetrical or asymmetrical, as this will influence the regioselectivity of the addition reactions.
For the synthesis of 1° bromoalkane, consider using hydroboration-oxidation followed by halogenation. Hydroboration-oxidation will convert the alkene into an alcohol, which can then be converted into a bromoalkane using PBr₃ or HBr.
For the synthesis of 3° bromoalkane, use Markovnikov addition of HBr to the alkene. This reaction proceeds via a carbocation intermediate, where the bromine will add to the more substituted carbon, resulting in a 3° bromoalkane.
Ensure that the reaction conditions for each synthesis are optimized. For hydroboration-oxidation, use BH₃ and THF followed by H₂O₂ and NaOH. For Markovnikov addition, use HBr in the presence of a peroxide to avoid anti-Markovnikov addition.
Consider stereochemistry and any potential rearrangements during the reactions. For example, carbocation rearrangements can occur during Markovnikov addition, potentially affecting the final product distribution.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Markovnikov's Rule
Markovnikov's Rule predicts the regiochemistry of electrophilic addition reactions to alkenes, stating that the hydrogen atom will attach to the less substituted carbon, while the halide will attach to the more substituted carbon. This rule is crucial for understanding how 3° bromoalkanes can be synthesized from alkenes.
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The 18 and 16 Electron Rule
Anti-Markovnikov Addition
Anti-Markovnikov addition occurs when the halide attaches to the less substituted carbon of the alkene, often facilitated by radical initiators like peroxides. This concept is essential for synthesizing 1° bromoalkanes, as it allows the bromine to add to the terminal carbon of the alkene.
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02:43Anti-Markovnikov addition of alcohols to terminal alkynes yields aldehydes
Radical Mechanism
Radical mechanisms involve the formation of free radicals, which are highly reactive species with unpaired electrons. In the context of bromination, radicals can initiate anti-Markovnikov addition, enabling the formation of 1° bromoalkanes from alkenes under specific conditions, such as the presence of peroxides.
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03:28The mechanism of Radical Polymerization.
Related Practice
Textbook Question
Provide a mechanism for the chlorination of cyclohexane. Be sure to include initiation, propagation, and three possible termination steps.
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Textbook Question
A radical reaction, as it progressed through its propagation steps, involved the following radical species. Suggest which products might form in all possible termination steps (six products are possible).
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Textbook Question
Predict the product of the following haloalkane syntheses.
(e)
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Textbook Question
Halohydrin formation is a stereospecific reaction. Identify the products of halohydrin formation of the following diastereomeric alkenes to demonstrate this stereospecificity.
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Textbook Question
The most stable intermediate forms first. Explain this statement by showing a reaction coordinate diagram for the formation of a 3° carbocation over a 2° carbocation in the following alkene addition reaction.
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