Textbook Question
Predict the major products of the following alkane halogenation reactions. [The number of products shown ignores the formation of racemic mixtures.]
(b)
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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 22c
Mullins 1st EditionCh. 11 - Properties and Synthesis of Alkyl Halides: Radical ReactionsProblem 22cChapter 10, Problem 22c
Predict the major products of the following alkane halogenation reactions. [The number of products shown ignores the formation of racemic mixtures.]
(c) 
Verified step by step guidance1
Identify the type of reaction: This is a free radical halogenation reaction involving chlorine (Cl₂) and heat, which typically leads to the substitution of hydrogen atoms in alkanes with chlorine atoms.
Analyze the structure of the alkane: The given alkane is 2-methylbutane, which has primary, secondary, and tertiary hydrogen atoms available for substitution.
Determine the reactivity of hydrogen atoms: In free radical halogenation, tertiary hydrogens are the most reactive, followed by secondary, and then primary hydrogens. This is due to the stability of the resulting free radicals.
Predict the major products: The reaction will likely produce three different chlorinated products based on the substitution at different hydrogen sites. Consider the formation of products from the substitution at tertiary, secondary, and primary positions.
Consider the number of products: Since the problem specifies three products, focus on the most likely sites for chlorine substitution that would lead to distinct products, ignoring any racemic mixtures that might form.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alkane Halogenation
Alkane halogenation is a substitution reaction where an alkane reacts with a halogen (like Cl2 or Br2) to form alkyl halides. This process typically involves the generation of free radicals through the homolytic cleavage of the halogen bond, followed by a series of radical propagation steps that lead to the substitution of hydrogen atoms in the alkane with halogen atoms.
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Functionalizing Alkanes
Free Radical Mechanism
The free radical mechanism is a multi-step process that includes initiation, propagation, and termination steps. In the initiation step, halogen molecules dissociate into free radicals. During propagation, these radicals react with alkanes to form new radicals and alkyl halides. The process continues until termination occurs, where two radicals combine to form a stable product, effectively ending 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 products are possible. In alkane halogenation, the formation of products is influenced by the stability of the resulting radicals; more stable tertiary radicals are favored over primary ones, leading to a higher yield of products derived from more substituted carbon centers.
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Related Practice
Textbook Question
Can you make a 1° bromoalkane like (3-bromopropyl)cyclopentane using alkane halogenation? Why or why not?
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Textbook Question
Why is a 2° carbon radical more stable than a 1° carbon radical?
Textbook Question
Predict the major products of the following alkane halogenation reactions. [The number of products shown ignores the formation of racemic mixtures.]
(d)
1
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Textbook Question
When (1R,3S)-1-tert-butyl-1,3-dimethylcyclopentane is halogenated, one stereoisomer is produced in excess.
(b) explain why this reaction did not produce an equal mixture of stereoisomers.
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Textbook Question
Suppose a 2-halobutane was needed for a synthetic sequence. Starting your synthesis with butane, would it be best to put a chlorine or bromine at that position? Explain.
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