Textbook Question
Predict the major products of the following alkane halogenation reactions. [The number of products shown ignores the formation of racemic mixtures.]
(c)
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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 22b
Mullins 1st EditionCh. 11 - Properties and Synthesis of Alkyl Halides: Radical ReactionsProblem 22bChapter 10, Problem 22b
Predict the major products of the following alkane halogenation reactions. [The number of products shown ignores the formation of racemic mixtures.]
(b) 
Verified step by step guidance1
Identify the type of halogenation reaction: In alkane halogenation, a hydrogen atom in an alkane is replaced by a halogen atom, typically through a radical chain mechanism. The most common halogens used are chlorine (Cl2) and bromine (Br2).
Determine the type of alkane: Consider whether the alkane is linear, branched, or cyclic, as this will affect the stability of the intermediates and the regioselectivity of the reaction.
Consider the reactivity of the halogen: Chlorination is less selective and can lead to multiple products, while bromination is more selective and typically results in the formation of the most stable radical intermediate.
Identify the most stable radical intermediate: In bromination, the major product is usually formed via the most stable radical intermediate, which is often the tertiary radical due to its greater stability compared to secondary or primary radicals.
Predict the major product: Based on the stability of the radical intermediates, predict the major product of the halogenation reaction. For example, in bromination, the major product will be the one where the bromine atom is attached to the carbon that forms the most stable radical.
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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 reaction where a halogen, such as chlorine or bromine, is introduced to an alkane, resulting in the substitution of a hydrogen atom with a halogen atom. This reaction typically proceeds via a radical mechanism, initiated by heat or light, and involves the formation of reactive intermediates called free radicals.
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Functionalizing Alkanes
Radical Mechanism
The radical mechanism in alkane halogenation involves three main steps: initiation, propagation, and termination. Initiation generates radicals, usually by homolytic cleavage of the halogen molecule. Propagation involves the reaction of radicals with alkanes to form new radicals, while termination occurs when radicals combine to form stable products, ending the chain reaction.
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Regioselectivity in Halogenation
Regioselectivity refers to the preference for the formation of one constitutional isomer over others in a chemical reaction. In alkane halogenation, the major product is often determined by the stability of the intermediate radicals, with tertiary radicals being more stable than secondary, which are more stable than primary. This stability influences the site of halogen substitution, favoring more substituted carbon atoms.
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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
Predict the major products of the following alkane halogenation reactions. [The number of products shown ignores the formation of racemic mixtures.]
(d)
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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
When (1R,3S)-1-tert-butyl-1,3-dimethylcyclopentane is halogenated, one stereoisomer is produced in excess.
(a) Predict the identity of the major stereoisomer
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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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