Textbook Question
The zwitterionic form of carbonyls is often used to explain their electrophilicity. Draw the zwitterionic structure of NO+2. Why is this such a great electrophile at the central nitrogen?
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Ch. 23 - Benzene I: Aromatic Stability and Substitution 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. 23 - Benzene I: Aromatic Stability and Substitution ReactionsProblem 32d
Mullins 1st EditionCh. 23 - Benzene I: Aromatic Stability and Substitution ReactionsProblem 32dChapter 22, Problem 32d
Predict the product of the following Friedel–Crafts alkylation reactions. Assume only one alkyl group adds in each case.
(d) 
Verified step by step guidance1
Identify the reactants: The reaction involves benzene and chlorocyclopentane in the presence of aluminum chloride (AlCl₃) as a catalyst.
Understand the mechanism: Friedel-Crafts alkylation involves the formation of a carbocation intermediate. The chlorine atom in chlorocyclopentane will leave, forming a cyclopentyl carbocation.
Consider carbocation stability: The cyclopentyl carbocation is relatively stable and will act as the electrophile in the reaction.
Electrophilic aromatic substitution: The cyclopentyl carbocation will attack the benzene ring, forming a sigma complex (arenium ion) and eventually leading to the substitution of a hydrogen atom on the benzene ring with the cyclopentyl group.
Predict the product: The final product will be cyclopentylbenzene, where the cyclopentyl group is attached to the benzene ring.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Friedel-Crafts Alkylation
Friedel-Crafts alkylation is a reaction that introduces an alkyl group into an aromatic ring using an alkyl halide and a Lewis acid catalyst, typically aluminum chloride (AlCl3). This electrophilic substitution reaction allows for the formation of new carbon-carbon bonds, enhancing the complexity of aromatic compounds. However, it can lead to polysubstitution and rearrangements, so careful control of conditions is necessary.
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Friedel-Crafts Alkylation
Electrophilic Aromatic Substitution
Electrophilic aromatic substitution (EAS) is a fundamental reaction mechanism in organic chemistry where an electrophile replaces a hydrogen atom on an aromatic ring. The aromatic system's electron-rich nature makes it susceptible to attack by electrophiles, leading to the formation of a sigma complex. This mechanism is crucial for understanding how substituents affect the reactivity and orientation of further substitutions on the aromatic ring.
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Rearrangement of Carbocations
In Friedel-Crafts reactions, the formation of carbocations is a key step, and these intermediates can undergo rearrangement to form more stable structures. For instance, if a secondary or tertiary carbocation is formed, it may rearrange to a more stable tertiary carbocation before reacting with the aromatic ring. Understanding carbocation stability and rearrangement is essential for predicting the products of alkylation reactions.
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Related Practice
Textbook Question
With a small electron-donating group on the ring, it is possible to get as much as a 2:1 ratio of ortho to para. Why might this be?
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Textbook Question
Predict the product of the following Friedel–Crafts acylation reactions.
(b)
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Textbook Question
In Section 23.7.4, we learned that Friedel–Crafts alkylation suffers from overalkylation.
(a) Draw the product of a Friedel–Crafts reaction that resulted in three methyl groups adding to the ring.
(b) Why is hard to stop at the addition of one alkyl group?
Textbook Question
Classify the following conjugated systems as having 4n or 4n + 2 π electrons.
(f)
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Textbook Question
Convert the given name into the corresponding IUPAC name.
(b)
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