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Benzene Electrophilic Substitution & Phenol Reactions - Simple Steps & Diagrams

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J

Josh

22/11/2022

Chemistry

Aromatic Chemistry Chapter 25 OCR

Benzene Electrophilic Substitution & Phenol Reactions - Simple Steps & Diagrams

The document provides a comprehensive overview of benzene, its structure, reactivity, and related compounds like phenols. It covers the benzene electrophilic substitution mechanism steps, including nitration, halogenation, and Friedel-Crafts reactions. The text also explores the acidity and reactivity of phenol, comparing it to benzene and discussing its electrophilic substitutions.

  • Benzene's unique structure and stability are explained through Kekulé's model and experimental evidence.
  • Electrophilic substitution reactions of benzene, including nitration and halogenation, are detailed with mechanisms.
  • Friedel-Crafts alkylation and acylation reactions are described step-by-step.
  • The reactivity of benzene is compared to alkenes, highlighting the differences in their electron distribution.
  • Phenol's properties, including its acidity and enhanced reactivity in electrophilic substitutions, are discussed.
...

22/11/2022

555

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Benzene Structure and Stability

This page delves into the unique structure of benzene, explaining why it differs from what one might expect based on its molecular formula.

The stability of benzene is discussed through three key points:

  1. Lack of reactivity: Benzene does not undergo typical alkene reactions like decolorizing bromine water, indicating its unique structure.
  2. Intermediate bond lengths: X-ray diffraction studies show that all bonds in benzene are of equal length, falling between single and double bond lengths.
  3. Hydrogenation enthalpies: The actual hydrogenation enthalpy of benzene is 152 kJ/mol less than expected, demonstrating its enhanced stability.

Vocabulary: Kekulé's model refers to the cyclic structure of benzene proposed by August Kekulé, representing it as a six-membered ring with alternating single and double bonds.

Highlight: Benzene's stability is 152 kJ/mol greater than what would be expected for a cycloalkene structure, indicating its unique aromatic character.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Delocalized Structure of Benzene

This page explains the delocalized electronic structure of benzene, which is fundamental to understanding its stability and reactivity.

The formation of the delocalized structure is described as follows:

Each carbon atom in benzene uses three of its four electrons to form sigma bonds with two other carbons and one hydrogen. The remaining electron occupies a p-orbital perpendicular to the plane of the ring. These p-orbitals overlap above and below the ring plane, creating a region of electron density.

Definition: Delocalization refers to the spread of electron density over multiple atoms in a molecule, rather than being confined to specific bonds.

Highlight: The overlapping p-orbitals in benzene create a delocalized π-system that spreads over all six carbon atoms, contributing to its unique stability and reactivity.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Nitration of Benzene

This page details the benzene electrophilic substitution mechanism for nitration, a classic example of aromatic electrophilic substitution.

The nitration reaction occurs under the following conditions:

  • Temperature: 50°C
  • Catalyst: Concentrated H₂SO₄

The mechanism proceeds in three steps:

  1. Formation of the electrophile NO2+NO₂⁺: HNO₃ + H₂SO₄ → H₂O + NO₂⁺ + HSO₄⁻
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton to restore aromaticity: H⁺ + HSO₄⁻ → H₂SO₄

Example: The nitration of benzene mechanism is a prime illustration of electrophilic aromatic substitution, where the nitro group NO2NO₂ replaces a hydrogen atom on the benzene ring.

Highlight: The use of concentrated sulfuric acid as a catalyst is crucial for generating the electrophilic nitronium ion NO2+NO₂⁺.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Halogenation of Benzene

This page discusses the halogenation of benzene, another important benzene electrophilic substitution mechanism.

The key points about benzene halogenation are:

  1. Benzene's stability makes it unreactive towards direct halogenation due to insufficient electron density to polarize a halogen molecule.
  2. A halogen carrier catalystcatalyst such as iron or ironIIIIII bromide is required for the reaction to proceed.

The mechanism involves three steps:

  1. Formation of the electrophile: Br₂ + FeBr₃ → FeBr₄⁻ + Br⁺
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton and regeneration of the catalyst: H⁺ + FeBr₄⁻ → FeBr₃ + HBr

Vocabulary: A halogen carrier is a Lewis acid catalyst that facilitates the formation of the electrophilic halogen species in aromatic halogenation reactions.

Highlight: The use of a halogen carrier distinguishes the halogenation of benzene from the halogenation of alkenes, which occurs readily without a catalyst.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Friedel-Crafts Alkylation and Acylation

This page covers the Friedel-Crafts alkylation and acylation steps, which are important carbon-carbon bond-forming reactions in aromatic chemistry.

Friedel-Crafts Alkylation:

  1. Formation of the carbocation electrophile: R-Cl + AlCl₃ → R⁺ + AlCl₄⁻
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton: H⁺ + AlCl₄⁻ → AlCl₃ + HCl

Friedel-Crafts Acylation:

  1. Formation of the acylium ion: RCOCl + AlCl₃ → RCO⁺ + AlCl₄⁻
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton: H⁺ + AlCl₄⁻ → AlCl₃ + HCl

Example: The Friedel-Crafts acylation of benzene using acetyl chloride CH3COClCH₃COCl and AlCl₃ produces acetophenone.

Highlight: Friedel-Crafts reactions are versatile methods for introducing alkyl or acyl groups onto aromatic rings, but they have limitations such as rearrangements in alkylations and the requirement for at least equimolar amounts of AlCl₃.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Comparing Reactivity of Alkenes and Arenes

This page provides a comparison between the reactivity of alkenes and arenes aromaticcompoundslikebenzenearomatic compounds like benzene, highlighting their differences in electronic structure and chemical behavior.

Key differences:

  1. Electron distribution: Alkenes have localized electrons in π-bonds, while arenes have delocalized electrons in a π-system.
  2. Reactivity towards electrophiles: Alkenes have sufficient electron density to polarize molecules like bromine, whereas arenes require a halogen carrier.
  3. Reaction types: Alkenes undergo electrophilic addition, while arenes undergo electrophilic substitution.

Definition: Arenes are aromatic hydrocarbons characterized by a planar ring structure with delocalized π-electrons, exemplified by benzene and its derivatives.

Highlight: The delocalized nature of electrons in arenes contributes to their stability and unique reactivity, distinguishing them from alkenes in electrophilic reactions.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Phenol: Properties and Reactions

This page introduces phenol, discussing its acidity and reactivity in electrophilic substitution reactions.

Key points about phenol:

  1. It is a weak acid, more acidic than alcohols.
  2. Phenol undergoes electrophilic substitution reactions more readily than benzene.

Bromination of phenol:

  • Reacts with bromine water without a catalyst
  • Produces 2,4,6-tribromophenol as a white precipitate

Example: The reaction of phenol with sodium hydroxide demonstrates its acidic nature, forming sodium phenoxide.

Highlight: Phenol's enhanced reactivity in electrophilic substitutions is due to the electron-donating effect of the -OH group, which increases electron density in the aromatic ring.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

View

Nitration of Phenol and Reactivity Comparison

This page covers the nitration of phenol and compares the reactivities of benzene and phenol.

Nitration of phenol:

  • Occurs with dilute nitric acid, unlike benzene which requires concentrated acid and a catalyst
  • Produces a mixture of 2-nitrophenol and 4-nitrophenol

Reactivity comparison:

  1. Benzene requires harsh conditions concentratedacids,catalystsconcentrated acids, catalysts for electrophilic substitution.
  2. Phenol reacts under milder conditions without catalysts.

Vocabulary: Ortho and para directors are substituents that direct incoming electrophiles to positions 2 and 4 on the benzene ring, respectively.

Highlight: The lone pair of electrons on the oxygen atom in phenol's -OH group is partially donated into the π-system, increasing the electron density and reactivity of the aromatic ring.

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Chemistry

555

22 Nov 2022

9 pages

Benzene Electrophilic Substitution & Phenol Reactions - Simple Steps & Diagrams

J

Josh

@josh_exkg

The document provides a comprehensive overview of benzene, its structure, reactivity, and related compounds like phenols. It covers the benzene electrophilic substitution mechanism steps, including nitration, halogenation, and Friedel-Crafts reactions. The text also explores the acidity and reactivity of... Show more

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

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Improve your grades

Join milions of students

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Benzene Structure and Stability

This page delves into the unique structure of benzene, explaining why it differs from what one might expect based on its molecular formula.

The stability of benzene is discussed through three key points:

  1. Lack of reactivity: Benzene does not undergo typical alkene reactions like decolorizing bromine water, indicating its unique structure.
  2. Intermediate bond lengths: X-ray diffraction studies show that all bonds in benzene are of equal length, falling between single and double bond lengths.
  3. Hydrogenation enthalpies: The actual hydrogenation enthalpy of benzene is 152 kJ/mol less than expected, demonstrating its enhanced stability.

Vocabulary: Kekulé's model refers to the cyclic structure of benzene proposed by August Kekulé, representing it as a six-membered ring with alternating single and double bonds.

Highlight: Benzene's stability is 152 kJ/mol greater than what would be expected for a cycloalkene structure, indicating its unique aromatic character.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Delocalized Structure of Benzene

This page explains the delocalized electronic structure of benzene, which is fundamental to understanding its stability and reactivity.

The formation of the delocalized structure is described as follows:

Each carbon atom in benzene uses three of its four electrons to form sigma bonds with two other carbons and one hydrogen. The remaining electron occupies a p-orbital perpendicular to the plane of the ring. These p-orbitals overlap above and below the ring plane, creating a region of electron density.

Definition: Delocalization refers to the spread of electron density over multiple atoms in a molecule, rather than being confined to specific bonds.

Highlight: The overlapping p-orbitals in benzene create a delocalized π-system that spreads over all six carbon atoms, contributing to its unique stability and reactivity.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Nitration of Benzene

This page details the benzene electrophilic substitution mechanism for nitration, a classic example of aromatic electrophilic substitution.

The nitration reaction occurs under the following conditions:

  • Temperature: 50°C
  • Catalyst: Concentrated H₂SO₄

The mechanism proceeds in three steps:

  1. Formation of the electrophile NO2+NO₂⁺: HNO₃ + H₂SO₄ → H₂O + NO₂⁺ + HSO₄⁻
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton to restore aromaticity: H⁺ + HSO₄⁻ → H₂SO₄

Example: The nitration of benzene mechanism is a prime illustration of electrophilic aromatic substitution, where the nitro group NO2NO₂ replaces a hydrogen atom on the benzene ring.

Highlight: The use of concentrated sulfuric acid as a catalyst is crucial for generating the electrophilic nitronium ion NO2+NO₂⁺.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Halogenation of Benzene

This page discusses the halogenation of benzene, another important benzene electrophilic substitution mechanism.

The key points about benzene halogenation are:

  1. Benzene's stability makes it unreactive towards direct halogenation due to insufficient electron density to polarize a halogen molecule.
  2. A halogen carrier catalystcatalyst such as iron or ironIIIIII bromide is required for the reaction to proceed.

The mechanism involves three steps:

  1. Formation of the electrophile: Br₂ + FeBr₃ → FeBr₄⁻ + Br⁺
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton and regeneration of the catalyst: H⁺ + FeBr₄⁻ → FeBr₃ + HBr

Vocabulary: A halogen carrier is a Lewis acid catalyst that facilitates the formation of the electrophilic halogen species in aromatic halogenation reactions.

Highlight: The use of a halogen carrier distinguishes the halogenation of benzene from the halogenation of alkenes, which occurs readily without a catalyst.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

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Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Friedel-Crafts Alkylation and Acylation

This page covers the Friedel-Crafts alkylation and acylation steps, which are important carbon-carbon bond-forming reactions in aromatic chemistry.

Friedel-Crafts Alkylation:

  1. Formation of the carbocation electrophile: R-Cl + AlCl₃ → R⁺ + AlCl₄⁻
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton: H⁺ + AlCl₄⁻ → AlCl₃ + HCl

Friedel-Crafts Acylation:

  1. Formation of the acylium ion: RCOCl + AlCl₃ → RCO⁺ + AlCl₄⁻
  2. Attack of the electrophile on the benzene ring
  3. Loss of a proton: H⁺ + AlCl₄⁻ → AlCl₃ + HCl

Example: The Friedel-Crafts acylation of benzene using acetyl chloride CH3COClCH₃COCl and AlCl₃ produces acetophenone.

Highlight: Friedel-Crafts reactions are versatile methods for introducing alkyl or acyl groups onto aromatic rings, but they have limitations such as rearrangements in alkylations and the requirement for at least equimolar amounts of AlCl₃.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Comparing Reactivity of Alkenes and Arenes

This page provides a comparison between the reactivity of alkenes and arenes aromaticcompoundslikebenzenearomatic compounds like benzene, highlighting their differences in electronic structure and chemical behavior.

Key differences:

  1. Electron distribution: Alkenes have localized electrons in π-bonds, while arenes have delocalized electrons in a π-system.
  2. Reactivity towards electrophiles: Alkenes have sufficient electron density to polarize molecules like bromine, whereas arenes require a halogen carrier.
  3. Reaction types: Alkenes undergo electrophilic addition, while arenes undergo electrophilic substitution.

Definition: Arenes are aromatic hydrocarbons characterized by a planar ring structure with delocalized π-electrons, exemplified by benzene and its derivatives.

Highlight: The delocalized nature of electrons in arenes contributes to their stability and unique reactivity, distinguishing them from alkenes in electrophilic reactions.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

Sign up to see the contentIt's free!

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Phenol: Properties and Reactions

This page introduces phenol, discussing its acidity and reactivity in electrophilic substitution reactions.

Key points about phenol:

  1. It is a weak acid, more acidic than alcohols.
  2. Phenol undergoes electrophilic substitution reactions more readily than benzene.

Bromination of phenol:

  • Reacts with bromine water without a catalyst
  • Produces 2,4,6-tribromophenol as a white precipitate

Example: The reaction of phenol with sodium hydroxide demonstrates its acidic nature, forming sodium phenoxide.

Highlight: Phenol's enhanced reactivity in electrophilic substitutions is due to the electron-donating effect of the -OH group, which increases electron density in the aromatic ring.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

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Nitration of Phenol and Reactivity Comparison

This page covers the nitration of phenol and compares the reactivities of benzene and phenol.

Nitration of phenol:

  • Occurs with dilute nitric acid, unlike benzene which requires concentrated acid and a catalyst
  • Produces a mixture of 2-nitrophenol and 4-nitrophenol

Reactivity comparison:

  1. Benzene requires harsh conditions concentratedacids,catalystsconcentrated acids, catalysts for electrophilic substitution.
  2. Phenol reacts under milder conditions without catalysts.

Vocabulary: Ortho and para directors are substituents that direct incoming electrophiles to positions 2 and 4 on the benzene ring, respectively.

Highlight: The lone pair of electrons on the oxygen atom in phenol's -OH group is partially donated into the π-system, increasing the electron density and reactivity of the aromatic ring.

Benzene I
phenols! 25.1
Benzene
kekule's model
:
2
cyclo-1,3,5- hexa triene.
1) Lack of reactivity of benzene.
If benzene had C=C double bon

Sign up to see the contentIt's free!

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Improve your grades

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Benzene and Phenols: Structure and Reactivity

This page introduces the topic of benzene and phenols, setting the stage for a detailed exploration of their chemical properties and reactions. The title suggests that the document will cover the structure, reactivity, and various aspects of these aromatic compounds.

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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.

Basil

Android user

This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.

David K

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The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!

Sudenaz Ocak

Android user

In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.

Greenlight Bonnie

Android user

very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.

Rohan U

Android user

I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.

Xander S

iOS user

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This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now

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