Textbook Question
Rank each group of compounds from most reactive to least reactive toward electrophilic aromatic substitution:
a. benzene, ethylbenzene, chlorobenzene, nitrobenzene, anisole
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Ch. 18 - Reactions of Benzene and Substituted Benzenes
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
Chapter 19, Problem 52b
Show how the following compounds can be synthesized from benzene:
b. m-chloroethylbenzene
Verified step by step guidance1
Step 1: Begin with benzene as the starting material. Benzene is an aromatic compound with alternating double bonds in a six-membered ring.
Step 2: Perform a Friedel-Crafts alkylation reaction to introduce the ethyl group onto the benzene ring. Use ethyl chloride (C₂H₅Cl) and a Lewis acid catalyst such as AlCl₃. This reaction will yield ethylbenzene.
Step 3: Carry out a chlorination reaction to introduce a chlorine atom onto the benzene ring. Use Cl₂ and a catalyst such as FeCl₃. This reaction will produce a mixture of ortho-, meta-, and para-chloroethylbenzene.
Step 4: Separate the meta-chloroethylbenzene from the mixture using techniques such as fractional distillation or chromatography, as the meta-isomer is the desired product.
Step 5: Confirm the structure of the synthesized m-chloroethylbenzene using spectroscopic methods such as NMR or IR to ensure the correct substitution pattern on the benzene ring.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Electrophilic Aromatic Substitution (EAS)
Electrophilic Aromatic Substitution is a fundamental reaction in organic chemistry where an electrophile replaces a hydrogen atom on an aromatic ring. This process is crucial for synthesizing various aromatic compounds, including m-chloroethylbenzene from benzene. The reaction typically involves the generation of a positively charged intermediate, which then loses a proton to restore aromaticity.
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EAS Review
Regioselectivity in Substitution Reactions
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others when multiple possibilities exist. In the case of m-chloroethylbenzene synthesis, understanding the directing effects of substituents on the benzene ring is essential. The presence of an ethyl group directs the incoming electrophile to the meta position relative to itself, leading to the desired product.
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01:34Recognizing Substitution Reactions.
Chlorination of Aromatic Compounds
Chlorination is a specific type of electrophilic aromatic substitution where chlorine is introduced into an aromatic compound. This reaction often requires a catalyst, such as iron(III) chloride, to generate the electrophilic chlorine species. In the synthesis of m-chloroethylbenzene, chlorination occurs after the ethyl group has been introduced, allowing for the selective formation of the meta product.
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Related Practice
Textbook Question
Show how the following compounds can be synthesized from benzene:
f. m-hydroxybenzoic acid
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Textbook Question
Rank each group of compounds from most reactive to least reactive toward electrophilic aromatic substitution:
b. 1-chloro-2,4-dinitrobenzene, 2,4-dinitrophenol, 1-methyl-2,4-dinitrobenzene
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Textbook Question
For each horizontal row of substituted benzenes, indicate
c. the one that yields the highest percentage of meta product in an electrophilic aromatic substitution reaction.
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2.
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Textbook Question
For each horizontal row of substituted benzenes, indicate
c. the one that yields the highest percentage of meta product in an electrophilic aromatic substitution reaction.
3.
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Textbook Question
For each horizontal row of substituted benzenes, indicate
c. the one that yields the highest percentage of meta product in an electrophilic aromatic substitution reaction.
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