Textbook Question
Propose products (if any) and mechanisms for the following AlCl3-catalyzed reactions:
c. 3-chloro-2,2-dimethylbutane with isopropylbenzene
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Ch. 17 - Reactions of Aromatic Compounds
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 17, Problem 16d
For each reaction, show the generation of the electrophile and predict the products.
d. propan-2-ol + toluene + BF3
Verified step by step guidance1
Step 1: Understand the role of BF₃ in the reaction. Boron trifluoride (BF₃) is a Lewis acid, meaning it can accept electron pairs. In this reaction, BF₃ will likely interact with propan-2-ol to generate an electrophile.
Step 2: Analyze the interaction between BF₃ and propan-2-ol. Propan-2-ol contains a hydroxyl (-OH) group, which has lone pairs of electrons. BF₃ can coordinate with these lone pairs, leading to the formation of a complex that enhances the electrophilic character of the carbon atom attached to the hydroxyl group.
Step 3: Consider the role of toluene in the reaction. Toluene is an aromatic compound with a methyl group attached to a benzene ring. The aromatic ring can act as a nucleophile due to its π-electrons, which can interact with the electrophile generated in Step 2.
Step 4: Predict the product formation. The electrophile generated from propan-2-ol and BF₃ will likely undergo an electrophilic aromatic substitution reaction with toluene. This involves the aromatic ring attacking the electrophile, followed by the restoration of aromaticity.
Step 5: Summarize the reaction mechanism. The reaction proceeds as follows: (1) BF₃ interacts with propan-2-ol to generate an electrophile, (2) the electrophile reacts with the aromatic ring of toluene, and (3) a substituted aromatic product is formed, with the electrophile replacing a hydrogen atom 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.
Electrophiles
Electrophiles are species that accept electron pairs from nucleophiles during chemical reactions. They are typically positively charged or neutral molecules with an electron-deficient atom, making them reactive towards nucleophiles. In the given reaction, BF3 acts as a Lewis acid, generating an electrophile that can react with the nucleophilic propan-2-ol.
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03:
Nucleophile or Electrophile
Lewis Acids and Bases
Lewis acids are substances that can accept an electron pair, while Lewis bases donate an electron pair. In this reaction, BF3, a Lewis acid, interacts with propan-2-ol, a Lewis base, to form a complex. This interaction is crucial for understanding how the electrophile is generated and how the reaction proceeds.
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02:49The Lewis definition of acids and bases.
Electrophilic Substitution Reactions
Electrophilic substitution reactions involve the replacement of a hydrogen atom in an aromatic compound with an electrophile. In this case, toluene undergoes electrophilic substitution after the generation of the electrophile from the interaction of propan-2-ol and BF3. Understanding this mechanism is essential for predicting the products of the reaction.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Related Practice
Textbook Question
Show how you would use the Friedel–Crafts acylation, Clemmensen reduction, and/or Gatterman–Koch synthesis to prepare the following compounds:
e. 3-methyl-1-phenylbutane
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Textbook Question
For each reaction, show the generation of the electrophile and predict the products.
c. tert-butylbenzene + 2-methylpropene + HF
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Textbook Question
Predict the products (if any) of the following reactions.
a. (excess) benzene + isobutyl chloride + AlCl3
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Textbook Question
Propose products (if any) and mechanisms for the following AlCl3-catalyzed reactions:
b. methyl chloride with anisole
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Textbook Question
Predict the products (if any) of the following reactions.
b. (excess) toluene + butan-1-ol + BF3
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