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Identify A–J:
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Ch. 18 - Reactions of Benzene and Substituted Benzenes
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- 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
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Bruice 8th EditionCh. 18 - Reactions of Benzene and Substituted BenzenesProblema 85b
Bruice 8th EditionCh. 18 - Reactions of Benzene and Substituted BenzenesProblema 85bCapitolo 18, Problema 85b
Identify A–J:
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Step 1: Analyze the first reaction. The starting compound is isopropylbenzene (cumene). It reacts with bromine (Br₂) under UV light (hν), which indicates a free radical halogenation reaction. The bromine will selectively replace a hydrogen atom at the benzylic position (the carbon adjacent to the benzene ring) due to the stability of the benzylic radical.
Step 2: The product of the first reaction (A) is a benzylic bromide. In the second step, this benzylic bromide reacts with tert-butoxide (tert-BuO⁻), a strong base. This is an elimination reaction (E2 mechanism), where the bromine is eliminated along with a proton from the adjacent carbon, forming a double bond. The product (B) is an alkene at the benzylic position.
Step 3: The third reaction involves the addition of hydrogen iodide (HI) to the alkene (B) under heat (Δ). This is an electrophilic addition reaction. HI adds across the double bond, following Markovnikov's rule, where the iodine attaches to the benzylic carbon and the hydrogen attaches to the less substituted carbon.
Step 4: The final product (C) is a benzylic iodide. This compound is formed as a result of the addition of HI to the alkene.
Step 5: To summarize, the sequence of reactions involves free radical halogenation, elimination, and electrophilic addition. Each step transforms the functional group at the benzylic position, leading to the final product.
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Radical Reactions
Radical reactions involve the formation and reaction of radicals, which are species with unpaired electrons. These reactions often require initiation steps, such as exposure to light (hv) or heat, to generate radicals from stable molecules. In this context, bromine (Br2) is used to generate a radical intermediate (A) through homolytic cleavage.
Video consigliato:
03:49
What are Radical Initiators?
Nucleophilic Substitution
Nucleophilic substitution is a fundamental reaction in organic chemistry where a nucleophile replaces a leaving group in a molecule. In the reaction sequence, the tert-butoxide ion (tert-BuO-) acts as a nucleophile, attacking the radical intermediate (A) to form compound B. This step is crucial for the transformation of radicals into more stable products.
Video consigliato:
01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Elimination Reactions
Elimination reactions involve the removal of atoms or groups from a molecule, resulting in the formation of a double bond or a ring structure. In this case, the reaction of compound B with hydrogen iodide (HI) under heat (Δ) leads to the elimination of a leaving group and the formation of compound C. Understanding elimination mechanisms is essential for predicting product formation in organic synthesis.
Video consigliato:
00:40Recognizing Elimination Reactions.
Pratica correlata
Domanda del libro di testo
The pKa values of a few ortho-, meta-, and para-substituted benzoic acids are shown below:
The relative pKa values depend on the substituent. For chloro-substituted benzoic acids, the ortho isomer is the most acidic and the para isomer is the least acidic; for nitro-substituted benzoic acids, the ortho isomer is the most acidic and the meta isomer is the least acidic; and for amino-substituted benzoic acids, the meta isomer is the most acidic and the ortho isomer is the least acidic. Explain these relative acidities.
c. NH2: meta > para > ortho
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Domanda del libro di testo
What reagents are required to carry out the following synthesis?
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Domanda del libro di testo
Identify A–J:
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Domanda del libro di testo
The pKa values of a few ortho-, meta-, and para-substituted benzoic acids are shown below:
The relative pKa values depend on the substituent. For chloro-substituted benzoic acids, the ortho isomer is the most acidic and the para isomer is the least acidic; for nitro-substituted benzoic acids, the ortho isomer is the most acidic and the meta isomer is the least acidic; and for amino-substituted benzoic acids, the meta isomer is the most acidic and the ortho isomer is the least acidic.
Explain these relative acidities.
a. Cl: ortho > meta > para
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Domanda del libro di testo
What reagents are required to carry out the following synthesis?
1069
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