Domanda del libro di testo
Show how the following compounds can be prepared from benzene:
c.
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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 94
Bruice 8th EditionCh. 18 - Reactions of Benzene and Substituted BenzenesProblema 94Capitolo 18, Problema 94
Propose a mechanism for the following reaction that explains why the configuration of the asymmetric center in the reactant is retained in the product:
Guida verificata passo dopo passo1
Step 1: Recognize that the reaction involves the conversion of an amino acid to a cyclic compound. The key reagent, NaNO₂ in HCl, is used to generate nitrous acid (HNO₂), which reacts with the amino group to form a diazonium salt.
Step 2: The amino group (-NH₂) of the reactant undergoes diazotization. In acidic conditions, nitrous acid reacts with the amino group to form a diazonium ion (-N₂⁺). This step is crucial for the subsequent transformation.
Step 3: The diazonium ion undergoes intramolecular cyclization. The carboxylate group (-COO⁻) acts as a nucleophile and attacks the carbon adjacent to the diazonium group, leading to the formation of a cyclic intermediate.
Step 4: During the cyclization, the stereochemistry of the asymmetric center is retained because the reaction proceeds through a concerted mechanism that does not involve inversion of configuration. The nucleophilic attack occurs in a way that preserves the spatial arrangement of the substituents.
Step 5: The cyclic intermediate undergoes rearrangement and stabilization to form the final product, a cyclic compound with a retained stereochemistry at the asymmetric center. The product is stabilized by resonance and the formation of a keto group.
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SN2 Reaction Mechanism
The SN2 (substitution nucleophilic bimolecular) mechanism involves a single concerted step where the nucleophile attacks the electrophile, leading to the displacement of a leaving group. This mechanism is characterized by a backside attack, which results in the inversion of configuration at the chiral center. In this case, the retention of configuration suggests that the reaction does not proceed via an SN2 pathway.
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Drawing the SN2 Mechanism
Asymmetric Centers
An asymmetric center, or chiral center, is a carbon atom bonded to four different substituents, leading to non-superimposable mirror images known as enantiomers. The configuration of these centers is crucial in determining the stereochemistry of the product. Understanding how reactions affect these centers is essential for predicting the stereochemical outcome of organic reactions.
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Diazotization Reaction
Diazotization is a reaction where an amine is converted into a diazonium salt using nitrous acid (NaNO2 in HCl). This process is significant in organic synthesis as it allows for the introduction of various functional groups through subsequent reactions. In the context of the question, the mechanism of diazotization helps explain how the configuration at the asymmetric center is retained in the product.
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