Domanda del libro di testo
b. Explain why the rate of aminolysis of an ester cannot be increased by H+.
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Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives
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. 15 - Reactions of Carboxylic Acids and Carboxylic Acid DerivativesProblema 25b
Bruice 8th EditionCh. 15 - Reactions of Carboxylic Acids and Carboxylic Acid DerivativesProblema 25bCapitolo 15, Problema 25b
What products are obtained from the following reactions? b. phenyl acetate + excess ethanol + HCl
Guida verificata passo dopo passo1
Step 1: Recognize the type of reaction. This is an acid-catalyzed esterification (Fischer esterification) or transesterification reaction, where phenyl acetate (an ester) reacts with excess ethanol in the presence of an acid catalyst (HCl).
Step 2: Understand the mechanism. In the presence of HCl, the carbonyl oxygen of the ester (phenyl acetate) gets protonated, making the carbonyl carbon more electrophilic and susceptible to nucleophilic attack by ethanol.
Step 3: Identify the nucleophile and electrophile. Ethanol acts as the nucleophile, attacking the electrophilic carbonyl carbon of phenyl acetate, leading to the formation of a tetrahedral intermediate.
Step 4: Follow the reaction pathway. The tetrahedral intermediate undergoes proton transfers and elimination of the leaving group (phenol, C6H5OH), resulting in the formation of a new ester, ethyl acetate (CH3COOCH2CH3).
Step 5: Summarize the products. The reaction produces ethyl acetate (the new ester) and phenol as the byproduct. The excess ethanol ensures the reaction proceeds to completion by shifting the equilibrium toward product formation.
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Ester Hydrolysis
Ester hydrolysis is a reaction where an ester reacts with water or an alcohol in the presence of an acid or base, leading to the formation of an alcohol and a carboxylic acid. In this case, phenyl acetate undergoes hydrolysis in the presence of excess ethanol and HCl, resulting in the formation of phenol and acetic acid.
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Fischer Esterification
Fischer esterification is a process where a carboxylic acid reacts with an alcohol to form an ester and water, typically catalyzed by an acid. In the context of the given reaction, the excess ethanol can also act as a reactant, potentially leading to the formation of ethyl acetate alongside the hydrolysis products.
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Role of Catalysts in Reactions
Catalysts, such as HCl in this reaction, are substances that increase the rate of a chemical reaction without being consumed in the process. In ester hydrolysis and Fischer esterification, HCl serves to protonate the carbonyl oxygen of the ester, making it more susceptible to nucleophilic attack by water or ethanol, thus facilitating the reaction.
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