Textbook Question
Draw the mechanism if it involves general-acid catalysis.
937
views
Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
Not the one you use?Change textbookSelect a different textbook
Table of contents
- 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
All textbooks
Bruice 8th EditionCh. 22 - Catalysis in Organic Reactions and in Enzymatic ReactionsProblem 2(4)
Bruice 8th EditionCh. 22 - Catalysis in Organic Reactions and in Enzymatic ReactionsProblem 2(4)Chapter 22, Problem 2(4)
Compare each of the mechanisms listed here with the mechanism for each of the two parts of the acid-catalyzed hydrolysis of an ester, indicating a. similarities. b. differences.
4. acid-catalyzed hydrolysis of an amide
Verified step by step guidance1
Step 1: Understand the acid-catalyzed hydrolysis of an ester. This reaction involves two main parts: (1) protonation of the ester carbonyl group to make it more electrophilic, followed by nucleophilic attack by water, and (2) subsequent steps leading to the formation of a carboxylic acid and an alcohol.
Step 2: Review the acid-catalyzed hydrolysis of an amide (Section 15.12). This reaction also involves protonation of the carbonyl group to increase its electrophilicity, followed by nucleophilic attack by water. The reaction proceeds through a tetrahedral intermediate and ultimately forms a carboxylic acid and an amine or ammonia.
Step 3: Compare the similarities between the two mechanisms. Both reactions are acid-catalyzed and involve protonation of the carbonyl group to enhance electrophilicity. Both proceed through a tetrahedral intermediate and result in the cleavage of the C-N or C-O bond to form a carboxylic acid.
Step 4: Identify the differences between the two mechanisms. In ester hydrolysis, the leaving group is an alcohol, whereas in amide hydrolysis, the leaving group is an amine or ammonia. Additionally, amides are generally less reactive than esters due to resonance stabilization of the amide bond, so harsher conditions (e.g., higher temperature or stronger acid) may be required for amide hydrolysis.
Step 5: Summarize the key points. Both mechanisms share a similar overall pathway but differ in the nature of the leaving group and the reactivity of the starting material. These differences are due to the electronic properties of esters and amides.
Verified video answer for a similar problem:
This video solution was recommended by our tutors as helpful for the problem above.
Video duration:
3mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acid-Catalyzed Hydrolysis
Acid-catalyzed hydrolysis is a reaction where an ester or amide is converted into its corresponding acid and alcohol or amine in the presence of an acid catalyst. The acid donates protons to facilitate the breaking of the carbon-oxygen or carbon-nitrogen bond, enhancing the nucleophilicity of water. This mechanism typically involves the formation of a tetrahedral intermediate, which is a key feature in both ester and amide hydrolysis.
Recommended video:
03:09
Acid Catalyzed
Mechanism Comparison
Comparing mechanisms involves analyzing the steps and intermediates involved in each reaction pathway. In the case of acid-catalyzed hydrolysis of esters and amides, one must consider the role of the nucleophile (water) and the nature of the leaving group. While both mechanisms share similarities in protonation and nucleophilic attack, differences arise in the stability of intermediates and the nature of the products formed.
Recommended video:
03:32How do we predict if the mechanism is SN1 or SN2?
Tetrahedral Intermediates
Tetrahedral intermediates are crucial in the hydrolysis of esters and amides, formed when the nucleophile attacks the carbonyl carbon. In ester hydrolysis, this intermediate leads to the formation of an alcohol and a carboxylic acid, while in amide hydrolysis, it results in an amine and a carboxylic acid. Understanding the formation and stability of these intermediates helps in distinguishing the mechanisms and predicting the reaction outcomes.
Recommended video:
04:31Stability of Conjugated Intermediates
Related Practice
Textbook Question
Draw the mechanism for the following reaction if it involves specific-acid catalysis.
1054
views
Textbook Question
Compare each of the mechanisms listed here with the mechanism for each of the two parts of the acid-catalyzed hydrolysis of an ester, indicating a. similarities. b. differences.
1. acid-catalyzed formation of a hydrate
811
views