Textbook Question
What reagent should be used to carry out the following reaction?
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Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- 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 DerivativesProblem 8a
Bruice 8th EditionCh. 15 - Reactions of Carboxylic Acids and Carboxylic Acid DerivativesProblem 8aChapter 16, Problem 8a
What is the product of an acyl substitution reaction—a new carboxylic acid derivative, a mixture of two carboxylic acid derivatives, or no reaction—if the new group in the tetrahedral intermediate is the following? a. a stronger base than the substituent that is attached to the acyl group
Verified step by step guidance1
Identify the type of reaction: This is an acyl substitution reaction, which involves the replacement of the leaving group attached to the acyl carbon with a nucleophile. The reaction proceeds through a tetrahedral intermediate.
Compare the basicity of the incoming group (nucleophile) and the leaving group: The outcome of the reaction depends on the relative basicity of the new group (nucleophile) and the substituent already attached to the acyl group (leaving group).
Understand the role of basicity: In acyl substitution reactions, the leaving group is typically the weaker base. If the new group (nucleophile) is a stronger base than the leaving group, it is less likely to leave the tetrahedral intermediate, favoring substitution.
Predict the product: Since the new group is a stronger base than the substituent attached to the acyl group, the reaction will result in the formation of a new carboxylic acid derivative where the stronger base replaces the weaker base as the substituent.
Conclude the reaction outcome: The product of the reaction will be a single new carboxylic acid derivative, as the stronger base remains attached to the acyl group after the substitution reaction.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Acyl Substitution Reaction
An acyl substitution reaction involves the replacement of a leaving group in an acyl compound (like an acyl chloride or an ester) with a new nucleophile. This process typically occurs through the formation of a tetrahedral intermediate, where the nucleophile attacks the carbonyl carbon, leading to the eventual expulsion of the leaving group and the formation of a new acyl derivative.
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Reactions of Amino Acids: Acylation Example 1
Tetrahedral Intermediate
In acyl substitution reactions, the tetrahedral intermediate is a crucial transient species formed when a nucleophile attacks the carbonyl carbon of the acyl compound. This intermediate is characterized by a tetrahedral geometry around the carbon, and its stability is influenced by the nature of the nucleophile and the leaving group. The fate of this intermediate determines whether a new product is formed or if the reaction reverts to the starting materials.
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Nucleophilicity and Leaving Group Ability
The outcome of an acyl substitution reaction is significantly affected by the relative strengths of the nucleophile and the leaving group. If the new nucleophile is a stronger base than the existing substituent, it can effectively displace the leaving group, leading to the formation of a new carboxylic acid derivative. Conversely, if the nucleophile is weaker, the reaction may not proceed, resulting in no reaction or the retention of the original acyl compound.
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07:22The 3 important leaving groups to know.
Related Practice
Textbook Question
b. What is the product of the reaction of acetamide with HO−? The pKa of NH3 is 36; the pKa of H2O is 15.7.
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Textbook Question
Using the pKa values listed in [TABLE 15.1], predict the products of the following reactions:
d.
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Textbook Question
What is the product of an acyl substitution reaction—a new carboxylic acid derivative, a mixture of two carboxylic acid derivatives, or no reaction—if the new group in the tetrahedral intermediate is the following? b. a weaker base than the substituent that is attached to the acyl group
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Textbook Question
Using the pKa values listed in [TABLE 15.1], predict the products of the following reactions:
c.
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Textbook Question
Which is a correct statement?
A. The delocalization energy of an ester is about 18 kcal/mol, and the delocalization energy of an amide is about 10 kcal/mol.
B. The delocalization energy of an ester is about 10 kcal/mol, and the delocalization energy of an amide is about 18 kcal/mol.
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