Textbook Question
Starting with methyl acetate, what neutral nucleophile would you use to synthesize each of the following compounds? b. acetamide
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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 13b
Bruice 8th EditionCh. 15 - Reactions of Carboxylic Acids and Carboxylic Acid DerivativesProblem 13bChapter 16, Problem 13b
Write the mechanism for each of the following reactions:
b. the reaction of benzoyl chloride with excess methylamine to form N-methylbenzamide
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Identify the functional groups involved in the reaction. Benzoyl chloride contains an acyl chloride group (-COCl), which is highly reactive, and methylamine (CH₃NH₂) is a nucleophile due to the lone pair of electrons on the nitrogen atom.
Recognize the type of reaction. This is a nucleophilic acyl substitution reaction, where the nucleophile (methylamine) attacks the electrophilic carbonyl carbon of benzoyl chloride, leading to the substitution of the chloride group.
Step 1: The lone pair of electrons on the nitrogen atom of methylamine attacks the carbonyl carbon of benzoyl chloride. This forms a tetrahedral intermediate, where the carbonyl oxygen temporarily gains a negative charge.
Step 2: The tetrahedral intermediate collapses, reforming the carbonyl group. This results in the expulsion of the chloride ion (Cl⁻) as a leaving group, forming an amide bond between the benzoyl group and the methylamine.
Step 3: Since excess methylamine is present, it can act as a base to neutralize the H⁺ released during the reaction, forming N-methylbenzamide as the final product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilic Acyl Substitution
Nucleophilic acyl substitution is a fundamental reaction in organic chemistry where a nucleophile attacks the electrophilic carbon of a carbonyl group, leading to the substitution of a leaving group. In the case of benzoyl chloride, the chlorine atom is the leaving group, and methylamine acts as the nucleophile. This mechanism is crucial for understanding how amides are formed from acyl chlorides.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
Amine Reactivity
Amines are nucleophilic compounds that can react with electrophiles due to the presence of a lone pair of electrons on the nitrogen atom. In this reaction, excess methylamine not only attacks the carbonyl carbon of benzoyl chloride but can also lead to the formation of N-methylbenzamide. Understanding the reactivity of amines is essential for predicting the outcome of reactions involving these compounds.
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Formation of Amides
Amides are organic compounds characterized by the presence of a carbonyl group (C=O) directly bonded to a nitrogen atom. The formation of amides from acyl chlorides, such as benzoyl chloride, involves the nucleophilic attack of an amine, resulting in the formation of a stable amide bond. This concept is vital for grasping the significance of amide formation in organic synthesis and its applications in pharmaceuticals.
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Related Practice
Textbook Question
Write a mechanism for each of the following reactions:
a. the uncatalyzed hydrolysis of methyl propionate.
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Textbook Question
Starting with methyl acetate, what neutral nucleophile would you use to synthesize each of the following compounds? a. ethyl acetate
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Textbook Question
Starting with acetyl chloride, what neutral nucleophile would you use to synthesize each of the following compounds?
e.
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Textbook Question
Write the mechanism for each of the following reactions:
a. the reaction of acetyl chloride with water to form acetic acid
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Textbook Question
Starting with acetyl chloride, what neutral nucleophile would you use to synthesize each of the following compounds?
f.
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