Textbook Question
How could you convert N-methylbenzamide to the following compounds?
b. benzoic acid
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Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of 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. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblem 73c,d
Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblem 73c,dChapter 17, Problem 73c,d
What are the products of the following reactions? Show all stereoisomers that are formed.
c. 
d. 
Verified step by step guidance1
Step 1: Analyze the reactants and reagents. The starting material is a ketone (2-pentanone) with a methyl group and an ethyl group attached to the carbonyl carbon. The reagent is dimethylamine (CH3)2NH in the presence of HCl.
Step 2: Recognize the type of reaction. This is an imine formation reaction, where the ketone reacts with a primary or secondary amine under acidic conditions to form an imine (Schiff base).
Step 3: Understand the mechanism. The reaction proceeds through nucleophilic attack of the amine on the carbonyl carbon, followed by proton transfers and dehydration to form the imine. The lone pair on the nitrogen of dimethylamine attacks the electrophilic carbonyl carbon, forming a tetrahedral intermediate.
Step 4: Consider stereoisomer formation. Since the starting ketone is achiral and the reaction does not introduce any new stereocenters, no stereoisomers are formed in this case. The product will be a single imine structure.
Step 5: Write the product structure. The imine product will have the nitrogen double-bonded to the carbon that was originally part of the carbonyl group, with the dimethyl groups attached to the nitrogen. The ethyl and methyl groups remain attached to the carbonyl carbon.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Imine Formation
Imine formation is a reaction between an aldehyde or ketone and a primary amine, resulting in the creation of an imine. This process typically involves the nucleophilic attack of the amine on the carbonyl carbon, followed by the elimination of water. The reaction is often catalyzed by acids, such as HCl, which protonate the carbonyl oxygen, enhancing the electrophilicity of the carbonyl carbon.
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Imine Mechanism
Stereoisomerism
Stereoisomerism refers to the phenomenon where compounds have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of their atoms. In the context of imine formation, stereoisomers can arise due to the presence of chiral centers in the reactants or products, leading to different configurations (e.g., E/Z or R/S isomers) that must be represented when showing all possible products.
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Catalysis in Organic Reactions
Catalysis involves the acceleration of a chemical reaction by a substance called a catalyst, which is not consumed in the reaction. In the formation of imines, HCl acts as a catalyst by facilitating the protonation of the carbonyl oxygen, making the carbonyl carbon more susceptible to nucleophilic attack by the amine. Understanding the role of catalysts is crucial for predicting reaction pathways and product distributions.
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Related Practice
Textbook Question
List three different sets of reagents (each set consisting of a carbonyl compound and a Grignard reagent) that could be used to prepare each of the following tertiary alcohols:
b.
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Textbook Question
What product is formed when 3-methyl-2-cyclohexenone reacts with each of the following reagents?
a. CH3MgBr followed by H3O+
b. (CH3CH2)2CuLi followed by H3O+
896
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Textbook Question
How could you convert N-methylbenzamide to the following compounds?
d. benzyl alcohol
735
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Textbook Question
List three different sets of reagents (each set consisting of a carbonyl compound and a Grignard reagent) that could be used to prepare each of the following tertiary alcohols:
a.
1213
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Textbook Question
How could you convert N-methylbenzamide to the following compounds?
c. methyl benzoate
959
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