Textbook Question
How could you convert N-methylbenzamide to the following compounds?
b. benzoic acid
1
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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 72d
Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblem 72dChapter 17, Problem 72d
How could you convert N-methylbenzamide to the following compounds?
d. benzyl alcohol
Verified step by step guidance1
Step 1: Begin by hydrolyzing N-methylbenzamide to benzoic acid. This can be achieved using acidic or basic hydrolysis conditions. For example, heating the compound with aqueous HCl or NaOH will break the amide bond, yielding benzoic acid and methylamine.
Step 2: Reduce the benzoic acid to benzyl alcohol. This can be done using a reducing agent such as lithium aluminum hydride (LiAlH4), which is highly effective for reducing carboxylic acids to primary alcohols.
Step 3: After the reduction, isolate and purify the benzyl alcohol product using techniques such as distillation or recrystallization, depending on the physical properties of the product.
Step 4: Confirm the structure of benzyl alcohol using spectroscopic methods such as NMR or IR. For example, the IR spectrum should show a broad O-H stretch around 3200-3600 cm⁻¹, and the NMR spectrum should display signals corresponding to the benzyl group and hydroxyl proton.
Step 5: Ensure that the reaction conditions are optimized to prevent over-reduction or side reactions, such as the formation of toluene from benzyl alcohol.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Amide Hydrolysis
Amide hydrolysis is a chemical reaction where an amide reacts with water to form a carboxylic acid and an amine or ammonia. In the case of N-methylbenzamide, hydrolysis can lead to the formation of benzoic acid and methylamine. This reaction is typically catalyzed by either acidic or basic conditions, which facilitate the breaking of the carbon-nitrogen bond.
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Amide Nomenclature
Reduction Reactions
Reduction reactions involve the gain of electrons or the decrease in oxidation state of a molecule. In organic chemistry, reducing agents such as lithium aluminum hydride (LiAlH4) or sodium borohydride (NaBH4) can convert carbonyl compounds into alcohols. In this context, the reduction of benzoic acid (formed from the hydrolysis of N-methylbenzamide) to benzyl alcohol is a key step in the transformation.
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Functional Group Interconversion
Functional group interconversion refers to the transformation of one functional group into another within a molecule. In this case, converting the carboxylic acid (benzoic acid) into an alcohol (benzyl alcohol) is an example of functional group interconversion. This process is essential in organic synthesis, allowing chemists to modify compounds to achieve desired properties or reactivity.
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Related Practice
Textbook Question
What are the products of the following reactions? Show all stereoisomers that are formed.
c.
d.
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
How could you convert N-methylbenzamide to the following compounds?
a. N-methylbenzylamine
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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.
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Textbook Question
How could you convert N-methylbenzamide to the following compounds?
c. methyl benzoate
1
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