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 6
Bruice 8th EditionCh. 15 - Reactions of Carboxylic Acids and Carboxylic Acid DerivativesProblem 6Chapter 16, Problem 6
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.
Verified step by step guidance1
Understand the concept of delocalization energy: Delocalization energy refers to the stabilization energy gained when electrons are delocalized over a conjugated system. In organic molecules like esters and amides, this delocalization occurs due to resonance structures.
Analyze the resonance in esters: In esters, the lone pair of electrons on the oxygen atom can delocalize into the carbonyl group, creating resonance structures. However, the delocalization is limited because the oxygen atom is highly electronegative and less willing to share its lone pair.
Analyze the resonance in amides: In amides, the lone pair of electrons on the nitrogen atom can delocalize into the carbonyl group. Nitrogen is less electronegative than oxygen, making it more willing to share its lone pair, resulting in stronger resonance and greater delocalization energy compared to esters.
Compare the delocalization energies: Since the resonance in amides is stronger than in esters, the delocalization energy of an amide is higher (approximately 18 kcal/mol), while the delocalization energy of an ester is lower (approximately 10 kcal/mol).
Conclude the correct statement: Based on the analysis, the correct statement is 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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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Delocalization Energy
Delocalization energy refers to the stabilization that occurs when electrons are spread out over several atoms rather than being localized between two. This phenomenon is particularly significant in resonance structures, where the actual structure of a molecule is a hybrid of multiple forms. In organic compounds, delocalization can influence reactivity and stability, making it a crucial concept in understanding molecular behavior.
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Introduction to free energy diagrams.
Ester and Amide Structures
Esters and amides are both functional groups derived from carboxylic acids, but they have distinct structures and properties. Esters are formed from the reaction of an alcohol and a carboxylic acid, characterized by the -COO- group, while amides result from the reaction of an amine with a carboxylic acid, featuring the -CONH2 group. Understanding their structures helps in analyzing their stability and reactivity, particularly in relation to delocalization energy.
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Comparative Stability
Comparative stability in organic chemistry often involves evaluating the energy associated with different functional groups. In the context of esters and amides, the delocalization energy can indicate which compound is more stable. Generally, amides exhibit greater delocalization due to resonance involving the nitrogen atom, leading to a higher stabilization energy compared to esters, which is essential for answering questions about their relative energies.
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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
Which is longer, the carbon–oxygen single bond in a carboxylic acid or the carbon–oxygen bond in an alcohol? Why?
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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? a. a stronger base than the substituent that is attached to the acyl group
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Textbook Question
Draw the structure for each of the following:
i. α-chlorovaleric acid
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Textbook Question
There are three carbon–oxygen bonds in methyl acetate.
a. What are their relative bond lengths?
b. What are the relative infrared (IR) stretching frequencies of these bonds?
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