Textbook Question
What product do you expect to obtain from each of the following reactions?
a.
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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 88
Bruice 8th EditionCh. 15 - Reactions of Carboxylic Acids and Carboxylic Acid DerivativesProblem 88Chapter 16, Problem 88
The intermediate shown here is formed during the hydroxide-ion-promoted hydrolysis of the ester group. Propose a mechanism for the reaction.
Verified step by step guidance1
Identify the reaction type: This is a base-catalyzed hydrolysis of an ester, also known as saponification. The hydroxide ion (HO⁻) acts as a nucleophile, attacking the ester carbonyl carbon.
Step 1: Nucleophilic attack. The hydroxide ion (HO⁻) attacks the carbonyl carbon of the ester, forming a tetrahedral intermediate. Represent this step using the following mechanism:
Step 2: Collapse of the tetrahedral intermediate. The intermediate collapses, expelling the leaving group (CF₃CH₂O⁻) and forming a carboxylic acid derivative. This step involves the reformation of the carbonyl group.
Step 3: Deprotonation of the carboxylic acid. The hydroxide ion (HO⁻) deprotonates the carboxylic acid, forming a carboxylate anion (RCOO⁻) and water (H₂O).
Step 4: Identify the products. The final products of the reaction are the carboxylate salt (RCOO⁻) and the alcohol (CF₃CH₂OH), which was the leaving group in Step 2.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Ester Hydrolysis
Ester hydrolysis is a chemical reaction where an ester reacts with water to form an alcohol and a carboxylic acid. In the presence of a base, such as hydroxide ion (OH-), the reaction proceeds via nucleophilic attack on the carbonyl carbon of the ester, leading to the formation of a tetrahedral intermediate. This intermediate then collapses to yield the products, typically an alcohol and a carboxylate ion.
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Nucleophilic Attack
Nucleophilic attack is a fundamental concept in organic chemistry where a nucleophile, which is an electron-rich species, attacks an electron-deficient atom, usually carbon. In the context of ester hydrolysis, the hydroxide ion acts as the nucleophile, attacking the carbonyl carbon of the ester. This step is crucial as it initiates the reaction mechanism and leads to the formation of the tetrahedral intermediate.
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Tetrahedral Intermediate
A tetrahedral intermediate is a transient species formed during reactions involving carbonyl compounds, where the carbon atom becomes sp3 hybridized. In ester hydrolysis, the nucleophilic attack by hydroxide ion results in the formation of this intermediate, which is characterized by a tetrahedral geometry around the carbon atom. The stability and subsequent breakdown of this intermediate are key to understanding the overall reaction mechanism.
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Related Practice
Textbook Question
The following compound has been found to be an inhibitor of penicillinase. The enzyme can be reactivated by hydroxylamine (NH2OH). Propose a mechanism to account for the reactivation.
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Textbook Question
The following compound has been found to be an inhibitor of penicillinase. The enzyme can be reactivated by hydroxylamine (NH2OH). Propose a mechanism to account for the inhibition.
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Textbook Question
Show how the following compounds could be prepared from the given starting materials. You can use any necessary organic or inorganic reagents.
c.
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Textbook Question
Show how the following compounds could be prepared from the given starting materials. You can use any necessary organic or inorganic reagents.
d.
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Textbook Question
Propose a mechanism that accouts for the formation of the product.
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