Textbook Question
a. When a carboxylic acid is dissolved in isotopically labeled water (H2O18) and an acid catalyst is added, the label is incorporated into both oxygens of the acid. Propose a mechanism to account for this.
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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 74a
Bruice 8th EditionCh. 15 - Reactions of Carboxylic Acids and Carboxylic Acid DerivativesProblem 74aChapter 16, Problem 74a
a. Identify the two products obtained from the following reaction:
Verified step by step guidance1
Step 1: Analyze the reactants. The molecule on the left is an amino alcohol, containing both an amine (-NH2) group and a hydroxyl (-OH) group. The molecule on the right is acetic anhydride, which is a reactive compound used to acetylate functional groups. The reaction involves an excess of acetic anhydride.
Step 2: Identify the functional groups that will react. Acetic anhydride reacts with nucleophilic groups such as amines and alcohols. The amine group (-NH2) will undergo acetylation to form an amide, and the hydroxyl group (-OH) will undergo acetylation to form an ester.
Step 3: Predict the reaction at the amine group. The amine group reacts with acetic anhydride to form an amide. The general reaction is: \( \text{R-NH}_2 + (CH_3CO)_2O \rightarrow \text{R-NHCOCH}_3 + CH_3COOH \).
Step 4: Predict the reaction at the hydroxyl group. The hydroxyl group reacts with acetic anhydride to form an ester. The general reaction is: \( \text{R-OH} + (CH_3CO)_2O \rightarrow \text{R-OCOCH}_3 + CH_3COOH \).
Step 5: Combine the results. The final products are an amide formed from the acetylation of the amine group and an ester formed from the acetylation of the hydroxyl group. Both reactions produce acetic acid as a byproduct.
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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 carbonyl carbon of an acyl compound, leading to the replacement of a leaving group. This reaction is common in the formation of carboxylic acid derivatives, such as esters and amides, and is characterized by the formation of a tetrahedral intermediate before the leaving group is expelled.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
Carboxylic Acid Derivatives
Carboxylic acid derivatives include compounds like esters, amides, and anhydrides, which can be formed from carboxylic acids. These derivatives retain the carbonyl group and can undergo nucleophilic acyl substitution reactions. Understanding the reactivity and properties of these derivatives is crucial for predicting the products of reactions involving them.
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Reaction Mechanism
A reaction mechanism describes the step-by-step process by which reactants are converted into products. In nucleophilic acyl substitution, the mechanism involves the nucleophile attacking the carbonyl carbon, forming a tetrahedral intermediate, followed by the elimination of a leaving group. Analyzing the mechanism helps in understanding the conditions required for the reaction and the nature of the products formed.
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Related Practice
Textbook Question
An aqueous solution of a primary or secondary amine reacts with an acyl chloride to form an amide as the major product. However, if the amine is tertiary, an amide is not formed. What product is formed? Explain.
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Textbook Question
Phosgene (COCl2) was used as a poison gas in World War I. What product would be formed from the reaction of phosgene with each of the following reagents?
c. excess propylamine
d. excess water
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Textbook Question
When a student treated butanedioic acid with thionyl chloride, she was surprised to find that the product she obtained was an anhydride rather than an acyl chloride. Propose a mechanism to explain why she obtained an anhydride.
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Textbook Question
a. When a carboxylic acid is dissolved in isotopically labeled water (H2O18) and an acid catalyst is added, the label is incorporated into both oxygens of the acid. Propose a mechanism to account for this.
c. If an ester is dissolved in isotopically labeled water (H2O18) and an acid catalyst is added, where will the label reside in the product?
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Textbook Question
When butanoic acid and 18O-labeled methanol react under acidic conditions, what compounds are labeled when the reaction has reached equilibrium?
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