Textbook Question
Describe how the following compounds can be prepared using an aldol addition in the first step of the synthesis:
c.
Ch. 17 - Reactions at the Alpha-Carbon
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
Chapter 18, Problem 26
What two carbonyl compounds are required for the synthesis of morachalcone A, via a Claisen–Schmidt condensation?
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Verified step by step guidance1
Understand the Claisen–Schmidt condensation: This reaction involves the condensation of an aldehyde or ketone with another carbonyl compound in the presence of a base to form an α,β-unsaturated carbonyl compound. Typically, one of the reactants lacks an α-hydrogen to prevent self-condensation.
Analyze the structure of morachalcone A: Morachalcone A is a chalcone, which is an α,β-unsaturated ketone. It has a conjugated system with a double bond between the α and β carbons and a ketone group on the β carbon. Identify the two fragments that could combine to form this structure.
Determine the aromatic aldehyde: The aromatic ring attached to the α-carbon in morachalcone A suggests that one of the starting materials is an aromatic aldehyde. Identify the specific aldehyde based on the substituents on the aromatic ring in morachalcone A.
Determine the ketone: The ketone group in morachalcone A indicates that the second starting material is a ketone. The structure of morachalcone A will help you identify the specific ketone required for the reaction.
Combine the two carbonyl compounds: Write the reaction mechanism for the Claisen–Schmidt condensation, showing the base-catalyzed deprotonation of the ketone to form an enolate ion, followed by nucleophilic attack on the aldehyde, and finally dehydration to form the α,β-unsaturated ketone (morachalcone A).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Claisen–Schmidt Condensation
The Claisen–Schmidt condensation is a reaction between an aldehyde and a ketone in the presence of a base, leading to the formation of an α,β-unsaturated carbonyl compound. This reaction involves the nucleophilic attack of the enolate ion derived from one carbonyl compound on the carbonyl carbon of the other, followed by dehydration. Understanding this mechanism is crucial for identifying the specific carbonyl compounds needed for synthesizing morachalcone A.
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Claisen-Schmidt Reaction
Carbonyl Compounds
Carbonyl compounds are organic molecules that contain a carbon atom double-bonded to an oxygen atom (C=O). They include aldehydes, ketones, and carboxylic acids, each with distinct reactivity patterns. In the context of the Claisen–Schmidt condensation, recognizing the types of carbonyl compounds involved is essential for predicting the products and understanding the synthesis of complex molecules like morachalcone A.
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Morachalcone A
Morachalcone A is a specific type of flavonoid compound known for its biological activity and potential therapeutic applications. Its synthesis often involves strategic reactions, such as the Claisen–Schmidt condensation, to construct its carbon skeleton. Identifying the correct carbonyl precursors is vital for successfully synthesizing morachalcone A and understanding its structural features and functions.
Related Practice
Textbook Question
Describe how the following compounds can be prepared using an aldol addition in the first step of the synthesis:
a.
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Textbook Question
Which of the following esters cannot undergo a Claisen condensation?
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Textbook Question
Draw the products of the following reactions:
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Textbook Question
Draw the products of the following reactions:
a.
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Textbook Question
Describe how the following compounds can be prepared using an aldol addition in the first step of the synthesis:
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