Textbook Question
Draw the product of the reaction of each of the following compounds with a base:
b.
1
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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 34
Can 2,4-pentanedione undergo an intramolecular aldol addition? If so, why? If not, why not?
Verified step by step guidance1
Identify the functional groups in 2,4-pentanedione. It contains two ketone groups at positions 2 and 4, making it a 1,3-diketone.
Recall the requirements for an intramolecular aldol addition. This reaction occurs when a compound has two carbonyl groups (aldehydes or ketones) that are close enough to form a stable cyclic product upon reaction.
Determine if 2,4-pentanedione can form an enolate ion. The alpha-hydrogens (hydrogens on the carbon adjacent to a carbonyl group) in 2,4-pentanedione are acidic and can be deprotonated to form an enolate ion.
Analyze the potential for cyclization. The enolate ion formed from one carbonyl group can attack the carbonyl carbon of the other group, forming a new C-C bond. In this case, the reaction would result in the formation of a five-membered ring, which is generally stable.
Conclude that 2,4-pentanedione can undergo an intramolecular aldol addition because it meets the criteria: it has two carbonyl groups, acidic alpha-hydrogens to form an enolate, and the ability to form a stable five-membered ring upon cyclization.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Aldol Addition
Aldol addition is a reaction in which an enolate ion reacts with a carbonyl compound to form a β-hydroxy carbonyl compound. This reaction typically occurs between two aldehydes or ketones, leading to the formation of larger molecules. Understanding this process is crucial for analyzing whether a compound can undergo intramolecular aldol addition.
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Intramolecular Reactions
Intramolecular reactions occur within a single molecule, where functional groups are positioned such that they can react with each other. In the case of intramolecular aldol addition, the distance between the reactive carbonyl and enolate groups must be suitable for the reaction to occur. This concept is essential for determining if 2,4-pentanedione can form a cyclic product through intramolecular aldol addition.
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Structural Features of 2,4-Pentanedione
2,4-Pentanedione is a diketone with two carbonyl groups located at the 2 and 4 positions of a five-carbon chain. Its structure allows for the formation of an enolate at one carbonyl, which can then react with the other carbonyl within the same molecule. Recognizing these structural features is vital for assessing the feasibility of intramolecular aldol addition in this compound.
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Related Practice
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Draw the product of the reaction of each of the following compounds with a base:
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1
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