Domanda del libro di testo
Show how the following compounds can be made using the malonic ester synthesis.
(a) 3-phenylpropanoic acid
(b) 2-methylpropanoic acid
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Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
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Wade 9th EditionCh. 22 - Condensations and Alpha Substitutions of Carbonyl CompoundsProblema 49
Wade 9th EditionCh. 22 - Condensations and Alpha Substitutions of Carbonyl CompoundsProblema 49Capitolo 22, Problema 49
Show the ketones that would result from hydrolysis and decarboxylation of the following β-keto esters.
Guida verificata passo dopo passo1
Step 1: Understand the reaction mechanism. Hydrolysis of β-keto esters involves breaking the ester bond in the presence of water and acid/base, forming a β-keto acid. Decarboxylation then removes the carboxyl group as CO₂, leaving behind a ketone.
Step 2: Analyze structure (a). The β-keto ester contains a phenyl group (PhCH₂), a methyl group (CH₃), and an ethyl ester group (COOC₂H₅). Hydrolysis will convert the ester group into a carboxylic acid, and decarboxylation will remove the carboxyl group, leaving a ketone with the phenyl and methyl groups attached to the central carbon.
Step 3: Analyze structure (b). The β-keto ester contains a cyclobutane ring, a methyl group (CH₃), and an ethyl ester group (COOCH₂CH₃). Hydrolysis will convert the ester group into a carboxylic acid, and decarboxylation will remove the carboxyl group, leaving a ketone with the cyclobutane ring and methyl group attached to the central carbon.
Step 4: Analyze structure (c). The β-keto ester contains a cyclopentanone ring and an ethyl ester group (OCH₂CH₃). Hydrolysis will convert the ester group into a carboxylic acid, and decarboxylation will remove the carboxyl group, leaving a ketone with the cyclopentanone ring intact.
Step 5: Summarize the results. For each β-keto ester, the hydrolysis and decarboxylation reactions yield a ketone. The specific ketone depends on the substituents attached to the β-keto ester structure. Ensure you understand how the ester group is hydrolyzed and how the carboxyl group is removed during decarboxylation.
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β-Keto Esters
β-keto esters are organic compounds that contain both a ketone and an ester functional group, with the carbonyl of the ketone located at the β position relative to the ester group. This structure allows for unique reactivity, particularly in reactions involving hydrolysis and decarboxylation, which can lead to the formation of ketones. Understanding the structure and reactivity of β-keto esters is crucial for predicting the products of these reactions.
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Ester Nomenclature
Hydrolysis
Hydrolysis is a chemical reaction involving the breakdown of a compound by water, often resulting in the formation of an alcohol and a carboxylic acid from esters. In the context of β-keto esters, hydrolysis can lead to the release of the ketone and the corresponding carboxylic acid. This reaction is typically catalyzed by acids or bases and is essential for understanding how β-keto esters can be transformed into simpler ketones.
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Percorso guidato
1:00Hydrolysis of Thioesters Concept 2
Decarboxylation
Decarboxylation is the process of removing a carboxyl group from a molecule, releasing carbon dioxide (CO2). In the case of β-keto esters, after hydrolysis, the resulting carboxylic acid can undergo decarboxylation, leading to the formation of a ketone. This reaction is significant in organic synthesis as it allows for the generation of ketones from β-keto esters, which are valuable intermediates in various chemical processes.
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02:32Predict the correct structure
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