Domanda del libro di testo
Give the important resonance forms for the possible enolate ions of the following:
(e)
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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 6
Wade 9th EditionCh. 22 - Condensations and Alpha Substitutions of Carbonyl CompoundsProblema 6Capitolo 22, Problema 6
Propose a mechanism for the acid-catalyzed reaction of cyclohexanone with pyrrolidine.
Guida verificata passo dopo passo1
Identify the reaction type: This is an acid-catalyzed reaction between a ketone (cyclohexanone) and a secondary amine (pyrrolidine). Such reactions typically form an imine or an enamine through a condensation mechanism.
Step 1: Protonation of the carbonyl group. The acid catalyst donates a proton to the oxygen atom of the carbonyl group in cyclohexanone, increasing the electrophilicity of the carbonyl carbon. This makes it more susceptible to nucleophilic attack.
Step 2: Nucleophilic attack by pyrrolidine. The nitrogen atom in pyrrolidine, which has a lone pair of electrons, attacks the electrophilic carbonyl carbon, forming a tetrahedral intermediate.
Step 3: Proton transfer and elimination of water. A proton transfer occurs within the intermediate, followed by the elimination of a water molecule. This step forms a positively charged iminium ion intermediate.
Step 4: Deprotonation to form the final product. The iminium ion loses a proton, resulting in the formation of the enamine product. The acid catalyst is regenerated in this step, completing the catalytic cycle.
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Acid-Catalyzed Reactions
Acid-catalyzed reactions involve the use of an acid to increase the rate of a chemical reaction. In these reactions, the acid donates a proton (H+) to a reactant, enhancing its electrophilicity and facilitating nucleophilic attack. Understanding the role of the acid is crucial for predicting the reaction pathway and the stability of intermediates formed during the process.
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Acid Catalyzed
Nucleophilic Addition
Nucleophilic addition is a fundamental reaction mechanism in organic chemistry where a nucleophile attacks an electrophilic carbon atom, typically in a carbonyl group. In the case of cyclohexanone, the carbonyl carbon is susceptible to attack by nucleophiles like pyrrolidine, leading to the formation of an intermediate. This step is essential for understanding how the reaction proceeds and the nature of the products formed.
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08:27Nucleophilic Addition
Mechanistic Pathways
Mechanistic pathways describe the step-by-step sequence of elementary reactions that occur during a chemical transformation. For the reaction of cyclohexanone with pyrrolidine, outlining the mechanistic steps, including protonation, nucleophilic attack, and subsequent deprotonation, is vital for predicting the final product and understanding the reaction's overall dynamics. This knowledge helps in visualizing how reactants convert into products.
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Percorso guidato
2:13Energy Production In Biochemical Pathways Concept 1
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Give the important resonance forms for the possible enolate ions of the following:
(f)
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Without looking back, propose a mechanism for the hydrolysis of this iminium salt to the alkylated ketone. The first step is attack by water, followed by loss of a proton to give a carbinolamine. Protonation on nitrogen allows pyrrolidine to leave, giving the protonated ketone.
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Give the expected products of the following acid-catalyzed reactions.
(a) acetophenone + methylamine
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Give the expected products of the following acid-catalyzed reactions.
(b) acetophenone + dimethylamine
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