Domanda del libro di testo
Within each set of structures, indicate which will react fastest, and which slowest, toward nucleophilic addition in basic conditions.
(c)
473
views
Ch. 18 - Ketones and Aldehydes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
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
Capitolo 18, Problema 67a
Within each set of structures, indicate which will react fastest, and which slowest, toward nucleophilic addition in basic conditions.
(a) 
Guida verificata passo dopo passo1
Step 1: Analyze the chemical structures provided. The three compounds are: (1) an aromatic ketone (acetophenone), (2) an aliphatic aldehyde (cyclohexanecarbaldehyde), and (3) an aliphatic ketone (cyclohexanone).
Step 2: Recall the general reactivity trend for nucleophilic addition in basic conditions. Aldehydes are generally more reactive than ketones due to less steric hindrance and greater electrophilicity of the carbonyl carbon. Aromatic ketones are less reactive than aliphatic ketones due to resonance stabilization of the carbonyl group.
Step 3: Compare the steric and electronic effects of each compound. The aldehyde (cyclohexanecarbaldehyde) has the least steric hindrance and no resonance stabilization, making it the most reactive. The aromatic ketone (acetophenone) has resonance stabilization, making it the least reactive. The aliphatic ketone (cyclohexanone) falls in between due to moderate steric hindrance and no resonance stabilization.
Step 4: Rank the compounds based on their reactivity toward nucleophilic addition in basic conditions: (1) Cyclohexanecarbaldehyde (fastest), (2) Cyclohexanone (intermediate), (3) Acetophenone (slowest).
Step 5: Conclude that the reactivity is influenced by steric hindrance and electronic effects, with aldehydes being more reactive than ketones, and aromatic ketones being less reactive due to resonance stabilization.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
3mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Nucleophilic Addition
Nucleophilic addition is a fundamental reaction in organic chemistry where a nucleophile attacks an electrophilic carbon atom, typically in carbonyl compounds. This reaction is crucial for forming new carbon-carbon or carbon-heteroatom bonds. The rate of nucleophilic addition can be influenced by the electrophilicity of the carbonyl carbon and the strength of the nucleophile.
Video consigliato:
08:27
Nucleophilic Addition
Electrophilicity
Electrophilicity refers to the tendency of a chemical species to accept electrons, making it a target for nucleophiles. In the context of carbonyl compounds, the carbon atom is electrophilic due to the polarization of the carbon-oxygen double bond. Factors such as steric hindrance and the presence of electron-withdrawing groups can enhance or diminish the electrophilicity of the carbonyl carbon.
Video consigliato:
03:Nucleophile or Electrophile
Basic Conditions
Basic conditions in organic chemistry typically involve the presence of a base that can deprotonate acidic protons, thereby increasing the nucleophilicity of certain species. In nucleophilic addition reactions, basic conditions can also stabilize the transition state and influence the reactivity of the nucleophile. Understanding how basicity affects reaction pathways is essential for predicting the rates of nucleophilic addition.
Video consigliato:
06:21Understanding the difference between basicity and nucleophilicity.
Pratica correlata
Domanda del libro di testo
Which of the following compounds would give a positive Tollens test? (Remember that the Tollens test involves mild basic aqueous conditions.)
(d) CH3CH2CH2CH2CH(OH)OCH3
(e) CH3CH2CH2CH2CH(OCH3)2
(f)
1217
views
Domanda del libro di testo
One of these reacts with dilute aqueous acid and the other does not. Give a mechanism for the one that reacts, and show why this mechanism does not work for the other one.
(a)
866
views
Domanda del libro di testo
Which of the following compounds would give a positive Tollens test? (Remember that the Tollens test involves mild basic aqueous conditions.)
(a) CH3CH2CH2COCH3
(b) CH3CH2CH2CH2CHO
(c) CH3CH=CHCH=CHOH
1502
views
Domanda del libro di testo
Solving the following road-map problem depends on determining the structure of A, the key intermediate. Give structures for compounds A through K.
1956
views
Domanda del libro di testo
Within each set of structures, indicate which will react fastest, and which slowest, toward nucleophilic addition in basic conditions.
(b)
601
views