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 66
Solving the following road-map problem depends on determining the structure of A, the key intermediate. Give structures for compounds A through K.
Guida verificata passo dopo passo1
Step 1: Analyze the first reaction. The Grignard reagent (MgBr) reacts with acetaldehyde (CH₃CHO) followed by acid workup (H₃O⁺). This forms a secondary alcohol, compound B. The Grignard reagent adds to the carbonyl group of acetaldehyde, creating a new C-C bond.
Step 2: Compound B undergoes oxidation using NaOCl in acetic acid (HOAc). This converts the secondary alcohol into a ketone, compound A. The reaction mechanism involves the oxidation of the hydroxyl group to a carbonyl group.
Step 3: Compound A reacts with (CH₃)₂CuLi, a Gilman reagent. This reagent performs a conjugate addition to the ketone, forming compound D. The Gilman reagent adds a methyl group to the α-carbon of the ketone.
Step 4: Compound D is treated with SOCl₂, which converts the alcohol group into a chloride group, forming compound C. This reaction involves the substitution of the hydroxyl group with a chlorine atom.
Step 5: Compound A reacts with pent-1-yne to form compound E, which is then subjected to ozonolysis (O₃, -78°C) followed by reduction with Me₂S and H₂O to yield compound F. Ozonolysis cleaves the triple bond in pent-1-yne, forming aldehydes or ketones depending on the structure.
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:
16mConcetti 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 like aldehydes and ketones. This reaction leads to the formation of a new carbon-carbon bond and is crucial for constructing complex organic molecules. Understanding this mechanism is essential for predicting the structures of intermediates in reaction pathways.
Video consigliato:
08:27
Nucleophilic Addition
Grignard Reagents
Grignard reagents, formed by the reaction of alkyl or aryl halides with magnesium, are powerful nucleophiles used in organic synthesis. They can react with carbonyl compounds to form alcohols after hydrolysis. Recognizing how Grignard reagents interact with various functional groups is vital for determining the structure of intermediate A in the reaction roadmap.
Video consigliato:
02:12Carbonation of Grignard Reagents
Oxidation and Reduction Reactions
Oxidation and reduction reactions involve the transfer of electrons between species, leading to changes in oxidation states. In organic chemistry, these reactions are often used to convert alcohols to carbonyls or vice versa. Understanding these processes is key to identifying the transformations occurring in the reaction roadmap, particularly in the conversion of intermediates A through K.
Video consigliato:
00:54Distinguishing between Oxidation and Reduction
Pratica correlata
Domanda del libro di testo
Within each set of structures, indicate which will react fastest, and which slowest, toward nucleophilic addition in basic conditions.
(a)
807
views
Domanda del libro di testo
Hydration of alkynes (via oxymercuration) gives good yields of single compounds only with symmetrical or terminal alkynes. Show what the products would be from hydration of each compound.
e. 3-methylcyclodecyne
717
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.)
(d) CH3CH2CH2CH2CH(OH)OCH3
(e) CH3CH2CH2CH2CH(OCH3)2
(f)
1217
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
Within each set of structures, indicate which will react fastest, and which slowest, toward nucleophilic addition in basic conditions.
(b)
601
views