Domanda del libro di testo
Identify A–C. (Hint: A shows three singlets in its 1H NMR spectrum with integral ratios 3 : 2 : 3 and gives a positive iodoform test; see Problem 58.)
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Ch. 17 - Reactions at the Alpha-Carbon
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- 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
Capitolo 17, Problema 61
Show how 4-methyl-3-hexanol can be synthesized from 3-pentanone.
Guida verificata passo dopo passo1
Step 1: Begin with the starting material, 3-pentanone. Recognize that the target molecule, 4-methyl-3-hexanol, is an alcohol with a methyl group added to the carbon adjacent to the ketone group in 3-pentanone. This suggests a Grignard reaction as a key step.
Step 2: Prepare the Grignard reagent. React methyl bromide (CH₃Br) with magnesium (Mg) in an ether solvent to form the Grignard reagent, CH₃MgBr. This reagent will act as a nucleophile in the next step.
Step 3: Perform the nucleophilic addition reaction. Add the Grignard reagent (CH₃MgBr) to 3-pentanone. The carbonyl group (C=O) in 3-pentanone will undergo nucleophilic attack by the methyl group from the Grignard reagent, forming a tertiary alkoxide intermediate.
Step 4: Protonate the alkoxide intermediate. Treat the reaction mixture with a dilute acid, such as H₃O⁺, to protonate the alkoxide and form the desired alcohol, 4-methyl-3-hexanol.
Step 5: Verify the structure of the product. Confirm that the product has the correct connectivity and stereochemistry (if applicable) to ensure it matches the target molecule, 4-methyl-3-hexanol.
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Nucleophilic Addition
Nucleophilic addition is a fundamental reaction in organic chemistry where a nucleophile attacks an electrophilic carbon atom, typically in a carbonyl group. In the synthesis of 4-methyl-3-hexanol from 3-pentanone, this reaction is crucial as it allows the introduction of new carbon chains through the addition of nucleophiles, leading to the formation of alcohols.
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08:27
Nucleophilic Addition
Grignard Reagents
Grignard reagents are organomagnesium compounds that act as strong nucleophiles in organic synthesis. They can react with carbonyl compounds like ketones to form alcohols. In this synthesis, a Grignard reagent derived from an appropriate alkyl halide can be used to add a methyl group to 3-pentanone, ultimately yielding 4-methyl-3-hexanol.
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02:12Carbonation of Grignard Reagents
Reduction Reactions
Reduction reactions involve the gain of electrons or hydrogen, or the loss of oxygen, resulting in the conversion of carbonyl compounds to alcohols. In the context of synthesizing 4-methyl-3-hexanol, the reduction of the intermediate formed after nucleophilic addition is essential to convert the ketone functional group into the desired alcohol, completing the synthesis.
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07:12Reductive Amination
Pratica correlata
Domanda del libro di testo
Using cyclopentanone as the reactant, show the product of
b. an aldol addition.
c. an aldol condensation.
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Domanda del libro di testo
There are other condensation reactions similar to the aldol and Claisen condensations:
a. The Perkin condensation is the condensation of an aromatic aldehyde and acetic anhydride. Draw the product obtained from the following Perkin condensation:
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Domanda del libro di testo
A β-ɣ-unsaturated carbonyl compound rearranges to a more stable conjugated ⍺,β-unsaturated compound in the presence of either acid or base. b. Propose a mechanism for the acid-catalyzed rearrangement.
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Domanda del libro di testo
Show how the following compound can be synthesized from the given starting material. (Hint: Start with an acetoacetic ester.)
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Domanda del libro di testo
Using cyclopentanone as the reactant, show the product of a. acid-catalyzed keto–enol interconversion.
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