Domanda del libro di testo
Show how the following compounds can be prepared, using ethyne as one of the starting materials:
2. 1-phenyl-2-butyn-1-ol
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Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives
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
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Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblema 9
Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblema 9Capitolo 16, Problema 9
Which of the following secondary alcohols can be prepared by the reaction of methyl formate with excess Grignard reagent?
Guida verificata passo dopo passo1
Step 1: Understand the reaction mechanism. Methyl formate (HCOOCH3) reacts with a Grignard reagent (R-MgX) in excess to form a secondary alcohol. The Grignard reagent adds to the carbonyl group of the ester, and after hydrolysis, a secondary alcohol is obtained.
Step 2: Analyze the structure of methyl formate. The carbonyl group (C=O) in methyl formate is the reactive site where the Grignard reagent will attack. The first equivalent of the Grignard reagent will replace the -OCH3 group, forming an intermediate ketone.
Step 3: Consider the role of excess Grignard reagent. The second equivalent of the Grignard reagent will attack the ketone intermediate, forming a tertiary alkoxide ion. Upon hydrolysis, this alkoxide ion is converted into a secondary alcohol.
Step 4: Match the product structure. The secondary alcohol formed will have the R group from the Grignard reagent attached to the carbon that was originally part of the carbonyl group in methyl formate. Analyze the options to determine which secondary alcohol matches this structure.
Step 5: Verify the correct answer. For each option, consider the structure of the secondary alcohol and determine if it can be formed by the reaction of methyl formate with a specific Grignard reagent. The correct answer will correspond to the alcohol that matches the described reaction mechanism.
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Grignard Reagents
Grignard reagents are organomagnesium compounds that react with electrophiles to form carbon-carbon bonds. They are highly reactive and can add to carbonyl compounds, such as aldehydes and ketones, to form alcohols. Understanding their reactivity is crucial for predicting the products of reactions involving secondary alcohols.
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02:12
Carbonation of Grignard Reagents
Methyl Formate
Methyl formate is an ester that can act as a carbonyl compound in reactions with Grignard reagents. When a Grignard reagent reacts with methyl formate, it first forms a magnesium alkoxide intermediate, which can then be hydrolyzed to yield a secondary alcohol. Recognizing the structure and reactivity of methyl formate is essential for determining the possible alcohol products.
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02:26Formation of Enolates
Secondary Alcohols
Secondary alcohols are characterized by having the hydroxyl (-OH) group attached to a carbon atom that is connected to two other carbon atoms. The formation of secondary alcohols from the reaction of Grignard reagents with carbonyl compounds is a key concept in organic synthesis. Identifying which products are secondary alcohols helps in selecting the correct answer from the options provided.
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1:24Secondary Protein Structure Example 2
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