Textbook Question
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(f)
2
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Ch. 18 - Ketones and Aldehydes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- 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
Chapter 18, Problem 47e
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(e) 
Verified step by step guidance1
Step 1: Analyze the transformation. The starting material is acetic acid (CH3COOH), and the product is methyl vinyl ketone (CH3COCH=CH2). This involves converting a carboxylic acid into an α,β-unsaturated ketone.
Step 2: Convert the carboxylic acid into an acid chloride. Use thionyl chloride (SOCl2) or oxalyl chloride (COCl2) in the presence of a base like pyridine to replace the hydroxyl group (-OH) with a chlorine atom, forming acetyl chloride (CH3COCl).
Step 3: Perform a reaction to introduce the vinyl group. Use a Wittig reaction or a similar method to form the double bond. For example, react acetyl chloride with a phosphorus ylide (Ph3P=CH2) to generate the α,β-unsaturated ketone.
Step 4: Ensure the reaction conditions are optimized for good yield. Use an appropriate solvent like dichloromethane (CH2Cl2) and maintain the reaction temperature to avoid side reactions.
Step 5: Purify the product. Use distillation or chromatography to isolate methyl vinyl ketone and confirm its structure using spectroscopic techniques like NMR or IR.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Aldehyde Reactivity
Aldehydes are highly reactive carbonyl compounds characterized by the presence of a carbonyl group (C=O) bonded to at least one hydrogen atom. This reactivity allows them to undergo various nucleophilic addition reactions, including the formation of imines when reacted with primary amines. Understanding the electrophilic nature of the carbonyl carbon is crucial for predicting the outcome of reactions involving aldehydes.
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01:34
Name the aldehyde
Imine Formation
Imine formation occurs when an aldehyde or ketone reacts with a primary amine, resulting in the condensation of the carbonyl compound and the amine to form an imine (C=N). This reaction typically involves the nucleophilic attack of the amine on the carbonyl carbon, followed by the elimination of water. The stability and reactivity of imines make them important intermediates in organic synthesis.
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Reaction Conditions and Catalysts
The efficiency and yield of the conversion from aldehyde to imine can be influenced by various reaction conditions, including temperature, solvent choice, and the presence of catalysts. Acidic or basic conditions can facilitate the reaction by protonating the carbonyl oxygen or deprotonating the amine, respectively. Selecting appropriate solvents and reagents is essential for optimizing the reaction pathway and achieving high yields.
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Related Practice
Textbook Question
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(c)
1
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Textbook Question
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(g)
1
views
Textbook Question
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(b)
3
views
Textbook Question
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(h)
1
views
Textbook Question
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(d)
2
views