Textbook Question
Show how you would accomplish the following syntheses efficiently and in good yield. You may use any necessary reagents.
(a) acetaldehyde → lactic acid, CH3CH(OH)COOH
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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 51d
Show how you would accomplish the following synthetic conversions efficiently and in good yield. You may use any necessary additional reagents and solvents.
(d) 
Verified step by step guidance1
Step 1: Analyze the starting material and product. The starting material is a cyclopentanone with an aldehyde group (-CHO) at the 2-position. The product is a cyclopentane derivative with a hydroxyl group (-OH) and a hydrogen added to the alpha-carbon of the ketone group, indicating an aldol addition reaction.
Step 2: Identify the reaction type. This transformation involves an aldol addition reaction, where the enolate ion formed from the ketone reacts with the aldehyde group to form a β-hydroxy ketone.
Step 3: Choose the appropriate base. Use a mild base such as sodium hydroxide (NaOH) or potassium hydroxide (KOH) to generate the enolate ion from the ketone group. Ensure the reaction is carried out in an aqueous or alcoholic solvent to facilitate the aldol addition.
Step 4: Allow the enolate ion to attack the aldehyde group. The enolate ion formed from the ketone will act as a nucleophile and attack the electrophilic carbonyl carbon of the aldehyde group, forming a new C-C bond and resulting in the β-hydroxy ketone product.
Step 5: Optimize reaction conditions for good yield. Control the temperature and reaction time to prevent side reactions such as aldol condensation. Use purification techniques like recrystallization or chromatography to isolate the desired product efficiently.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Synthetic Pathways
Synthetic pathways refer to the series of chemical reactions and transformations that convert starting materials into desired products. Understanding these pathways is crucial for planning efficient syntheses, as it involves selecting appropriate reagents, conditions, and reaction mechanisms to achieve high yields and minimize by-products.
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Reagents and Solvents
Reagents are substances used to bring about a chemical reaction, while solvents are the mediums in which reactions occur. Choosing the right reagents and solvents is essential for optimizing reaction conditions, influencing factors such as solubility, reactivity, and selectivity, which ultimately affect the yield and efficiency of the synthetic conversion.
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Reaction Mechanisms
Reaction mechanisms describe the step-by-step sequence of elementary reactions that occur during a chemical transformation. A thorough understanding of these mechanisms allows chemists to predict the outcomes of reactions, identify potential side reactions, and design strategies to enhance product formation and yield in synthetic processes.
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Related Practice
Textbook Question
Show how you would accomplish the following syntheses efficiently and in good yield. You may use any necessary reagents.
(e)
583
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Textbook Question
Show how you would accomplish the following syntheses efficiently and in good yield. You may use any necessary reagents.
(g)
434
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Textbook Question
Propose mechanisms for the following reactions.
(f)
1416
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Textbook Question
Show how you would synthesize the following derivatives from appropriate carbonyl compounds.
(a)
757
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Textbook Question
Show how you would accomplish the following syntheses efficiently and in good yield. You may use any necessary reagents.
(b)
1085
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