Textbook Question
Show how you would accomplish the following syntheses. You may use whatever additional reagents you need.
(d)
1
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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 29a
Show how you would accomplish the following syntheses. You may use whatever additional reagents you need.
(a) 
Verified step by step guidance1
Step 1: Analyze the transformation. The reaction involves converting an aldehyde group (-CHO) into a primary alcohol (-CH2OH) while retaining the ketone group in the cyclic structure.
Step 2: Identify the type of reaction. This is a reduction reaction, where the aldehyde is reduced to an alcohol. A common reagent for this transformation is sodium borohydride (NaBH4), which selectively reduces aldehydes and ketones.
Step 3: Select appropriate conditions. Sodium borohydride (NaBH4) is typically used in a protic solvent like ethanol or methanol to facilitate the reduction reaction.
Step 4: Write the reaction mechanism. The hydride ion (H-) from NaBH4 attacks the carbonyl carbon of the aldehyde, breaking the π bond and forming a tetrahedral intermediate. Protonation of the intermediate by the solvent leads to the formation of the primary alcohol.
Step 5: Verify the product. The ketone group remains intact, and the aldehyde is successfully converted into a primary alcohol, yielding the desired product.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Oxidation and Reduction Reactions
In organic chemistry, oxidation refers to the loss of electrons or an increase in oxidation state, often involving the addition of oxygen or the removal of hydrogen. Conversely, reduction is the gain of electrons or a decrease in oxidation state, typically involving the addition of hydrogen or the removal of oxygen. Understanding these concepts is crucial for predicting the products of reactions, such as the conversion of an aldehyde to an alcohol.
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Distinguishing between Oxidation and Reduction
Aldehyde to Alcohol Conversion
The transformation of an aldehyde to an alcohol is a common reaction in organic synthesis, typically achieved through reduction. This can be accomplished using reducing agents like lithium aluminum hydride (LiAlH4) or sodium borohydride (NaBH4). Recognizing the functional groups involved and the appropriate reagents is essential for successfully carrying out this synthesis.
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04:30Comparing and contrasting the Alcohol Conversions.
Stereochemistry and Isomerism
Stereochemistry involves the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the context of the synthesis shown, understanding stereochemistry is important, especially if the product can exist as different isomers. This knowledge helps predict the properties and reactivity of the synthesized compound, which is vital for further applications in organic chemistry.
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Related Practice
Textbook Question
Propose a mechanism for the acid-catalyzed reaction of cyclohexanone with ethylene glycol to give cyclohexanone ethylene acetal.
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Textbook Question
Show how you would accomplish the following syntheses. You may use whatever additional reagents you need.
(c)
1
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Textbook Question
Show how you would accomplish the following syntheses. You may use whatever additional reagents you need.
(b)
1
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Textbook Question
Propose a mechanism for the acid-catalyzed hydrolysis of cyclohexanone ethylene acetal.
1
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Textbook Question
Propose a mechanism for the acid-catalyzed hydrolysis of the acetal given in Problem 18-26(f).
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