Textbook Question
Show how you would synthesize octanal from each compound. You may use any necessary reagents.
(g) ethyl octanoate
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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 57a
Both NaBH4 and NaBD4 are commercially available, and D2O is common and inexpensive. Show how you would synthesize the following labeled compounds, starting with butan-2-one.
(a) 
Verified step by step guidance1
Step 1: Begin with butan-2-one (CH3COCH2CH3), which is a ketone. The goal is to reduce the ketone group to an alcohol group while introducing a deuterium (D) atom.
Step 2: Use NaBD4 (sodium borodeuteride) as the reducing agent. NaBD4 is specifically used to introduce deuterium during the reduction process. The hydride (H-) in NaBH4 is replaced with deuteride (D-), allowing the deuterium to be incorporated into the molecule.
Step 3: Perform the reduction reaction. The NaBD4 will donate a deuterium atom to the carbonyl carbon of butan-2-one, converting the C=O bond into a C-D bond and forming a secondary alcohol.
Step 4: After the reduction, the product will be labeled as CH3CH(OD)CH2CH3. To ensure the hydroxyl group (-OH) is not exchanged with hydrogen, the reaction should be carried out in D2O (deuterium oxide) as the solvent.
Step 5: The final labeled compound is CH3CH(OH)CH2CH3, where the deuterium atom is attached to the carbon that was originally part of the carbonyl group in butan-2-one.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Reduction Reactions
Reduction reactions involve the gain of electrons or hydrogen, or the loss of oxygen. In organic chemistry, reducing agents like NaBH4 (sodium borohydride) are commonly used to convert carbonyl compounds, such as ketones and aldehydes, into alcohols. Understanding how these reactions work is crucial for synthesizing compounds from starting materials like butan-2-one.
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Deuteration
Deuteration is the process of replacing hydrogen atoms in a molecule with deuterium, a heavier isotope of hydrogen. This is significant in organic synthesis when using NaBD4, which introduces deuterium into the product. Recognizing how deuteration affects molecular structure and properties is essential for synthesizing labeled compounds.
NMR Spectroscopy
Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful analytical technique used to determine the structure of organic compounds. It provides information about the number and environment of hydrogen atoms in a molecule. Understanding NMR is important for analyzing the products of the synthesis and confirming the incorporation of deuterium in the labeled compounds.
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Related Practice
Textbook Question
Show how you would accomplish the following syntheses.
(a) benzene → n-butylbenzene
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Textbook Question
Show how you would synthesize octanal from each compound. You may use any necessary reagents.
(f) octanoic acid
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Textbook Question
The Wittig reaction is useful for placing double bonds in less stable positions. For example, the following transformation is easily accomplished using a Wittig reaction.
(a) Show how you would use a Wittig reaction to do this.
(b) Show how you might do this without using a Wittig reaction, and then explain why the Wittig reaction is a much better synthesis.
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Textbook Question
When LiAlH4 reduces 3-methylcyclopentanone, the product mixture contains 60% cis-3-methylcyclopentanol and 40% trans-3-methylcyclopentanol. Use your models, and make three-dimensional drawings to explain this preference for the cis isomer.
Textbook Question
Show how you would synthesize octanal from each compound. You may use any necessary reagents.
(e) 1-bromohexane
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