Textbook Question
Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
(e) heptanoic acid
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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 55b
Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
(b) oct-1-yne
Verified step by step guidance1
Identify the target molecule (octan-2-one) and analyze its structure. It is a ketone with the carbonyl group on the second carbon of an eight-carbon chain. The starting material is oct-1-yne, which is an alkyne with a triple bond between the first and second carbons.
Plan the reaction sequence. To convert an alkyne to a ketone, you can use the hydration of the alkyne. This involves adding water across the triple bond in the presence of specific reagents to form a ketone via keto-enol tautomerism.
Use hydroboration-oxidation to achieve the anti-Markovnikov addition of water to the alkyne. However, since the ketone is required on the second carbon (Markovnikov product), the appropriate method is acid-catalyzed hydration using H₂SO₄ (sulfuric acid), H₂O (water), and HgSO₄ (mercuric sulfate) as a catalyst.
Write the reaction mechanism: The alkyne undergoes electrophilic addition of H⁺ (from H₂SO₄), forming a carbocation intermediate. The addition of water (H₂O) leads to the formation of an enol intermediate. This enol tautomerizes to the more stable ketone form, resulting in octan-2-one.
Verify the product: Ensure that the carbonyl group is on the second carbon of the chain, confirming that the reaction sequence has successfully converted oct-1-yne to octan-2-one.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alkyne Reactivity
Alkynes, such as oct-1-yne, are hydrocarbons containing a carbon-carbon triple bond. They are highly reactive and can undergo various reactions, including hydration and hydroboration, to form carbonyl compounds. Understanding the reactivity of alkynes is crucial for synthesizing ketones like octan-2-one, as these reactions can facilitate the transformation of the alkyne into the desired product.
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Alkyne Hydration
Hydration of Alkynes
The hydration of alkynes involves the addition of water across the triple bond, typically in the presence of an acid catalyst. This reaction can yield ketones or aldehydes depending on the structure of the alkyne. For oct-1-yne, the hydration process will lead to the formation of octan-2-one, making it a key step in the synthesis from this compound.
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Reagents for Synthesis
In organic synthesis, specific reagents are employed to facilitate chemical transformations. For synthesizing octan-2-one from oct-1-yne, reagents such as sulfuric acid (H2SO4) for hydration and possibly a catalyst like mercuric sulfate (HgSO4) may be used. Understanding the role of these reagents is essential for successfully carrying out the synthesis and achieving the desired product.
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Related Practice
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Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
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Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
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Textbook Question
Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
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