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 55a
Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
(a) heptanal
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.
Examine the starting material (heptanal). Heptanal is an aldehyde with a seven-carbon chain. To synthesize octan-2-one, you need to add one carbon to the chain and convert the aldehyde into a ketone.
Add one carbon to the chain by performing a Grignard reaction. React heptanal with methylmagnesium bromide (CH₃MgBr) to form a secondary alcohol. This reaction involves nucleophilic addition of the methyl group to the carbonyl carbon of heptanal.
Oxidize the secondary alcohol formed in the previous step to a ketone. Use an oxidizing agent such as PCC (pyridinium chlorochromate) or Jones reagent (CrO₃/H₂SO₄) to achieve this transformation.
Verify the structure of the product to ensure it matches octan-2-one. The carbonyl group should now be on the second carbon of the eight-carbon chain, completing the synthesis.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Aldol Condensation
Aldol condensation is a reaction between aldehydes or ketones that contain alpha-hydrogens, leading to the formation of β-hydroxy aldehydes or ketones. This reaction is crucial for synthesizing larger carbon chains, as it allows for the formation of new carbon-carbon bonds. In the case of heptanal, an aldol condensation can be performed to create a compound that can be further transformed into octan-2-one.
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Crossed Aldol
Reduction Reactions
Reduction reactions involve the gain of electrons or hydrogen, or the loss of oxygen, resulting in the conversion of carbonyl compounds into alcohols or other functional groups. In synthesizing octan-2-one from heptanal, reduction can be employed to convert an intermediate compound into the desired ketone. Common reducing agents include lithium aluminum hydride (LiAlH4) or sodium borohydride (NaBH4).
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Rearrangement Reactions
Rearrangement reactions involve the structural reorganization of a molecule, often leading to the formation of more stable or functionalized products. In the synthesis of octan-2-one from heptanal, a rearrangement may be necessary to shift the position of the carbonyl group or to create the desired ketone structure. This concept is essential for understanding how to manipulate molecular structures during synthesis.
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Related Practice
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Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagents.
(d) excess ethanol and acid
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Textbook Question
Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
(b) oct-1-yne
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Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagents.
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Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagents.
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Textbook Question
Show how you would synthesize octan-2-one from each compound. You may use any necessary reagents.
(c) 2,3-dimethylnon-2-ene
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