Domanda del libro di testo
Show how each transformation may be accomplished by using a nitrile as an intermediate. You may use any necessary reagents.
(c) octan-1-ol → decan-2-one
747
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Ch. 21 - Carboxylic Acid Derivatives
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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TOC.tableOfContents
- 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
Capitolo 21, Problema 40
Propose a mechanism for the reaction of methyl isocyanate with 1-naphthol to give Sevin® insecticide.
Guida verificata passo dopo passo1
Identify the key functional groups in the reactants: Methyl isocyanate (CH3-N=C=O) contains an isocyanate group (-N=C=O), and 1-naphthol contains a hydroxyl group (-OH) attached to a naphthalene ring. These groups are crucial for the reaction mechanism.
Recognize the nucleophile and electrophile: The hydroxyl group (-OH) of 1-naphthol acts as a nucleophile due to the lone pair of electrons on oxygen, while the carbon atom in the isocyanate group (-N=C=O) is electrophilic due to its partial positive charge.
Propose the first step of the mechanism: The nucleophilic oxygen atom of the hydroxyl group attacks the electrophilic carbon atom of the isocyanate group, forming a tetrahedral intermediate. This step involves the formation of a new C-O bond.
Describe the rearrangement: The tetrahedral intermediate undergoes rearrangement, where the nitrogen atom (N) of the isocyanate group facilitates the elimination of the oxygen atom (O) as part of a leaving group, forming a carbamate linkage (-NH-COO-).
Conclude the mechanism: The final product is Sevin® insecticide, which contains a carbamate functional group (-NH-COO-) attached to the naphthalene ring. This structure is stabilized by resonance and is the desired product of the reaction.
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Isocyanate Reactivity
Isocyanates are highly reactive compounds that can undergo nucleophilic addition reactions. In the case of methyl isocyanate, the carbon atom is electrophilic due to the presence of the electron-withdrawing isocyanate group. This reactivity allows isocyanates to react with nucleophiles, such as alcohols or amines, forming stable adducts.
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01:17
Reactivity of Molecules
Nucleophilic Aromatic Substitution
Nucleophilic aromatic substitution (NAS) is a reaction mechanism where a nucleophile replaces a leaving group on an aromatic ring. In this context, 1-naphthol can act as a nucleophile due to its hydroxyl group, which can attack an electrophilic center. This mechanism is crucial for understanding how the reaction proceeds to form the final product, Sevin® insecticide.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Formation of Carbamate
The formation of carbamates involves the reaction of an isocyanate with an alcohol or phenol, resulting in the creation of a carbamate functional group. In the synthesis of Sevin®, the reaction between methyl isocyanate and 1-naphthol leads to the formation of a carbamate, which is a key structural feature of many insecticides. Understanding this transformation is essential for proposing the overall reaction mechanism.
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02:26Formation of Enolates
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