Domanda del libro di testo
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(c)
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Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases/Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 17 - Carbonyl Addition Reactions: Aldehydes and KetonesProblema 70
Mullins 1st EditionCh. 17 - Carbonyl Addition Reactions: Aldehydes and KetonesProblema 70Capitolo 16, Problema 70
When a ketone is dissolved in 18O-labeled water, the 18O label is incorporated into the ketone. Suggest a mechanism that explains this observation.
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Identify the ketone structure and the labeled water. The ketone has a carbonyl group (C=O), and the labeled water is H2^18O, where the oxygen is the isotope ^18O.
Understand that the mechanism involves the exchange of the oxygen atom in the carbonyl group with the labeled oxygen from water. This typically occurs through a reversible reaction.
Propose the first step of the mechanism: the nucleophilic attack of the water molecule on the electrophilic carbon of the carbonyl group. This forms a tetrahedral intermediate.
In the next step, the intermediate collapses, leading to the expulsion of the original oxygen atom as a hydroxide ion (OH^-), and the incorporation of the ^18O from the water into the carbonyl group.
Finally, the hydroxide ion can abstract a proton from the newly formed hydroxyl group, regenerating the ketone structure with the ^18O incorporated into the carbonyl group, completing the exchange process.
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Ketone Structure and Reactivity
Ketones are carbonyl compounds characterized by a carbon atom double-bonded to an oxygen atom (C=O) with two alkyl or aryl groups attached. The carbonyl carbon is electrophilic, making it susceptible to nucleophilic attack. This reactivity is crucial for understanding how ketones can undergo reactions that incorporate isotopic labels, such as the exchange of oxygen atoms in the presence of labeled water.
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Name the ketone
Isotopic Labeling
Isotopic labeling involves replacing an atom in a molecule with its isotope, such as replacing regular oxygen (16O) with its heavier isotope (18O). This technique is used to trace the path of atoms through a chemical reaction. In the context of the question, 18O-labeled water is used to track the incorporation of the oxygen isotope into the ketone, providing insights into the reaction mechanism.
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03:06Understanding the hydrogen isotopes.
Nucleophilic Addition-Elimination Mechanism
The nucleophilic addition-elimination mechanism involves a nucleophile attacking an electrophilic carbon, forming a tetrahedral intermediate, followed by the elimination of a leaving group. In the case of ketones reacting with water, the water molecule acts as a nucleophile, attacking the carbonyl carbon, leading to the incorporation of the 18O label into the ketone through a reversible hydration-dehydration process.
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08:27Nucleophilic Addition
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We show in Chapter 20 that α , β-unsaturated ketones are electrophilic at C4. Rationalize this observation.
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Domanda del libro di testo
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(d)
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As discussed in Section 17.9.1, alkenes can be hydrogenated selectively in the presence of ketones. Suppose that was not the case, and suggest how you might use a protecting group strategy to generate A from B.
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