Domanda del libro di testo
Show how each of the following compounds could be prepared from the given starting material. Each requires a protecting group.
b.
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Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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TOC.tableOfContents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding31
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds: Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblema 43
Bruice 8th EditionCh. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid DerivativesProblema 43Capitolo 16, Problema 43
Explain why acetals do not react with nucleophiles.
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Acetals are compounds that contain two alkoxy groups (-OR) attached to the same carbon atom, which is also bonded to a hydrogen atom or another carbon atom. This structure makes acetals relatively stable under neutral or basic conditions.
The carbon atom in an acetal is fully saturated (sp³ hybridized) and does not possess a partial positive charge. This is because the electron-donating alkoxy groups stabilize the carbon atom, reducing its electrophilicity.
Nucleophiles are species that donate electron pairs to electrophilic centers. Since the carbon atom in an acetal is not electrophilic, it does not attract nucleophiles effectively.
Additionally, acetals are stable under basic conditions and do not undergo hydrolysis or other reactions unless exposed to acidic conditions. Acidic conditions can protonate one of the alkoxy groups, making the carbon atom more electrophilic and susceptible to nucleophilic attack.
In summary, acetals do not react with nucleophiles because their carbon atom is not electrophilic due to the electron-donating effects of the alkoxy groups, and they are stable under neutral or basic conditions.
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Acetal Structure
Acetals are formed from the reaction of an aldehyde or ketone with an alcohol in the presence of an acid catalyst. They consist of a carbon atom bonded to two alkoxy groups (–OR) and a hydrogen atom or another carbon atom. This structure stabilizes the carbon atom, making it less electrophilic and less susceptible to nucleophilic attack.
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04:29
Acetal Protecting Group
Nucleophilicity
Nucleophiles are species that donate an electron pair to form a chemical bond. They are typically attracted to positively charged or electron-deficient centers. In the case of acetals, the carbon atom is not electron-deficient due to the presence of the two electron-donating alkoxy groups, which reduces its reactivity towards nucleophiles.
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08:27Nucleophilic Addition
Stability of Acetals
Acetals are generally stable under neutral or basic conditions and do not readily undergo hydrolysis or react with nucleophiles. This stability arises from the strong C–O bonds in the acetal structure and the steric hindrance provided by the bulky alkoxy groups, which further protect the carbon center from nucleophilic attack.
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04:29Acetal Protecting Group
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