Domanda del libro di testo
Three arene oxides can be obtained from phenanthrene.
a. Draw the structures of the three phenanthrene oxides.
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Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds
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
Tutti i libri di testo
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblema 39
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblema 39Capitolo 10, Problema 39
Explain why the two arene oxides in [PROBLEM 10-38] open in opposite directions.
Guida verificata passo dopo passo1
Step 1: Analyze the structures of the arene oxides in Reaction (i) and Reaction (ii). Both are epoxides derived from aromatic rings, but they differ in their substituents. In Reaction (i), the substituent is a positively charged nitrogen group, while in Reaction (ii), the substituent is an ethoxy group (-OCH2CH3).
Step 2: Understand the mechanism of epoxide ring opening. Epoxide rings are strained and prone to nucleophilic attack. The direction of ring opening depends on electronic and steric factors. In Reaction (i), the positively charged nitrogen group is electron-withdrawing, creating an electron-deficient site on the aromatic ring. In Reaction (ii), the ethoxy group is electron-donating, influencing the electron density differently.
Step 3: Consider the regioselectivity of the nucleophilic attack. In Reaction (i), the water molecule attacks the carbon adjacent to the positively charged nitrogen group because this position is more electrophilic due to the electron-withdrawing effect of the nitrogen group. In Reaction (ii), the water molecule attacks the carbon adjacent to the ethoxy group because the electron-donating nature of the ethoxy group stabilizes the positive charge formed during the ring opening.
Step 4: Examine steric effects. In Reaction (i), the bulky nitrogen group may also influence the direction of ring opening by sterically hindering attack on certain positions. In Reaction (ii), the ethoxy group is less bulky, allowing for a different regioselectivity in the attack.
Step 5: Summarize the reasoning. The two arene oxides open in opposite directions due to the electronic effects (electron-withdrawing vs. electron-donating) and steric effects of their substituents, which dictate the regioselectivity of the nucleophilic attack during the ring-opening process.
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Arene Oxides
Arene oxides are reactive intermediates formed from the oxidation of aromatic compounds. They contain an epoxide structure, where an oxygen atom is incorporated into the aromatic ring, creating a three-membered cyclic ether. Their reactivity is significant in organic chemistry, particularly in electrophilic reactions, where they can undergo nucleophilic attack, leading to various products.
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03:20
Benzylic Oxidation
Regioselectivity
Regioselectivity refers to the preference of a chemical reaction to occur at one location over another in a molecule. In the context of arene oxides, the direction in which the oxides open can be influenced by the electronic and steric effects of substituents on the aromatic ring. This concept is crucial for understanding why different arene oxides can yield products that differ in their structural orientation.
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05:09Heck Reaction
Nucleophilic Attack
Nucleophilic attack is a fundamental reaction mechanism in organic chemistry where a nucleophile donates an electron pair to an electrophile, forming a chemical bond. In the case of arene oxides, water acts as a nucleophile that attacks the electrophilic carbon in the epoxide, leading to the opening of the ring. The orientation of this attack can determine the final product's structure, explaining the observed differences in the reactions shown.
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08:27Nucleophilic Addition
Pratica correlata
Domanda del libro di testo
Three arene oxides can be obtained from phenanthrene.
d. Which of the three phenanthrene oxides is most likely to be carcinogenic?
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Domanda del libro di testo
How do the major products obtained from rearrangement of the following arene oxides differ?
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Domanda del libro di testo
The existence of the NIH shift was established by determining the major product obtained from rearrangement of the following arene oxide, in which a hydrogen has been replaced by a deuterium.
a. What would be the major product if the NIH shift occurs? (Hint: A C—H bond is easier to break than a C—D bond.)
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Domanda del libro di testo
The existence of the NIH shift was established by determining the major product obtained from rearrangement of the following arene oxide, in which a hydrogen has been replaced by a deuterium.
b. What would be the major product if the carbocation forms phenol by losing H+ or D+, rather than by going through the NIH shift?
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Domanda del libro di testo
Three arene oxides can be obtained from phenanthrene.
c. If a phenanthrene oxide can lead to the formation of more than one phenol, which phenol will be obtained in greater yield?
1148
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