Textbook Question
Predict the product of the following substitution/addition reactions involving phenoxides.
(a)
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Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- 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 I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: 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 I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: 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: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 24 - Benzene II: Reactions Influenced by the Aromatic RingProblem 22
Mullins 1st EditionCh. 24 - Benzene II: Reactions Influenced by the Aromatic RingProblem 22Chapter 23, Problem 22
(a) Based on Figure 24.23, explain why meta-dihydroxybenzene is not oxidized to meta-quinone.
(b) If a meta-quinone is not produced, what would you expect the product of the oxidation of meta-dihydroxybenzene to be?
Verified step by step guidance1
Step 1: Analyze the structure of meta-dihydroxybenzene. It consists of a benzene ring with two hydroxyl groups attached at the meta positions (1,3-positions).
Step 2: Understand the typical oxidation process for dihydroxybenzenes. In ortho and para positions, oxidation can lead to quinones, which are cyclic diketones.
Step 3: Consider the electronic effects in meta-dihydroxybenzene. The hydroxyl groups at meta positions do not facilitate the formation of a conjugated system necessary for quinone formation, unlike ortho or para positions.
Step 4: Recognize that the lack of conjugation in meta-dihydroxybenzene prevents the stabilization of a quinone structure, hence it is not oxidized to meta-quinone.
Step 5: Predict the alternative oxidation product. Without forming a quinone, the oxidation of meta-dihydroxybenzene might lead to other products such as carboxylic acids or other oxidized forms, which will be explored in further assessments.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Dihydroxybenzene Structure
Dihydroxybenzene, also known as catechol, has two hydroxyl (-OH) groups attached to a benzene ring. The position of these groups significantly affects the compound's reactivity. In meta-dihydroxybenzene, the hydroxyl groups are located at the 1,3-positions, which influences the stability of potential oxidation products and their ability to form resonance structures.
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Drawing Resonance Structures
Oxidation Mechanism
Oxidation in organic chemistry often involves the loss of electrons or the addition of oxygen. In the case of meta-dihydroxybenzene, the oxidation process may not favor the formation of meta-quinone due to steric hindrance and the electronic effects of the hydroxyl groups, which can stabilize the starting material and prevent the formation of certain products.
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Resonance and Stability
Resonance refers to the delocalization of electrons within a molecule, which can stabilize certain structures. In meta-dihydroxybenzene, the arrangement of hydroxyl groups does not allow for effective resonance stabilization of a meta-quinone structure. This lack of stabilization can lead to alternative oxidation products, which may be more favorable than the formation of a quinone.
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Related Practice
Textbook Question
Assessment 24.22 asked why meta-dihydroxybenzene could not be oxidized to meta-quinone. The attempted oxidation instead gives rise to three different quinone products. Suggest a mechanism for the formation of each.
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Textbook Question
Oxidation of a phenol derivative produces the lactone shown. Provide an arrow-pushing mechanism that rationalizes this outcome.
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Textbook Question
In light of Figure 24.22, provide a mechanism by which para-dihydroxybenzene is oxidized to para-quinone.
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Textbook Question
Predict the product of the following substitution/addition reactions involving phenoxides. [Because this problem represents a review of current and previous material, section numbers have been provided for your reference.]
(d)
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