Textbook Question
Rationalize the ranking of increasing reaction rate of the benzylic halides shown.
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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 57a
Mullins 1st EditionCh. 24 - Benzene II: Reactions Influenced by the Aromatic RingProblem 57aChapter 23, Problem 57a
Phenol oxidation can be coupled with other reactions to form new C―C bonds using reactions studied previously. Predict the product of the following series of reactions.
(a) 
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Identify the starting material as hydroquinone, which is a benzene ring with two hydroxyl groups (OH) in the para position.
Recognize that the first reagent, H₂CrO₄ (chromic acid), is a strong oxidizing agent. It will oxidize the hydroquinone to para-benzoquinone, converting the hydroxyl groups to carbonyl groups (C=O).
Understand that the second step involves the reaction of para-benzoquinone with cyclopentadiene in the presence of heat. This is a Diels-Alder reaction, where the diene (cyclopentadiene) reacts with the dienophile (para-benzoquinone).
In the Diels-Alder reaction, the diene and dienophile form a new six-membered ring. The reaction will result in the formation of a bicyclic compound, where the cyclopentadiene adds across the double bonds of the quinone.
Consider the stereochemistry and regiochemistry of the Diels-Alder reaction, which typically proceeds with endo selectivity, meaning the newly formed bridge will be oriented towards the electron-withdrawing groups of the dienophile.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Phenol Structure and Reactivity
Phenol is an aromatic compound with a hydroxyl (-OH) group attached to a benzene ring. Its structure allows for unique reactivity, particularly in electrophilic aromatic substitution and oxidation reactions. Understanding how the hydroxyl group influences the electron density of the aromatic ring is crucial for predicting the outcomes of reactions involving phenol.
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Identify the most acidic phenol
Oxidation Reactions
Oxidation reactions involve the loss of electrons or an increase in oxidation state, often resulting in the formation of new functional groups. In the context of phenol, oxidation can lead to the formation of quinones, which are highly reactive and can participate in further reactions, including coupling with other substrates to form new carbon-carbon bonds.
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C―C Bond Formation
C―C bond formation is a fundamental aspect of organic synthesis, allowing for the construction of complex molecules. Various methods, such as cross-coupling reactions, can be employed to create these bonds. Understanding the mechanisms and conditions under which these reactions occur is essential for predicting the products of reactions involving phenol and its oxidized derivatives.
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Related Practice
Textbook Question
Lawsone, found in the extract of henna, reacts with amino acid residues to give the characteristic color associated with henna tattoos. Suggest a mechanism for the reaction shown.
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Textbook Question
Identify the aromatic product that would result from the oxidation of the triol with an excess of PCC.
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Textbook Question
Phenol oxidation can be coupled with other reactions to form new C―C bonds using reactions studied previously. Predict the product of the following series of reactions.
(b)
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Textbook Question
Provide the reagents necessary to carry out the following synthesis. What is the purpose of steps (a) and (e)?
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Textbook Question
In light of your answers to Assessments 24.54 and 24.55, rank the following based on the rate of protonation of the alkene (1 = most basic, 6 = least basic). [Ignore the fact that the alkene may not be the most basic site in the molecule.]
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