Textbook Question
Draw a mechanism for the following oxidation reactions.
(b)
6
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Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination
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. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblem 100b(ii)
Mullins 1st EditionCh. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblem 100b(ii)Chapter 12, Problem 100b(ii)
Draw the mechanism for the acid-catalyzed pinacol rearrangement of the following diols.
(b) 
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Identify the diol structure that will undergo the pinacol rearrangement. Pinacol rearrangement typically involves vicinal diols, which are diols with hydroxyl groups on adjacent carbon atoms.
Protonate one of the hydroxyl groups using an acid catalyst. This step increases the electrophilicity of the hydroxyl group, making it a better leaving group.
Form a carbocation by eliminating a water molecule from the protonated hydroxyl group. This step is crucial as it sets up the rearrangement process.
Rearrange the carbocation through a 1,2-methyl shift. This involves the migration of a methyl group from the adjacent carbon to the carbocation center, stabilizing the carbocation.
Deprotonate the remaining hydroxyl group to form a ketone. This final step involves the loss of a proton from the hydroxyl group, resulting in the formation of a carbonyl group, completing the rearrangement.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Pinacol Rearrangement
Pinacol rearrangement is a chemical reaction where a 1,2-diol undergoes acid-catalyzed dehydration to form a ketone or aldehyde. The reaction involves the migration of an alkyl group and is characterized by the formation of a carbocation intermediate, which facilitates the rearrangement process.
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Definition of Claisen Rearrangement
Carbocation Stability
Carbocation stability is crucial in organic reactions, particularly in rearrangements. Stability is influenced by factors such as hyperconjugation and resonance. In pinacol rearrangement, the formation of a stable carbocation intermediate is essential for the migration of the alkyl group and subsequent rearrangement to occur efficiently.
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Acid Catalysis
Acid catalysis involves the use of an acid to accelerate a chemical reaction. In the pinacol rearrangement, the acid protonates the hydroxyl group of the diol, facilitating the loss of water and formation of a carbocation. This protonation step is critical as it initiates the rearrangement process by making the diol more reactive.
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Related Practice
Textbook Question
Predict the product and draw the mechanism for the acid-catalyzed pinacol rearrangement of the following diols.
(c)
2
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Textbook Question
Predict the product for the acid-catalyzed pinacol rearrangement of the following diols.
(a)
1
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Textbook Question
Draw the mechanism for the acid-catalyzed pinacol rearrangement of the following diols.
(a)
2
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Textbook Question
Predict the product for the acid-catalyzed pinacol rearrangement of the following diols.
(b)
1
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Textbook Question
Draw a mechanism for the following oxidation reactions.
(a)
1
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