Domanda del libro di testo
Use oxidation numbers to determine whether the following are redox reactions.
(a)
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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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TOC.tableOfContents
- 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 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: 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 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: 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: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblema 5a
Mullins 1st EditionCh. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblema 5aCapitolo 12, Problema 5a
The mechanism of the acid-catalyzed hydration of an alkene to make an alcohol is shown. If this reaction is reversible, draw a mechanism that justifies formation of the alkene from the alcohol under similar conditions. How do you know this mechanism is correct?
Guida verificata passo dopo passo1
Step 1: Recognize that the reverse reaction involves the conversion of the alcohol back into the alkene. This is achieved through an acid-catalyzed dehydration mechanism, which is the reverse of the hydration mechanism shown in the image.
Step 2: Protonate the alcohol group using an acid (H₃O⁺). The lone pair of electrons on the oxygen atom of the alcohol will attack the hydrogen of H₃O⁺, forming a positively charged oxonium ion (R-OH₂⁺). This step increases the leaving group ability of the hydroxyl group.
Step 3: Eliminate water (H₂O) from the oxonium ion to form a carbocation intermediate. The bond between the oxygen and the carbon breaks, releasing a neutral water molecule and leaving behind a positively charged carbocation.
Step 4: Rearrange the carbocation if necessary to form the most stable carbocation (e.g., tertiary carbocation is more stable than secondary or primary). This step is crucial for regioselectivity in the reaction.
Step 5: Deprotonate the carbocation to form the alkene. A base (such as water or another molecule) will abstract a proton from a β-hydrogen adjacent to the carbocation, resulting in the formation of a double bond and regenerating the acid catalyst (H₃O⁺).
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Acid-Catalyzed Hydration
Acid-catalyzed hydration is a reaction where an alkene reacts with water in the presence of an acid to form an alcohol. The acid donates a proton to the alkene, creating a carbocation intermediate, which is then attacked by water. This mechanism is crucial for understanding how alkenes can be converted to alcohols and vice versa.
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06:34
Acid-catalyzed hydration mechanism
Reversibility of Reactions
Many organic reactions, including acid-catalyzed hydration, are reversible. This means that the products can revert to the original reactants under certain conditions. Understanding the equilibrium between the alcohol and alkene is essential for drawing the reverse mechanism, which involves the removal of water and the reformation of the alkene.
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11:50EAS Reactions Overview
Mechanistic Justification
Mechanistic justification involves providing a detailed step-by-step explanation of how reactants are converted into products. In the context of the reverse reaction, this includes showing how the alcohol loses a water molecule to regenerate the alkene. This justification is supported by the stability of intermediates and the energy changes throughout the reaction pathway.
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Percorso guidato
0:40Alkene Metathesis Concept 3
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