Domanda del libro di testo
Because of the angle strain present in cyclopropanes, they tend to open up in the presence of nearby radicals. Show a mechanism for the following reaction that demonstrates this principle.
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Ch. 8 - Alkenes 1: Properties and Electrophilic Additions
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. 8 - Alkenes 1: Properties and Electrophilic AdditionsProblema 68b
Mullins 1st EditionCh. 8 - Alkenes 1: Properties and Electrophilic AdditionsProblema 68bCapitolo 7, Problema 68b
When using sulfuric acid, but in the absence of other nucleophiles like water or bromide ion, less stable alkenes can be isomerized to their more stable isomer. Provide a mechanism for these acid-catalyzed isomerization reactions. [This is one illustration of the principle of microscopic reversibility.]
(b) 
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Step 1: Protonation of the less stable alkene occurs when sulfuric acid (H₂SO₄) donates a proton (H⁺) to the double bond. This forms a carbocation intermediate. The position of the carbocation depends on the stability of the intermediate formed.
Step 2: The carbocation undergoes rearrangement if necessary to form a more stable carbocation. This rearrangement can involve hydride shifts or alkyl group migrations to stabilize the positive charge.
Step 3: Deprotonation occurs at a different position, leading to the formation of a new double bond. This step regenerates the sulfuric acid catalyst and results in the isomerization of the alkene.
Step 4: The principle of microscopic reversibility ensures that the mechanism for the forward reaction (isomerization) is the reverse of the mechanism for the backward reaction. This means the same intermediates are involved in both directions.
Step 5: The final product is the more stable alkene, which is determined by factors such as hyperconjugation and the degree of substitution of the double bond. In this case, the double bond shifts to a position that results in a more substituted and stable alkene.
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Acid-Catalyzed Isomerization
Acid-catalyzed isomerization involves the rearrangement of molecular structures under acidic conditions, typically facilitated by a protonation step. In this process, the acid donates a proton to the alkene, creating a more reactive carbocation intermediate. This intermediate can then undergo structural rearrangement to form a more stable isomer, often resulting in a shift from less stable to more stable alkene configurations.
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Acid Catalyzed
Microscopic Reversibility
Microscopic reversibility is a principle stating that the mechanism of a reaction can be reversed at the molecular level. This means that the steps leading to the formation of products can be retraced to regenerate the reactants. In the context of acid-catalyzed isomerization, this principle implies that the pathway taken to convert one isomer to another can also be followed in reverse, allowing for the interconversion of isomers under the right conditions.
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07:37Properties and Types of Pericyclic Reactions
Carbocation Stability
Carbocation stability is a key concept in organic chemistry that refers to the relative stability of positively charged carbon species. The stability of a carbocation is influenced by factors such as the degree of substitution (primary, secondary, tertiary) and resonance effects. More stable carbocations are favored during reactions, as they lower the energy barrier for the reaction pathway, making it easier for isomerization to occur.
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05:58Determining Carbocation Stability
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