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.
1080
views
Ch. 8 - Alkenes 1: Properties and Electrophilic Additions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
Non è quello che usi tu?Cambia libro di testoScegli un libro di testo diverso
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
Tutti i libri di testo
Mullins 1st EditionCh. 8 - Alkenes 1: Properties and Electrophilic AdditionsProblema 68a
Mullins 1st EditionCh. 8 - Alkenes 1: Properties and Electrophilic AdditionsProblema 68aCapitolo 7, Problema 68a
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.]
(a) 
Guida verificata passo dopo passo1
Step 1: Protonation of the less stable alkene - The reaction begins with the sulfuric acid (H₂SO₄) donating a proton (H⁺) to the double bond of the less stable alkene. This forms a carbocation intermediate. The protonation occurs at the less substituted carbon of the double bond, following Markovnikov's rule.
Step 2: Carbocation rearrangement - The carbocation formed in Step 1 undergoes rearrangement to form a more stable carbocation. This stability is achieved through hydride or alkyl shifts, ensuring the positive charge is located on the most substituted carbon (tertiary carbocation is more stable than secondary or primary).
Step 3: Deprotonation to form a new double bond - A base (often the bisulfate ion, HSO₄⁻, from sulfuric acid) abstracts a proton from a β-hydrogen adjacent to the carbocation. This results in the formation of a new double bond, yielding the more stable alkene isomer.
Step 4: Principle of microscopic reversibility - The reaction mechanism illustrates the principle of microscopic reversibility, where the forward and reverse reactions follow the same pathway. The acid-catalyzed isomerization ensures the equilibrium favors the formation of the more thermodynamically stable alkene.
Step 5: Final product - The more stable alkene is formed as the major product due to the thermodynamic preference for the more substituted double bond. This is evident in the provided reaction, where the initial alkene is isomerized to a more substituted and stable alkene structure.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
4mConcetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Acid-Catalyzed Isomerization
Acid-catalyzed isomerization involves the rearrangement of molecular structures under acidic conditions, typically facilitated by protonation of a double bond. This process allows less stable alkenes to convert into more stable isomers by overcoming energy barriers through the formation of carbocation intermediates. The presence of sulfuric acid provides protons that enhance the reactivity of the alkene, enabling the isomerization to occur.
Video consigliato:
03:09
Acid Catalyzed
Microscopic Reversibility
Microscopic reversibility is a principle stating that the mechanism of a reaction can be reversed at the molecular level. In the context of acid-catalyzed isomerization, this means that the steps leading to the formation of a more stable isomer can also be followed in reverse to regenerate the original alkene. This concept emphasizes the symmetry in chemical reactions, where the forward and reverse pathways share similar transition states.
Video consigliato:
07:37Properties and Types of Pericyclic Reactions
Carbocation Stability
Carbocation stability is a key factor in determining the outcome of reactions involving alkenes. Carbocations are positively charged intermediates that can vary in stability based on their structure; tertiary carbocations are more stable than secondary or primary ones due to hyperconjugation and inductive effects. Understanding the stability of carbocations is crucial for predicting the favored isomerization pathway and the final product in acid-catalyzed reactions.
Video consigliato:
05:58Determining Carbocation Stability
Pratica correlata
Domanda del libro di testo
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)
795
views
Domanda del libro di testo
How many stereoisomers are possible for the following alkenes?
(c)
1201
views
Domanda del libro di testo
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.]
(c)
106
views
Domanda del libro di testo
How many stereoisomers are possible for the following alkenes?
(d)
1261
views
Domanda del libro di testo
If you react carvone with a single equivalent of HBr, only one product is produced, even though carvone has two carbon–carbon double bonds. Explain this observation.
1488
views