Domanda del libro di testo
Draw all possible resonance structures for the reactive intermediates shown.
(c)
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Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions
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. 21 - Conjugated Systems 1: Stability and Addition ReactionsProblema 4
Mullins 1st EditionCh. 21 - Conjugated Systems 1: Stability and Addition ReactionsProblema 4Capitolo 20, Problema 4
Rank the following alkenes in order of stability (1 = most stable; 5 = least stable). Explain your order. 
Guida verificata passo dopo passo1
Step 1: Understand the concept of alkene stability. Alkene stability is influenced by the degree of substitution of the double bond. More substituted alkenes are generally more stable due to hyperconjugation and inductive effects.
Step 2: Analyze the structures provided. Count the number of alkyl groups attached to the carbon atoms of the double bond in each alkene. These groups contribute to the substitution level of the double bond.
Step 3: Rank the alkenes based on substitution. For example, a tetrasubstituted alkene (four alkyl groups attached to the double bond) is more stable than a trisubstituted alkene, which is more stable than a disubstituted alkene, and so on.
Step 4: Consider additional factors such as steric hindrance and conjugation. Conjugation with adjacent π systems (like benzene rings or other double bonds) can increase stability, while steric hindrance can decrease it.
Step 5: Assign the stability ranking based on the above analysis. The alkene with the highest substitution and favorable conjugation will be ranked as the most stable (1), and the alkene with the lowest substitution or unfavorable steric effects will be ranked as the least stable (5).
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Alkene Stability
The stability of alkenes is primarily influenced by the degree of substitution at the double bond. More substituted alkenes (those with more alkyl groups attached to the carbon atoms of the double bond) are generally more stable due to hyperconjugation and the inductive effect, which help to stabilize the double bond. Therefore, the order of stability typically follows the trend: tetrasubstituted > trisubstituted > disubstituted > monosubstituted > unsubstituted.
Video consigliato:
04:28
Understanding trends of alkene stability.
Hyperconjugation
Hyperconjugation is a stabilizing interaction that occurs when the electrons in a sigma bond (usually C-H or C-C) interact with an adjacent empty or partially filled p-orbital or a pi-bond. In alkenes, this effect is particularly significant in more substituted alkenes, where the presence of additional alkyl groups allows for greater overlap and stabilization of the double bond, thus enhancing the overall stability of the alkene.
Video consigliato:
04:28Understanding trends of alkene stability.
Inductive Effect
The inductive effect refers to the electron-donating or withdrawing effects of substituents through sigma bonds. Alkyl groups are electron-donating, which can help stabilize the positive charge that may develop in the transition state of reactions involving alkenes. This effect contributes to the increased stability of more substituted alkenes, as the electron-donating nature of the substituents reduces the overall electron deficiency at the double bond.
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01:47Understanding the Inductive Effect.
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