Domanda del libro di testo
Given the reactants shown, what type of elimination would you expect to occur?
(a)
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Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes
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. 12 - Substitution and Elimination: Reactions of HaloalkanesProblema 39c
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblema 39cCapitolo 11, Problema 39c
Would you expect the following bases to favor E1 or E2 elimination?
(c) 
Guida verificata passo dopo passo1
Step 1: Begin by identifying the base shown in the image. The base is sodium tert-butoxide (NaO-tBu), which is a strong and bulky base.
Step 2: Recall the characteristics of E1 and E2 elimination mechanisms. E1 elimination involves a carbocation intermediate and is typically favored by weak bases and polar protic solvents. E2 elimination is a concerted mechanism that requires a strong base and is influenced by steric hindrance.
Step 3: Analyze the steric hindrance of the base. Sodium tert-butoxide is a bulky base, meaning it has difficulty approaching the β-hydrogen in crowded environments. This steric hindrance makes it more likely to favor E2 elimination over E1.
Step 4: Consider the solvent and substrate. E2 elimination is favored in polar aprotic solvents and with substrates that have accessible β-hydrogens. The bulky nature of the base may also lead to preferential elimination of less sterically hindered β-hydrogens.
Step 5: Conclude that sodium tert-butoxide, due to its strong and bulky nature, will favor the E2 elimination mechanism over E1. The steric hindrance of the base plays a key role in this preference.
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E1 and E2 Mechanisms
E1 (unimolecular elimination) and E2 (bimolecular elimination) are two types of elimination reactions in organic chemistry. E1 involves a two-step mechanism where the leaving group departs first, forming a carbocation, followed by deprotonation. In contrast, E2 is a one-step mechanism where the base abstracts a proton while the leaving group exits simultaneously, requiring a strong base and often leading to more sterically hindered substrates.
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09:36
Drawing the E2 Mechanism.
Substrate Structure
The structure of the substrate plays a crucial role in determining whether E1 or E2 mechanisms are favored. E1 reactions are more favorable with tertiary substrates due to the stability of the carbocation formed, while E2 reactions can occur with primary, secondary, or tertiary substrates, depending on the strength of the base and steric hindrance. Understanding the substrate's structure helps predict the reaction pathway.
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03:04Drawing Resonance Structures
Base Strength and Sterics
The strength and steric properties of the base influence the choice between E1 and E2 mechanisms. Strong bases favor E2 eliminations as they can effectively abstract protons in a concerted manner. Conversely, weak bases or neutral conditions may lead to E1 eliminations, especially when the substrate can stabilize a carbocation. The steric hindrance of the base also affects its ability to approach the substrate for E2 reactions.
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02:53Understanding steric effects.
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