Domanda del libro di testo
Show a mechanism for the following elimination reactions. Label the mechanism as E1 or E2.
(c)
680
views
Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes
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. 12 - Substitution and Elimination: Reactions of HaloalkanesProblema 42d
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblema 42dCapitolo 11, Problema 42d
Show a mechanism for the following elimination reactions. Label the mechanism as E1 or E2.
(d) 
Guida verificata passo dopo passo1
Step 1: Identify the type of elimination mechanism. The reaction involves NaNH₂, a strong base, and THF as the solvent. This suggests an E2 elimination mechanism, as E2 typically occurs with strong bases and does not involve a carbocation intermediate.
Step 2: Analyze the substrate. The substrate contains a chlorine atom attached to a carbon adjacent to a β-hydrogen. The β-hydrogen is necessary for elimination to occur, as it will be abstracted by the base.
Step 3: Describe the E2 mechanism. In an E2 reaction, the strong base (NaNH₂) abstracts the β-hydrogen, and simultaneously, the leaving group (Cl) departs. This results in the formation of a double bond between the α and β carbons.
Step 4: Consider stereochemistry. The E2 mechanism requires the β-hydrogen and the leaving group to be anti-periplanar (in opposite planes). Ensure the molecular geometry allows for this arrangement before elimination occurs.
Step 5: Draw the product. After the elimination, the product is a conjugated diene with a double bond formed between the α and β carbons. The oxygen atom in the furan ring remains unaffected during the reaction.
Risposta video verificata per un problema simile:
Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Concetti chiave
Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.
Elimination Reactions
Elimination reactions involve the removal of a leaving group and a hydrogen atom from adjacent carbon atoms, resulting in the formation of a double bond. These reactions can be classified as either E1 or E2, depending on the mechanism. E1 reactions are unimolecular and proceed through a carbocation intermediate, while E2 reactions are bimolecular and involve a concerted mechanism where the bond formation and bond breaking occur simultaneously.
Video consigliato:
00:40
Recognizing Elimination Reactions.
E1 vs. E2 Mechanisms
The E1 mechanism is characterized by two steps: first, the formation of a carbocation after the leaving group departs, followed by deprotonation to form the double bond. In contrast, the E2 mechanism occurs in a single step where the base abstracts a proton while the leaving group exits, leading to the formation of the double bond. The choice between E1 and E2 depends on factors such as substrate structure, the strength of the base, and the reaction conditions.
Video consigliato:
09:36Drawing the E2 Mechanism.
Role of Sodium Amide (NaNH2)
Sodium amide (NaNH2) is a strong base commonly used in elimination reactions. It facilitates the removal of protons from the substrate, promoting the formation of double bonds in E2 mechanisms. In the context of the provided reaction, NaNH2 acts to deprotonate the substrate after the leaving group (Cl) departs, leading to the formation of the alkene product. Its strength as a base is crucial for driving the elimination process.
Video consigliato:
01:33Amide Nomenclature
Pratica correlata
Domanda del libro di testo
Suggest an appropriate base to synthesize the alkene as the major product from the starting haloalkane.
(a)
1095
views
Domanda del libro di testo
Given the reactants shown, what type of elimination would you expect to occur?
(d)
1305
views
Domanda del libro di testo
Suggest an appropriate base to synthesize the alkene as the major product from the starting haloalkane.
(b)
810
views
Domanda del libro di testo
Show a mechanism for the following elimination reactions. Label the mechanism as E1 or E2.
(a)
1462
views
Domanda del libro di testo
Paying close attention to the stereochemical outcome, predict the product of these elimination reactions.
(a)
1290
views