Domanda del libro di testo
Which is a better leaving group, HO⁻ or H2O? Explain your answer.
1065
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 70
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblema 70Capitolo 11, Problema 70
The following substitution reaction, between a strong base and a 1° haloalkane, occurs in a single step via backside displacement. Yet it is not technically an SN2 reaction. Why?
Guida verificata passo dopo passo1
Understand the mechanism of an Sₙ2 reaction: It is a bimolecular nucleophilic substitution reaction where the nucleophile attacks the electrophilic carbon from the opposite side of the leaving group, resulting in a single-step backside displacement.
Analyze the given reaction: The problem states that the reaction involves a strong base and a 1° haloalkane, and occurs via backside displacement in a single step. This description aligns with the general features of an Sₙ2 reaction.
Consider the role of the strong base: Strong bases can sometimes act as nucleophiles, but their primary function is to abstract protons. If the strong base is involved in proton abstraction rather than direct nucleophilic attack, the reaction mechanism may differ from a true Sₙ2 process.
Explore alternative mechanisms: The reaction might be classified as an E2 elimination rather than an Sₙ2 substitution. In an E2 mechanism, the strong base abstracts a proton from the β-carbon, leading to the formation of a double bond, while the leaving group departs simultaneously in a single step.
Conclude why it is not technically an Sₙ2 reaction: If the strong base is primarily involved in elimination rather than substitution, the reaction mechanism is better described as E2 rather than Sₙ2, despite the single-step nature and backside displacement.
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.
Substitution Reactions
Substitution reactions involve the replacement of one functional group in a molecule with another. In organic chemistry, these reactions can be classified into two main types: Sₙ1 and Sₙ2. Sₙ2 reactions are characterized by a single concerted step where the nucleophile attacks the electrophile from the opposite side of the leaving group, leading to inversion of configuration.
Video consigliato:
01:34
Recognizing Substitution Reactions.
Backside Attack
Backside attack refers to the mechanism by which a nucleophile approaches the electrophilic carbon atom from the side opposite to the leaving group. This approach is crucial for Sₙ2 reactions, as it allows for the simultaneous bond formation and bond breaking, resulting in inversion of stereochemistry. However, in certain cases, such as with strong bases and 1° haloalkanes, the reaction may proceed differently, affecting the classification.
Video consigliato:
02:16Using HX acids via SN2 reaction.
Strong Bases and Reaction Mechanisms
Strong bases can facilitate elimination reactions in addition to substitution reactions. When a strong base reacts with a 1° haloalkane, it may lead to an E2 elimination pathway instead of an Sₙ2 substitution. This duality in reactivity can complicate the classification of the reaction, as the presence of a strong base can favor elimination over substitution, even if a backside attack occurs.
Video consigliato:
03:10Monosaccharides - Strong Oxidation (Aldaric Acid)
Pratica correlata
Domanda del libro di testo
When trans-4-bromocyclohexanol is treated with base, an intramolecular substitution reaction occurs to give a cyclic ether. This product does not form when cis-4-bromocyclohexanol is reacted under the same conditions. Explain these observations.
845
views
Domanda del libro di testo
Suggest a mechanism for the following reactions.
(a) Substitution:
889
views
Domanda del libro di testo
The following chlorocyclohexane undergoes neither Sₙ2 nor E2 under the conditions shown. Why?
1491
views
Domanda del libro di testo
Using pKₐ values, calculate Keq for the following acid–base reaction.
1131
views
Domanda del libro di testo
In addition to using mCPBA, epoxides can be synthesized from alkenes in the two-step process shown. Give a mechanism for each step of the process.
1110
views