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Given the reactants shown, what type of elimination would you expect to occur?
(c)
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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 41b
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblema 41bCapitolo 11, Problema 41b
Given the reactants shown, what type of elimination would you expect to occur?
(b) 
Guida verificata passo dopo passo1
Step 1: Analyze the structure of the reactants. The molecule on the left contains a cyclopentane ring with a chlorine atom attached to a carbon that is adjacent to a double bond. This is a secondary alkyl halide. The molecule on the right is tert-butanol, which is a bulky alcohol.
Step 2: Consider the reaction conditions. Tert-butanol is often used in elimination reactions, and its bulky nature suggests that steric hindrance will favor elimination over substitution. Additionally, the presence of a strong base (likely the alkoxide form of tert-butanol) will promote elimination.
Step 3: Determine the type of elimination mechanism. The bulky base and the secondary alkyl halide suggest that the reaction will proceed via an E2 mechanism. In an E2 reaction, the base abstracts a proton from a β-carbon, and the leaving group (chlorine) departs simultaneously, forming a double bond.
Step 4: Examine the stereochemistry of the elimination. For an E2 reaction, the β-hydrogen and the leaving group must be anti-periplanar (i.e., opposite and in the same plane). In this case, the chlorine atom and the β-hydrogen are positioned appropriately for anti-periplanar elimination.
Step 5: Predict the product. The elimination will result in the formation of a conjugated diene, as the double bond already present in the molecule will extend conjugation with the newly formed double bond. This increases the stability of the product.
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Elimination Reactions
Elimination reactions involve the removal of atoms or groups from a molecule, resulting in the formation of a double bond or a ring structure. In organic chemistry, these reactions are typically classified as either E1 or E2 mechanisms, depending on the reaction conditions and the nature of the substrate. Understanding the type of elimination is crucial for predicting the products formed during the reaction.
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00:40
Recognizing Elimination Reactions.
E2 Mechanism
The E2 mechanism is a concerted elimination process where a base abstracts a proton while a leaving group departs simultaneously, leading to the formation of a double bond. This mechanism is favored in strong bases and requires a specific geometric arrangement of the substrate, often involving anti-periplanar orientation of the leaving group and the hydrogen being removed. Recognizing the conditions that favor E2 is essential for predicting the outcome of the reaction.
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09:36Drawing the E2 Mechanism.
Substituent Effects
The presence of substituents on a cyclohexene can significantly influence the type of elimination reaction that occurs. For instance, bulky groups can hinder certain pathways, while electron-withdrawing or donating groups can stabilize transition states or intermediates. Understanding how these substituents affect reactivity and selectivity is vital for predicting the products of elimination reactions.
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Percorso guidato
2:02Directing Effects in Substituted Pyrroles, Furans, and Thiophenes Concept 1
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