Textbook Question
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(d)
2
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Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- 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 I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: 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 I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: 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: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblem 56a
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblem 56aChapter 11, Problem 56a
Predict the product(s) of the following substitution or elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(a) 
Verified step by step guidance1
Step 1: Analyze the given reaction conditions. The substrate is a cyclohexyl chloride with a double bond and a methyl group. The reagent is potassium cyanide (KCN) in acetone, which is a polar aprotic solvent. This suggests that the reaction will likely proceed via an SN2 mechanism.
Step 2: Consider the stereochemistry of the substrate. The chlorine atom is attached to the cyclohexane ring in a wedge (out of the plane), indicating its stereochemical orientation. In an SN2 reaction, the nucleophile attacks from the opposite side of the leaving group, leading to an inversion of configuration.
Step 3: Identify the nucleophile and leaving group. The cyanide ion (CN⁻) is the nucleophile, and the chloride ion (Cl⁻) is the leaving group. The cyanide ion will attack the carbon bonded to the chlorine, displacing the chloride ion.
Step 4: Predict the product. The cyanide ion will replace the chlorine atom, and due to the SN2 mechanism, the stereochemistry at the carbon center will invert. The CN group will now be in the opposite stereochemical orientation (dash, into the plane).
Step 5: Verify the reaction type and stereochemical outcome. Since the reaction occurs in a polar aprotic solvent and involves a strong nucleophile, the SN2 mechanism is confirmed. The product will be a cyclohexane ring with a double bond, a methyl group, and a cyanide group in the inverted stereochemical position.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilic Substitution Reactions
Nucleophilic substitution reactions involve the replacement of a leaving group in a molecule by a nucleophile. These reactions can occur via two main mechanisms: SN1, which is a two-step process involving carbocation formation, and SN2, which is a one-step process where the nucleophile attacks the substrate simultaneously as the leaving group departs. Understanding the mechanism is crucial for predicting the products and their stereochemistry.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
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. The two primary types are E1, which proceeds through a carbocation intermediate, and E2, which is a concerted mechanism. The choice between substitution and elimination often depends on the structure of the substrate and the reaction conditions.
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Stereochemistry
Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In substitution and elimination reactions, the stereochemical outcome can lead to different isomers, such as cis/trans or R/S configurations. Recognizing the stereochemical implications is essential for accurately predicting the products of these reactions, especially in chiral environments.
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Related Practice
Textbook Question
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(c)
1
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Textbook Question
Predict the major product(s) of the following elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(f)
2
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Textbook Question
Predict the product(s) of the following substitution or elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(e)
1
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Textbook Question
Predict the product(s) of the following substitution or elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(g)
2
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Textbook Question
Predict the product(s) of the following substitution or elimination reactions, paying close attention to the stereochemical outcome of the reactions.
(d)
5
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