Textbook Question
Suggest an appropriate base to synthesize the alkene as the major product from the starting haloalkane.
(a)
1
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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 44a
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblem 44aChapter 11, Problem 44a
Paying close attention to the stereochemical outcome, predict the product of these elimination reactions.
(a) 
Verified step by step guidance1
Identify the type of elimination reaction (E1 or E2) based on the reaction conditions. For example, strong bases and high temperatures typically favor E2, while weak bases and polar protic solvents favor E1.
Determine the structure of the starting material, including the location of the leaving group and any β-hydrogens (hydrogens on the carbon adjacent to the carbon bearing the leaving group).
For E2 reactions, consider the anti-periplanar geometry requirement. The β-hydrogen and the leaving group must be in opposite planes (180° apart) for the elimination to occur. Rotate the molecule, if necessary, to visualize this geometry.
For E1 reactions, the first step is the formation of a carbocation intermediate after the leaving group departs. Assess the stability of the carbocation and consider any possible rearrangements (e.g., hydride or alkyl shifts) that could lead to a more stable carbocation.
Once the elimination occurs, predict the major product by applying Zaitsev's rule (the more substituted alkene is generally favored) while also considering stereochemical outcomes, such as the formation of E (trans) or Z (cis) isomers, depending on the steric and electronic factors.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
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. Common types include E1 and E2 mechanisms, which differ in their reaction pathways and stereochemical outcomes. Understanding the conditions and mechanisms of these reactions is crucial for predicting the products formed.
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Recognizing Elimination Reactions.
Stereochemistry
Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In elimination reactions, the stereochemical configuration of the starting material can influence the orientation of the double bond formed, leading to different stereoisomers. Recognizing the importance of stereochemistry is essential for predicting the correct product.
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Zaitsev's Rule
Zaitsev's Rule states that in elimination reactions, the more substituted alkene is typically the major product. This principle helps predict the outcome of reactions by favoring the formation of more stable alkenes, which are generally more substituted. Understanding this rule aids in anticipating the products based on the structure of the reactants.
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Related Practice
Textbook Question
Paying close attention to the stereochemical outcome, predict the product of these elimination reactions.
(c)
2
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Textbook Question
Paying close attention to the stereochemical outcome, predict the product of these elimination reactions.
(d)
1
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Textbook Question
The cis-diastereomer undergoes E2 elimination 500 times faster than the trans form. Explain.
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Textbook Question
Suggest an appropriate base to synthesize the alkene as the major product from the starting haloalkane.
(b)
1
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Textbook Question
Show a mechanism for the following elimination reactions. Label the mechanism as E1 or E2.
(d)
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