Textbook Question
Suggest an appropriate base to synthesize the alkene as the major product from the starting haloalkane.
(a)
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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 44c
Mullins 1st EditionCh. 12 - Substitution and Elimination: Reactions of HaloalkanesProblem 44cChapter 11, Problem 44c
Paying close attention to the stereochemical outcome, predict the product of these elimination reactions.
(c) 
Verified step by step guidance1
Step 1: Identify the type of elimination reaction. The presence of NaOH and H2O suggests that this is likely an E2 elimination reaction, as NaOH is a strong base.
Step 2: Analyze the stereochemistry of the molecule. The bromine atom is attached to a carbon that is adjacent to a β-hydrogen. Note that the β-hydrogen must be anti-periplanar to the leaving group (Br) for the E2 mechanism to proceed.
Step 3: Determine the possible β-hydrogens. In this case, there are two β-hydrogens available on the adjacent carbons. Evaluate which β-hydrogen is anti-periplanar to the bromine atom.
Step 4: Predict the double bond formation. The elimination of HBr will result in the formation of a double bond between the α-carbon (where Br is attached) and the β-carbon (where the β-hydrogen is removed). Consider the Zaitsev rule, which states that the more substituted alkene is generally favored.
Step 5: Draw the product with the correct stereochemistry. Ensure that the stereochemical outcome reflects the anti-periplanar geometry required for the E2 mechanism. The final product will be an alkene with the appropriate stereochemistry based on the starting material.
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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 a small molecule from a larger one, typically resulting in the formation of a double bond. In organic chemistry, common elimination reactions include E1 and E2 mechanisms, which differ in their steps and conditions. Understanding the mechanism is crucial for predicting the stereochemical outcome of the reaction.
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Recognizing Elimination Reactions.
Stereochemistry
Stereochemistry refers to the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In elimination reactions, the stereochemical outcome can lead to different products, such as cis or trans isomers, depending on the orientation of the leaving groups and the formation of the double bond. Recognizing stereochemical configurations is essential for accurate product prediction.
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Base Strength and Nucleophilicity
The strength of the base used in elimination reactions significantly influences the reaction pathway and product formation. Strong bases, like NaOH, favor E2 mechanisms, leading to the formation of alkenes. Understanding the role of the base helps in predicting whether the reaction will proceed via a concerted mechanism or through carbocation intermediates, impacting the stereochemical outcome.
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Related Practice
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
Provide a mechanism for the following E1 reactions.
(a)
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Textbook Question
Suggest an appropriate base to synthesize the alkene as the major product from the starting haloalkane.
(b)
1
views
Textbook Question
Paying close attention to the stereochemical outcome, predict the product of these elimination reactions.
(a)
1
views