Textbook Question
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (v) mCPBA
(d)
2
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Ch. 9 - Alkenes II: Oxidation and Reduction
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
Chapter 8, Problem 45d(i)
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (i) Br2
(d) 
Verified step by step guidance1
Step 1: Recognize the type of reaction. The reaction involves an alkene reacting with bromine (Br₂), which is a halogen addition reaction. This is a classic electrophilic addition reaction where bromine adds across the double bond of the alkene.
Step 2: Identify the mechanism. Bromine (Br₂) is a non-polar molecule, but when it approaches the electron-rich double bond of the alkene, it becomes polarized. The π-electrons of the alkene attack the bromine molecule, forming a bromonium ion intermediate.
Step 3: Understand the stereochemistry. The bromonium ion intermediate is cyclic and prevents free rotation. The second bromine ion (Br⁻) attacks the more accessible side of the bromonium ion, leading to anti-addition (the two bromine atoms add on opposite sides of the double bond).
Step 4: Predict the product. The final product will be a vicinal dibromide, where two bromine atoms are attached to adjacent carbons that were originally part of the double bond. The stereochemistry will be anti (opposite sides).
Step 5: Consider regioselectivity and stereochemistry. If the alkene is symmetrical, the product will be a single compound. If the alkene is asymmetrical, you may need to consider the specific structure of the alkene to determine the exact stereoisomers formed.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Electrophilic Addition
Electrophilic addition is a fundamental reaction mechanism in organic chemistry where an electrophile reacts with a nucleophile, typically involving alkenes. In the case of alkenes reacting with Br₂, the double bond acts as a nucleophile, attacking the electrophilic bromine molecule, leading to the formation of a cyclic bromonium ion intermediate.
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Bromonium Ion Formation
The bromonium ion is a key intermediate formed during the reaction of alkenes with bromine. This three-membered ring structure stabilizes the positive charge on the bromine atom, allowing for the subsequent attack by a bromide ion. Understanding this intermediate is crucial for predicting the stereochemistry and regioselectivity of the final product.
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Stereochemistry of Addition Reactions
Stereochemistry refers to the spatial arrangement of atoms in molecules and is particularly important in addition reactions involving alkenes. When Br₂ adds to an alkene, the reaction typically results in anti-addition, leading to the formation of vicinal dibromides with specific stereochemical configurations. Recognizing these configurations helps in predicting the final product's structure.
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Related Practice
Textbook Question
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (vi) 1. OsO4 2. NaHSO3
(d)
2
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Textbook Question
Determine whether the following reactions are redox reactions. If they are, identify whether the molecule has been oxidized or reduced.
(c)
2
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Textbook Question
Determine whether the following reactions are redox reactions. If they are, identify whether the molecule has been oxidized or reduced.
(d)
2
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Textbook Question
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (x) D2, Pd/C.
(d)
Textbook Question
Determine whether the following reactions are redox reactions. If they are, identify whether the molecule has been oxidized or reduced.
(b)
1
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