Textbook Question
Rank the reactivity of the following alkenes with mCPBA ( 1 = most reactive , 5 least reactive ).
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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 45l(iii,iv)
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (iii) Br2, H2O ; (iv) Cl2, CH3OH;
(l) 
Verified step by step guidance1
Step 1: Analyze the structure of the given alkene. The molecule contains a double bond, which is the reactive site for electrophilic addition reactions. Identify the position of the double bond and any stereochemistry or substituents that may influence the reaction.
Step 2: For reaction (iii) with Br₂ and H₂O, understand that this is a halohydrin formation reaction. Bromine (Br₂) adds to the double bond, forming a bromonium ion intermediate. Water (H₂O) then attacks the more substituted carbon of the bromonium ion, leading to the formation of a halohydrin with anti stereochemistry.
Step 3: For reaction (iv) with Cl₂ and CH₃OH, recognize that this is a similar reaction to halohydrin formation, but methanol (CH₃OH) acts as the nucleophile instead of water. Chlorine (Cl₂) adds to the double bond, forming a chloronium ion intermediate. Methanol attacks the more substituted carbon of the chloronium ion, resulting in the formation of an ether with anti stereochemistry.
Step 4: Consider regioselectivity and stereochemistry for both reactions. The nucleophile (H₂O or CH₃OH) will attack the more substituted carbon of the intermediate due to stability considerations, and the addition will occur with anti stereochemistry.
Step 5: Predict the products for each reaction based on the mechanism. For (iii), the product will be a bromohydrin with anti stereochemistry. For (iv), the product will be a chloroether with anti stereochemistry. Ensure that the stereochemistry of the substituents on the original molecule is preserved in the final products.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Electrophilic Addition Reactions
Electrophilic addition reactions are a fundamental type of reaction for alkenes, where an electrophile reacts with the double bond of the alkene. This process typically involves the formation of a carbocation intermediate, which can lead to the addition of various nucleophiles. Understanding this mechanism is crucial for predicting the products formed when alkenes react with halogens or other electrophiles.
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Features of Addition Mechanisms.
Regioselectivity
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others when multiple products are possible. In the context of alkene reactions, the Markovnikov rule often applies, indicating that the more substituted carbocation will be formed preferentially. This concept is essential for predicting the major product when alkenes react with halogens in the presence of solvents like water or alcohol.
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Solvent Effects
The choice of solvent can significantly influence the outcome of a chemical reaction, particularly in electrophilic addition reactions. For example, using water as a solvent can lead to the formation of alcohols through hydration, while using methanol can result in ether formation. Understanding how solvents interact with reactants helps in predicting the products of reactions involving alkenes and halogens.
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Related Practice
Textbook Question
When alkenes react with bromine in water, a halohydrin is produced. When water is replaced with methanol in this reaction, a different product is produced. Suggest a mechanism for the formation of this product.
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Textbook Question
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (ix) H2, Pd/C; and (x) D2, Pd/C.
(l)
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Textbook Question
In light of your answer to Assessment 9.47, predict the product of the following reactions we have seen previously where an alcohol is substituted for water.
(a)
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Textbook Question
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (i) Br2 (ii) Cl2
(l)
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Textbook Question
Predict the product(s) that would result when the alkenes are allowed to react under the following conditions: (v) mCPBA; (vi) 1. OsO4 2. NaHSO3
(l)
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