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 48a
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) 
Verified step by step guidance1
Step 1: Analyze the reactants and reaction conditions. The starting material is an ether with a bulky tert-butyl group and a secondary alcohol group. The reaction conditions include H2SO4 (sulfuric acid), which is a strong acid, and ethanol (CH3CH2OH), which acts as a nucleophile.
Step 2: Recognize the mechanism involved. Under acidic conditions, ethers can undergo cleavage via protonation of the oxygen atom, making it more electrophilic. This leads to the formation of a carbocation intermediate.
Step 3: Predict the protonation step. The oxygen atom in the ether is protonated by H2SO4, resulting in the formation of a good leaving group (water or an alcohol group). This sets the stage for the cleavage of the ether bond.
Step 4: Consider the carbocation stability. The tert-butyl group is highly stabilizing for carbocations due to hyperconjugation and inductive effects. Therefore, the cleavage will likely result in the formation of a tert-butyl carbocation.
Step 5: Predict the nucleophilic attack. Ethanol (CH3CH2OH) will act as a nucleophile and attack the carbocation, leading to the formation of an ether product where the tert-butyl group is bonded to the ethoxy group (CH3CH2O-).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Alcohol Substitution Reactions
In organic chemistry, alcohols can undergo substitution reactions where the hydroxyl (-OH) group is replaced by another group, such as a halide or an alkyl group. This process often involves the activation of the alcohol, typically by protonation, to form a better leaving group. Understanding this concept is crucial for predicting the products of reactions involving alcohols.
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01:44
Forming alcohols through SN2 reactions.
Acid-Catalyzed Reactions
Acid-catalyzed reactions involve the use of an acid, such as sulfuric acid (H2SO4), to facilitate the reaction mechanism. In the context of alcohol substitution, the acid protonates the alcohol, enhancing its electrophilicity and making it more reactive. This concept is essential for understanding how the reaction proceeds and the role of the acid in the transformation.
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Mechanism of Nucleophilic Substitution
Nucleophilic substitution mechanisms, such as SN1 and SN2, describe how nucleophiles attack electrophiles to replace a leaving group. In the case of alcohol substitution, the mechanism can vary based on the structure of the substrate and the conditions of the reaction. Recognizing the type of mechanism at play helps in predicting the structure of the final product.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Related Practice
Textbook Question
One way to think about concerted reactions is to imagine them as being stepwise reactions where, besides the slowest step, all others have infinitesimally small activation energies. Considering the hypothetical stepwise mechanism and actual concerted mechanism of epoxide formation, show what a reaction coordinate diagram might look like for each possibility.
(a) Stepwise, hypothetical mechanism:
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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.
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)
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.
(c)
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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.
(b)
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