Textbook Question
Predict the major products of the following reactions.
(c) 2-methylpent-2-ene + BH3⋅THF
(d) the product from part (c) + H2O2/OH−
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Ch.8 - Reactions of Alkenes
Wade9th EditionOrganic ChemistryISBN: 9780135213728
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Table of contents
- Ch.1 - Structure and Bonding107
- Ch. 2 - Acids and Bases; Functional Groups115
- Ch.3 - Structure and Stereochemistry of Alkanes100
- Ch.4 - The Study of Chemical Reactions99
- Ch.5 - Stereochemistry93
- Ch.6 - Alkyl Halides; Nucleophilic Substitution118
- Ch. 7 - Structure and Synthesis of Alkenes; Elimination158
- Ch.8 - Reactions of Alkenes171
- Ch.9 - Alkynes91
- Ch.10 - Structure and Synthesis of Alcohols143
- Ch.11 - Reactions of Alcohols104
- Ch. 12 - Infrared Spectroscopy and Mass Spectrometry22
- Ch. 13 - Nuclear Magnetic Resonance Spectroscopy45
- Ch. 14 - Ethers, Epoxides, and Thioethers72
- Ch. 15 - Conjugated Systems, Orbital Symmetry, and Ultraviolet Spectroscopy89
- Ch. 16 - Aromatic Compounds74
- Ch. 17 - Reactions of Aromatic Compounds126
- Ch. 18 - Ketones and Aldehydes193
- Ch. 19 - Amines129
- Ch. 20 - Carboxylic Acids77
- Ch. 21 - Carboxylic Acid Derivatives141
- Ch. 22 - Condensations and Alpha Substitutions of Carbonyl Compounds175
- Ch. 23 - Carbohydrates and Nucleic Acids93
- Ch. 24 - Amino Acids, Peptides, and Proteins54
Chapter 8, Problem 11c
Show how you would accomplish the following synthetic conversions.
c. 2-bromo-2,4-dimethylpentane → 2,4-dimethylpentan-3-ol
Verified step by step guidance1
Identify the functional group transformation: The starting material is 2-bromo-2,4-dimethylpentane (an alkyl halide), and the target compound is 2,4-dimethylpentan-3-ol (an alcohol). This suggests a substitution reaction where the bromine atom is replaced by a hydroxyl group (-OH).
Choose the appropriate reaction mechanism: Since the starting material is a tertiary alkyl halide, the substitution reaction is likely to proceed via an SN1 mechanism. Tertiary alkyl halides favor the SN1 mechanism due to the stability of the carbocation intermediate.
Select the nucleophile and reaction conditions: Use water (H₂O) or a hydroxide ion (OH⁻) as the nucleophile. Water can act as a weak nucleophile in the SN1 reaction, while hydroxide ion can be used under basic conditions to achieve the substitution.
Outline the reaction mechanism: In the SN1 mechanism, the reaction proceeds in two steps: (1) The bromine atom leaves, forming a tertiary carbocation intermediate. (2) The nucleophile (H₂O or OH⁻) attacks the carbocation, resulting in the formation of the alcohol product.
Consider any necessary workup: If water is used as the nucleophile, the intermediate product will be a protonated alcohol. Perform a deprotonation step (e.g., using a base) to yield the neutral alcohol, 2,4-dimethylpentan-3-ol.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilic Substitution
Nucleophilic substitution is a fundamental reaction in organic chemistry where a nucleophile replaces a leaving group in a molecule. In the context of the conversion from 2-bromo-2,4-dimethylpentane to 2,4-dimethylpentan-3-ol, a nucleophile, such as hydroxide ion (OH-), can attack the carbon bonded to the bromine atom, leading to the formation of an alcohol.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
Rearrangement Reactions
Rearrangement reactions involve the structural reorganization of a molecule to form a different isomer. In this synthetic conversion, understanding how the carbon skeleton can rearrange during the reaction is crucial, especially if the reaction pathway involves carbocation intermediates that can lead to more stable structures.
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Alcohol Functional Group
The alcohol functional group (-OH) is characterized by the presence of a hydroxyl group attached to a carbon atom. In the target molecule, 2,4-dimethylpentan-3-ol, recognizing the position of the hydroxyl group is essential for understanding the properties and reactivity of the compound, as well as the implications for synthesis and potential reactions it may undergo.
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Related Practice
Textbook Question
Show how you would accomplish the following synthetic conversions.
a. but-1-ene → butan-1-ol
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Textbook Question
Show how you would accomplish the following synthetic conversions.
(b) but-1-ene → butan-2-ol
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Textbook Question
Predict the major products of the following reactions. Include stereochemistry where applicable.
(a) 1−methylcyclohexene + BH3⋅THF then H2O2, OH–
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Textbook Question
In the hydroboration of 1-methylcyclopentene shown in Solved Problem 8-3, the reagents are achiral, and the products are chiral. The product is a racemic mixture of trans-2-methylcyclopentanol, but only one enantiomer is shown. Show how the other enantiomer is formed.
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Textbook Question
Predict the major products of the following reactions. Include stereochemistry where applicable.
(b) trans-4,4-dimethylpent-2-ene + BH3⋅THF then H2O2, OH–
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