Textbook Question
After a proton is removed from the OH group, which compound in each pair forms a cyclic ether more rapidly?
c.
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Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides
Bruice8th EditionOrganic ChemistryISBN: 9780135213711
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Table of contents
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 1)31
- Ch. 1 - Remembering General Chemistry: Electronic Structure and Bonding (Part 2)65
- Ch. 2 - Acids and Bases: Central to Understanding Organic Chemistry84
- Ch. 3 - An Introduction to Organic Compounds:Nomenclature, Physical Properties, and Structure183
- Ch. 4 - Isomers: The Arrangement of Atoms in Space121
- Ch. 5 - Alkenes: Structure, Nomenclature, and an Introduction to Reactivity • Thermodynamics and Kinetics83
- Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions175
- Ch. 7 - The Reactions of Alkynes • An Introduction to Multistep Synthesis119
- Ch. 8 - Delocalized Electrons: Their Effect on Stability, pKa, and the Products of a Reaction • Aromaticity and Electronic Effects: An Introduction to the Reactions of Benzene148
- Ch. 9 - Substitution and Elimination Reactions of Alkyl Halides212
- Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds131
- Ch. 11 - Organometallic Compounds60
- Ch. 12 - Radicals90
- Ch. 13 - Mass Spectrometry; Infrared Spectroscopy; UV/Vis Spectroscopy62
- Ch. 14 - NMR Spectroscopy95
- Ch. 15 - Reactions of Carboxylic Acids and Carboxylic Acid Derivatives123
- Ch. 16 - Reactions of Aldehydes and Ketones • More Reactions of Carboxylic Acid Derivatives141
- Ch. 17 - Reactions at the Alpha-Carbon101
- Ch. 18 - Reactions of Benzene and Substituted Benzenes144
- Ch. 19 - More About Amines • Reactions of Heterocyclic Compounds49
- Ch. 20 - The Organic Chemistry of Carbohydrates80
- Ch. 21 - Amino Acids, Peptides, and Proteins57
- Ch. 22 - Catalysis in Organic Reactions and in Enzymatic Reactions35
- Ch. 23 - The Organic Chemistry of the Coenzymes—Compounds Derived from Vitamins1
- Ch. 28 - Pericyclic Reactions58
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Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 62
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 62Chapter 10, Problem 62
Identify the three products formed when 2-bromo-2-methylpropane is dissolved in a mixture of 80% ethanol and 20% water.
Verified step by step guidance1
Analyze the structure of 2-bromo-2-methylpropane. It is a tertiary alkyl halide, meaning the carbon attached to the bromine is bonded to three other carbon atoms. This makes it prone to undergoing substitution and elimination reactions via the SN1 and E1 mechanisms.
Recognize the solvent system: 80% ethanol and 20% water. This is a polar protic solvent, which stabilizes carbocations and favors the SN1 and E1 mechanisms. The solvent can also act as a nucleophile (ethanol and water) or a base (ethanol).
Understand the SN1 mechanism: The first step is the formation of a carbocation by the loss of the bromide ion (Br⁻). The carbocation can then react with the nucleophiles present in the solvent (ethanol and water) to form substitution products. Ethanol will form an ethoxy product, and water will form an alcohol product after proton transfer.
Understand the E1 mechanism: The carbocation can also lose a proton (H⁺) from a β-hydrogen atom, leading to the formation of an alkene product. Ethanol, acting as a weak base, facilitates this elimination reaction.
Combine the results: The three products formed are (1) the ethoxy substitution product (from ethanol), (2) the alcohol substitution product (from water), and (3) the alkene elimination product (via E1).
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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 case of 2-bromo-2-methylpropane, the bromine atom acts as the leaving group, and the nucleophile can be either ethanol or water, leading to different substitution products.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
Ethanol as a Solvent
Ethanol, being a polar protic solvent, can stabilize ions and facilitate nucleophilic attacks. In a mixture of 80% ethanol and 20% water, ethanol can act as a nucleophile, leading to the formation of ethyl 2-methylpropyl ether, while water can lead to the formation of 2-methylpropan-2-ol through substitution.
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Elimination Reactions
Elimination reactions involve the removal of a small molecule from a larger one, often resulting in the formation of alkenes. In the presence of a strong base or under certain conditions, 2-bromo-2-methylpropane can undergo elimination to form alkenes, such as 2-methylpropene, alongside the substitution products.
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00:40Recognizing Elimination Reactions.
Related Practice
Textbook Question
Under which of the following reaction conditions will (R)-1-chloro-1-phenylethane form the most (R)-1-phenyl-1-ethanol: in water or in 1.0 M HO−?
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Textbook Question
What products (including stereoisomers, if applicable) are formed from the reaction of 3-bromo-3-methylpentane:
b. with H2O?
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Textbook Question
After a proton is removed from the OH group, which compound in each pair forms a cyclic ether more rapidly?
a.
b.
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Textbook Question
What is the best way to prepare the following ethers using an alkyl halide and an alkoxide ion?
a.
b.
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Textbook Question
What is the best way to prepare the following ethers using an alkyl halide and an alkoxide ion?
c.
d.
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