Textbook Question
Allylic halides have the structure
c. Show the products expected from SN1 solvolysis of these halides in ethanol.
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Ch.6 - Alkyl Halides; Nucleophilic Substitution
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 6, Problem 40c,d
Give the substitution products expected from solvolysis of each compound by heating in ethanol.
(c) 
(d) 
Verified step by step guidance1
Step 1: Identify the type of halide in each compound. Both compounds contain a bromine atom attached to a carbon atom. In compound (c), bromine is attached to a secondary carbon, while in compound (d), bromine is attached to a tertiary carbon.
Step 2: Recognize the reaction conditions. Solvolysis in ethanol typically proceeds via an SN1 mechanism, especially for secondary and tertiary alkyl halides. This involves the formation of a carbocation intermediate after the departure of the bromide ion.
Step 3: Analyze the stability of the carbocation intermediates. In compound (c), the secondary carbocation formed is moderately stable. In compound (d), the tertiary carbocation formed is highly stable due to hyperconjugation and inductive effects from the surrounding alkyl groups.
Step 4: Predict the substitution product. Ethanol acts as the nucleophile in this reaction. After the carbocation is formed, ethanol will attack the positively charged carbon, leading to the formation of an ethyl ether product (R-OCH2CH3).
Step 5: Consider any potential rearrangements. For compound (c), no rearrangement is expected as the secondary carbocation is relatively stable. For compound (d), no rearrangement is needed as the tertiary carbocation is already highly stable.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Solvolysis
Solvolysis is a type of nucleophilic substitution reaction where a solvent acts as a nucleophile. In organic chemistry, this often involves the reaction of an alkyl halide with a solvent like ethanol, leading to the formation of substitution products. The reaction typically proceeds through either an SN1 or SN2 mechanism, depending on the structure of the substrate and the conditions of the reaction.
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08:16
Understanding the properties of SN1.
Nucleophilic Substitution Mechanisms
Nucleophilic substitution can occur via two primary mechanisms: SN1 and SN2. The SN1 mechanism involves a two-step process where the leaving group departs first, forming a carbocation intermediate, followed by nucleophilic attack. In contrast, the SN2 mechanism is a one-step process where the nucleophile attacks the substrate simultaneously as the leaving group departs, leading to an inversion of configuration at the carbon center.
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01:47Nucleophiles and Electrophiles can react in Substitution Reactions.
Ethanol as a Solvent
Ethanol is a polar protic solvent that can stabilize ions and facilitate nucleophilic substitution reactions. Its ability to donate hydrogen bonds makes it effective in solvolysis, as it can stabilize the carbocation formed in SN1 reactions or assist in the nucleophilic attack in SN2 reactions. The choice of solvent can significantly influence the reaction pathway and the products formed.
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Related Practice
Textbook Question
Chlorocyclohexane reacts with sodium cyanide (NaCN) in ethanol to give cyanocyclohexane. The rate of formation of cyanocyclohexane increases when a small amount of sodium iodide is added to the solution. Explain this acceleration in the rate.
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Textbook Question
Allylic halides have the structure
a. Show how the first-order ionization of an allylic halide leads to a resonance-stabilized cation.
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Textbook Question
When tert-butyl bromide is heated with an equal amount of ethanol in an inert solvent, one of the products is ethyl tert-butyl ether.
b. What happens to the rate if the concentration of tert-butyl bromide is tripled and the concentration of ethanol is doubled?
c. What happens to the rate if the temperature is raised?
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Textbook Question
Give the substitution products expected from solvolysis of each compound by heating in ethanol.
(a)
(b)
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Textbook Question
Allylic halides have the structure
b. Draw the resonance structures of the allylic cations formed by ionization of the following halides.
(i)
(ii)
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