Textbook Question
Draw the substitution products for each of the following reactions; if the products can exist as stereoisomers, show what stereoisomers are obtained:
e. 1-bromo-2-butene + CH3O−
f. 1-bromo-2-butene + CH3OH
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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 77c,d
Bruice 8th EditionCh. 9 - Substitution and Elimination Reactions of Alkyl HalidesProblem 77c,dChapter 10, Problem 77c,d
Draw the substitution products for each of the following reactions; if the products can exist as stereoisomers, show what stereoisomers are obtained:
c. benzyl chloride + CH3CH2OH
d. allyl chloride + CH3OH
Verified step by step guidance1
Identify the type of reaction: Both reactions involve alkyl halides (benzyl chloride and allyl chloride) reacting with alcohols (CH3CH2OH and CH3OH). These are nucleophilic substitution reactions, which can proceed via either the SN1 or SN2 mechanism depending on the structure of the alkyl halide.
Analyze the structure of the alkyl halides: Benzyl chloride has a benzyl group (C6H5CH2-) attached to the chlorine atom, which stabilizes a carbocation intermediate due to resonance. Allyl chloride has an allyl group (CH2=CH-CH2-) attached to the chlorine atom, which also stabilizes a carbocation intermediate via resonance. Both are likely to proceed via the SN1 mechanism.
Determine the nucleophile and solvent: The alcohols (CH3CH2OH and CH3OH) act as both the nucleophile and the solvent in these reactions. In an SN1 reaction, the alcohol will attack the carbocation intermediate formed after the departure of the chloride ion (Cl⁻).
Predict the substitution products: For benzyl chloride + CH3CH2OH, the product will be benzyl ethyl ether (C6H5CH2OCH2CH3). For allyl chloride + CH3OH, the product will be allyl methyl ether (CH2=CH-CH2OCH3).
Consider stereoisomers: In the case of benzyl chloride, the carbocation intermediate is planar and symmetric due to resonance, so no stereoisomers are formed. For allyl chloride, the product does not involve a stereogenic center, so no stereoisomers are formed here either.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilic Substitution Reactions
Nucleophilic substitution reactions involve the replacement of a leaving group in a molecule by a nucleophile. In the given reactions, benzyl chloride and allyl chloride serve as substrates, while ethanol and methanol act as nucleophiles. Understanding the mechanism (either SN1 or SN2) is crucial, as it influences the reaction pathway and the stereochemistry of the products.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
Stereochemistry and Stereoisomers
Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical properties. In reactions that produce chiral centers, stereoisomers can form, which are molecules that have the same molecular formula but differ in the orientation of their atoms in space. Recognizing potential stereoisomers is essential for accurately depicting the products of the reactions.
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Chirality and Chiral Centers
Chirality is a property of a molecule that makes it non-superimposable on its mirror image, often due to the presence of a chiral center, typically a carbon atom bonded to four different substituents. In the context of the reactions provided, identifying chiral centers in the substitution products is important for determining the possible stereoisomers that can be formed, which can significantly affect the reactivity and properties of the compounds.
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Related Practice
Textbook Question
Draw the substitution products for each of the following reactions; if the products can exist as stereoisomers, show what stereoisomers are obtained:
a. (R)-2-bromopentane+CH3O−
b. (R)-3-bromo-3-methylheptane+CH3OH
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Textbook Question
The pKa of acetic acid in water is 4.76. What effect will a decrease in the polarity of the solvent have on the pKa? Why?
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Textbook Question
Alkylbenzyldimethyl ammonium chloride is a leave-on skin antiseptic used to treat such things as cuts and cold sores. It is also the antiseptic in many hand sanitizers. It is actually a mixture of compounds that differ in the number of carbons (any even number between 8 and 18) in the alkyl group. Show three different sets of reagents (each set composed of an alkyl chloride and an amine) that can be used to synthesize the alkylbenzyldimethyl ammonium chloride shown here.
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Textbook Question
Would you expect methoxide ion to be a better nucleophile if it is dissolved in CH3OH or if it is dissolved in DMSO? Why?
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Textbook Question
a. Identify the substitution products that form when 2-bromo-2-methylpropane is dissolved in a mixture of 80% ethanol and 20% water.
b. Explain why the same products are obtained when 2-chloro-2-methylpropane is dissolved in a mixture of 80% ethanol and 20% water.
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