Textbook Question
The following reaction takes place several times faster than the reaction of 2-chlorobutane with HO-:
b. Explain why the OH group in the product is not bonded to the carbon that was bonded to the Cl group in the reactant.
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Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds
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. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblem 89a
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblem 89aChapter 11, Problem 89a
The following reaction takes place several times faster than the reaction of 2-chlorobutane with HO-:
a. Explain the enhanced reaction rate.
Verified step by step guidance1
Identify the structure of the compound in the reaction. 2-chlorobutane is a secondary alkyl halide, and the reaction involves a nucleophile (HO⁻). This suggests the reaction mechanism could be either SN1 or SN2.
Analyze the factors affecting the reaction rate. In an SN2 reaction, the rate depends on steric hindrance and the strength of the nucleophile. In an SN1 reaction, the rate depends on the stability of the carbocation intermediate formed after the leaving group departs.
Consider the leaving group. Chlorine (Cl) is a good leaving group because it can stabilize the negative charge after leaving as Cl⁻. This facilitates the reaction.
Examine the role of the nucleophile (HO⁻). Hydroxide is a strong nucleophile, which favors the SN2 mechanism. However, the reaction rate enhancement could also be due to the stability of the transition state or intermediate.
Propose the reason for the enhanced reaction rate. The enhanced rate could be due to a more favorable transition state or intermediate stability in the given reaction compared to 2-chlorobutane with HO⁻. For example, if the reaction involves a tertiary alkyl halide or a resonance-stabilized carbocation, the reaction rate would be significantly faster due to reduced steric hindrance (SN2) or increased carbocation stability (SN1).
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Nucleophilicity
Nucleophilicity refers to the ability of a nucleophile to donate an electron pair to an electrophile during a chemical reaction. In this context, HO- (hydroxide ion) is a strong nucleophile, but the structure of 2-chlorobutane may hinder its approach to the electrophilic carbon. A more accessible nucleophile or a better leaving group can significantly enhance the reaction rate.
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Nucleophilic Addition
Leaving Group Ability
The leaving group ability is a critical factor in determining the rate of nucleophilic substitution reactions. A good leaving group can stabilize the transition state and facilitate the departure from the substrate. In the case of 2-chlorobutane, if the leaving group is less favorable compared to other substrates, it can slow down the reaction, making it essential to consider the nature of the leaving group in the reaction mechanism.
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03:06How to use the factors affecting acidity to predict leaving group ability.
Steric Hindrance
Steric hindrance refers to the crowding around a reactive site that can impede the approach of nucleophiles to electrophiles. In the case of 2-chlorobutane, the presence of bulky groups around the reactive carbon can slow down the reaction with HO-. A less hindered substrate would allow for a faster reaction rate, highlighting the importance of molecular structure in reaction kinetics.
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02:53Understanding steric effects.
Related Practice
Textbook Question
Propose a mechanism for each of the following reactions:
b.
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Textbook Question
Propose a mechanism for the following reaction:
Textbook Question
b. A small amount of a product containing a six-membered ring is also formed. Draw the structure of that product.
c. Why is so little six-membered ring product formed?
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Textbook Question
a. Propose a mechanism for the following reaction:
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Textbook Question
Which of the following reactions occurs more rapidly?
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