Textbook Question
When heated with H2SO4, both 3,3-dimethyl-2-butanol and 2,3-dimethyl-2-butanol are dehydrated to form 2,3-dimethyl-2-butene. Which alcohol dehydrates more rapidly?
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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 58a
Bruice 8th EditionCh. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing CompoundsProblem 58aChapter 11, Problem 58a
Starting with (R)-1-deuterio-1-propanol, how could you prepare
a. (S)-1-deuterio-1-propanol?
Verified step by step guidance1
Identify the stereochemistry of the starting material, (R)-1-deuterio-1-propanol. The (R) configuration indicates the specific spatial arrangement of the substituents around the chiral center.
To convert the (R)-1-deuterio-1-propanol to its enantiomer, (S)-1-deuterio-1-propanol, you need to invert the stereochemistry at the chiral center. This can be achieved through a two-step process: conversion to an intermediate and subsequent inversion.
Step 1: Convert the alcohol group (-OH) into a good leaving group. This can be done by reacting (R)-1-deuterio-1-propanol with a reagent like p-toluenesulfonyl chloride (TsCl) in the presence of a base (e.g., pyridine) to form the corresponding tosylate. The tosylate group is an excellent leaving group.
Step 2: Perform an SN2 reaction with a nucleophile (e.g., hydroxide ion, OH⁻) to replace the tosylate group with a hydroxyl group. The SN2 mechanism involves a backside attack, which inverts the stereochemistry at the chiral center, resulting in (S)-1-deuterio-1-propanol.
Finally, confirm the stereochemistry of the product using spectroscopic methods (e.g., NMR or optical rotation) to ensure the desired (S)-configuration has been achieved.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stereochemistry
Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In this context, it is crucial to understand the difference between enantiomers, which are molecules that are mirror images of each other, such as (R)- and (S)-1-deuterio-1-propanol. The ability to manipulate these configurations is essential for synthesizing specific stereoisomers.
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Chiral Centers
A chiral center, often a carbon atom, is bonded to four different substituents, leading to non-superimposable mirror images. In the case of 1-deuterio-1-propanol, the chiral center's configuration determines whether the molecule is in the (R) or (S) form. Understanding how to identify and modify chiral centers is key to synthesizing the desired stereoisomer.
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05:41Understanding Other Chiral Atoms
Reactions for Synthesis
Various chemical reactions can be employed to convert one stereoisomer into another, such as inversion reactions or specific chiral catalysts. For example, using a suitable reagent that selectively reacts with the (R)-1-deuterio-1-propanol can lead to the formation of (S)-1-deuterio-1-propanol. Familiarity with these synthetic pathways is essential for achieving the desired product.
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Related Practice
Textbook Question
Starting with (R)-1-deuterio-1-propanol, how could you prepare
c. (R)-1-deuterio-1-methoxypropane?
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Textbook Question
Starting with (R)-1-deuterio-1-propanol, how could you prepare
b. (S)-1-deuterio-1-methoxypropane?
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Textbook Question
a. Show the reagents required to form the primary alcohol in each of the following reactions.
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Textbook Question
Indicate which alcohol in each pair undergoes an elimination reaction more rapidly when heated with H2SO4.
e.
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Textbook Question
Identify A–E.
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