Textbook Question
What is the major product of each of the following reactions?
a.
1500
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Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions
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. 6 - The Reactions of Alkenes • The Stereochemistry of Addition ReactionsProblem 79
Bruice 8th EditionCh. 6 - The Reactions of Alkenes • The Stereochemistry of Addition ReactionsProblem 79Chapter 7, Problem 79
Which stereoisomer of 3-hexene forms (3S,4S)-4-bromo-3-hexanol and (3R,4R)-4-bromo-3-hexanol when it reacts with Br2 and H2O?
Verified step by step guidance1
Identify the structure of 3-hexene. It is a six-carbon alkene with a double bond between carbons 3 and 4. The stereoisomers of 3-hexene are the cis (Z) and trans (E) forms. These differ in the spatial arrangement of the substituents around the double bond.
Understand the reaction mechanism. When 3-hexene reacts with Br2 and H2O, it undergoes a halohydrin formation reaction. In this reaction, the bromine molecule (Br2) adds across the double bond, and water acts as a nucleophile to form a bromohydrin.
Analyze the stereochemical outcome. The addition of Br2 to the double bond occurs via an anti-addition mechanism, meaning the bromine and hydroxyl groups will add to opposite faces of the double bond. This anti-addition leads to the formation of enantiomers.
Determine which stereoisomer of 3-hexene leads to the specified products. The (3S,4S)-4-bromo-3-hexanol and (3R,4R)-4-bromo-3-hexanol are enantiomers, which means they are formed from the cis (Z) isomer of 3-hexene. The cis isomer allows for the anti-addition to produce these specific stereochemical configurations.
Conclude that the cis (Z) stereoisomer of 3-hexene is the one that forms (3S,4S)-4-bromo-3-hexanol and (3R,4R)-4-bromo-3-hexanol when it reacts with Br2 and H2O.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Stereoisomerism
Stereoisomerism refers to the phenomenon where compounds have the same molecular formula and connectivity of atoms but differ in the spatial arrangement of their atoms. This can lead to different physical and chemical properties. In the case of alkenes like 3-hexene, stereoisomers can exist as cis or trans forms, which are crucial for determining the outcome of reactions involving stereospecificity.
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Electrophilic Addition Reactions
Electrophilic addition reactions are a type of reaction where an electrophile reacts with a nucleophile, typically involving alkenes. In the context of 3-hexene reacting with Br2 and H2O, the double bond acts as a nucleophile, attacking the electrophilic bromine, leading to the formation of bromohydrins. Understanding this mechanism is essential for predicting the stereochemical outcomes of the reaction.
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Stereochemistry of Reaction Products
Stereochemistry involves the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the reaction of 3-hexene with Br2 and H2O, the stereochemistry of the resulting products, (3S,4S)-4-bromo-3-hexanol and (3R,4R)-4-bromo-3-hexanol, is determined by the mechanism of the addition reaction and the configuration of the starting alkene. This concept is vital for predicting which stereoisomer will be formed.
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Related Practice
Textbook Question
Propose a mechanism for each of the following reactions:
b.
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Textbook Question
Draw the products, including their configurations, obtained from the reaction of 1-ethylcyclohexene with the following reagents:
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Draw the products, including their configurations, obtained from the reaction of 1-ethylcyclohexene with the following reagents:
c. R2BH/THF, followed by HO–, H2O2, H2O
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Textbook Question
What is the major product of each of the following reactions?
b.
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Textbook Question
Which stereoisomer of 3-hexene forms a meso compound when it reacts with Br2?
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