Textbook Question
What is the major product of each of the following reactions?
a.
2
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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 81b
Bruice 8th EditionCh. 6 - The Reactions of Alkenes • The Stereochemistry of Addition ReactionsProblem 81bChapter 7, Problem 81b
What is the major product of each of the following reactions?
b. 
Verified step by step guidance1
Analyze the structure of the given molecule. It contains a hydroxyl group (-OH) and a double bond (alkene) in the chain. The reaction involves bromine (Br₂) in CH₂Cl₂, which is a typical reagent for electrophilic addition to alkenes.
Understand the mechanism of the reaction. Bromine reacts with the alkene via an electrophilic addition mechanism. The π-electrons of the double bond attack the bromine molecule, forming a bromonium ion intermediate.
Determine the regioselectivity and stereoselectivity of the reaction. Bromine adds across the double bond in an anti-addition manner, meaning the two bromine atoms will be added to opposite sides of the double bond.
Identify the major product. The bromine atoms will add to the carbons of the double bond, resulting in a vicinal dibromide. The hydroxyl group (-OH) does not participate in this reaction and remains unchanged.
Draw the final structure of the major product. The double bond is replaced by two bromine atoms attached to the carbons that were part of the double bond, and the stereochemistry reflects anti-addition.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Halohydrin Formation
Halohydrin formation is a reaction where alkenes react with halogens (like Br2) in the presence of water or alcohols to form halohydrins. This process involves the electrophilic addition of the halogen to the double bond, followed by the nucleophilic attack of water or alcohol on the more substituted carbon, leading to the formation of a halohydrin product.
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General properties of halohydrin formation.
Regioselectivity
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others when multiple possibilities exist. In the case of halohydrin formation, the regioselectivity is influenced by the stability of the carbocation intermediate formed during the reaction, favoring the more substituted carbon atom for the nucleophilic attack.
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Solvent Effects
The choice of solvent can significantly influence the outcome of a chemical reaction. In this case, CH2Cl2 (dichloromethane) is a non-polar solvent that can stabilize the halogen and facilitate the reaction without participating in it. The solvent's properties can affect the reaction rate and the regioselectivity of the halohydrin formation.
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Related Practice
Textbook Question
Draw the products of the following reactions. If the products can exist as stereoisomers, show which stereoisomers are formed.
i. (Z)-3,4-dimethyl-3-heptene + H2, Pd/C
2
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Textbook Question
Draw the products of the following reactions. If the products can exist as stereoisomers, show which stereoisomers are formed
c. 1-ethylcyclohexene + H2O + H2SO4
1
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Textbook Question
Draw the products of the following reactions. If the products can exist as stereoisomers, show which stereoisomers are formed
f. 1,2-dideuteriocyclohexene + H2, Pd/C
2
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Textbook Question
Propose a mechanism for each of the following reactions:
b.
1
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Textbook Question
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?
1
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