Textbook Question
Predict the product(s) that would result when the alkenes shown here are allowed to react under the following conditions: (iv) H2SO4 , H2O
(g)
1145
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Ch. 8 - Alkenes I: Properties and Electrophilic Additions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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Table of contents
- Ch. 2 - General Chemistry Translated: Finding the Electrons114
- Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis109
- Ch. 4 - Acids and Bases: Electron Flow144
- Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics118
- Ch. 6 - Stereoisomerism: Arrangement of Atoms in Space112
- Ch. 7 - Principles of Green (Organic) Chemistry3
- Ch. 8 - Alkenes I: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes II: Oxidation and Reduction150
- Ch. 10 - Alkynes: Electrophilic Addition and Redox Reactions101
- Ch. 11 - Properties and Synthesis of Alkyl Halides: Radical Reactions108
- Ch. 12 - Substitution and Elimination: Reactions of Haloalkanes172
- Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination239
- Ch. 14 - Structural Identification I: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification II: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution I: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution II: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems I: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems II: Pericyclic Reactions54
- Ch. 23 - Benzene I: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene II: Reactions Influenced by the Aromatic Ring62
- Ch. 25 - Amines: Structure, Reactions, and Synthesis27
- Ch. 26 - Amino Acids, Proteins, and Peptide Synthesis9
- Ch. 27 - Carbohydrates, Nucleic Acids, and Lipids54
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
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Mullins 1st EditionCh. 8 - Alkenes I: Properties and Electrophilic AdditionsProblem 61g(vi)
Mullins 1st EditionCh. 8 - Alkenes I: Properties and Electrophilic AdditionsProblem 61g(vi)Chapter 7, Problem 61g(vi)
Predict the product(s) that would result when the alkenes shown here are allowed to react under the following conditions: (vi) 1. BH3 2. H2O2, NaOH
(g) 
Verified step by step guidance1
Identify the reaction type: The given reagents (1. BH₃, 2. H₂O₂, NaOH) indicate a hydroboration-oxidation reaction. This reaction is used to convert an alkene into an alcohol.
Understand the regioselectivity: Hydroboration-oxidation follows anti-Markovnikov addition, meaning the hydroxyl group (-OH) will attach to the less substituted carbon of the double bond.
Understand the stereochemistry: The addition of BH₃ occurs in a syn fashion, meaning both the boron and hydrogen add to the same side of the alkene. This stereochemistry is retained during the oxidation step, resulting in a syn addition of the hydroxyl group and hydrogen.
Apply the reaction to the given alkene: Identify the double bond in the alkene structure and determine which carbon is less substituted. Attach the hydroxyl group (-OH) to the less substituted carbon and a hydrogen atom to the more substituted carbon.
Draw the product: After determining the regioselectivity and stereochemistry, draw the final product, ensuring the hydroxyl group is on the less substituted carbon and the stereochemistry reflects syn addition.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Hydroboration-Oxidation
Hydroboration-oxidation is a two-step reaction process used to convert alkenes into alcohols. In the first step, borane (BH₃) adds across the double bond of the alkene, resulting in a trialkylborane intermediate. The second step involves oxidation with hydrogen peroxide (H₂O₂) in the presence of a base (NaOH), which converts the boron atom into a hydroxyl group, yielding an alcohol.
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General properties of hydroboration-oxidation.
Regioselectivity
Regioselectivity refers to the preference of a chemical reaction to yield one structural isomer over others when multiple products are possible. In hydroboration, the addition of borane occurs in a syn manner, favoring the formation of the less substituted alcohol due to the anti-Markovnikov rule, where the hydroxyl group ends up on the less substituted carbon of the alkene.
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Stereochemistry
Stereochemistry is the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the hydroboration-oxidation process, the syn addition of BH₃ leads to specific stereochemical outcomes in the final alcohol product, which can influence the reactivity and properties of the resulting compound.
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Related Practice
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Predict the product(s) that would result when the alkenes shown here are allowed to react under the following conditions: (iii) HBr, H2O2
(k)
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(k)
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