Domanda del libro di testo
Unlike hydroboration–oxidation, the addition of H2O catalyzed by H3O+ is not stereospecific. Thinking carefully about the mechanism of the reaction, give two reasons why.
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Ch. 8 - Alkenes 1: Properties and Electrophilic Additions
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- 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 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: 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 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: 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: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 8 - Alkenes 1: Properties and Electrophilic AdditionsProblema 55d
Mullins 1st EditionCh. 8 - Alkenes 1: Properties and Electrophilic AdditionsProblema 55dCapitolo 7, Problema 55d
Suggest an alkene to undergo hydroboration–oxidation (1. BH3 2. NaOH, H2O2) to give exclusively the alcohols shown. Pay close attention to the relative (but not absolute) stereochemical outcome.
(d) 
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Identify the alcohol product(s) formed after hydroboration–oxidation. Hydroboration–oxidation of an alkene results in an anti-Markovnikov addition of water, where the hydroxyl group (-OH) attaches to the less substituted carbon of the double bond.
Analyze the stereochemistry of the alcohol product(s). Hydroboration–oxidation proceeds with syn addition, meaning that the hydrogen (H) and hydroxyl group (-OH) are added to the same face of the alkene. This stereochemical outcome must be considered when proposing the starting alkene.
Propose a potential alkene structure. The starting alkene should have a double bond positioned such that the anti-Markovnikov addition of water leads to the observed alcohol product(s) with the correct stereochemistry.
Verify the stereochemical relationship between the proposed alkene and the alcohol product(s). Ensure that the syn addition mechanism of hydroboration–oxidation aligns with the relative stereochemistry of the alcohol product(s).
Confirm that the proposed alkene is consistent with the reaction conditions and the exclusive formation of the given alcohol product(s). If necessary, adjust the structure of the alkene to ensure it matches the observed outcome.
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Hydroboration-Oxidation
Hydroboration-oxidation is a two-step reaction that converts 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 a basic solution, which replaces the boron atom with a hydroxyl group, yielding an alcohol. This reaction is notable for its syn-addition mechanism, leading to specific stereochemical outcomes.
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General properties of hydroboration-oxidation.
Stereochemistry
Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the context of hydroboration-oxidation, the reaction proceeds with syn-addition, meaning that the boron and hydrogen atoms add to the same side of the double bond. This results in a specific stereochemical configuration of the resulting alcohol, which is crucial for predicting the product's properties and reactivity.
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Percorso guidato
1:38Polymer Stereochemistry Concept 1
Regioselectivity
Regioselectivity is the preference of a chemical reaction to yield one structural isomer over others when multiple possibilities exist. In hydroboration-oxidation, the boron atom adds to the less substituted carbon of the alkene, leading to the formation of the more stable, less sterically hindered alcohol. Understanding regioselectivity is essential for predicting the outcome of the reaction and ensuring the desired alcohol is produced.
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The first step of oxymercuration–reduction is stereospecific, and yet this fact wasn't emphasized in that discussion. Show the stereospecificity of the first step for the following alkene and then explain why the stereospecificity becomes unimportant after the second step.
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Suggest an alkene to undergo hydroboration–oxidation (1. BH3 2. NaOH, H2O2) to give exclusively the alcohols shown. Pay close attention to the relative (but not absolute) stereochemical outcome.
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(e)
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Predict the products you would get when the following alkenes undergo (i) hydroboration–oxidation (1. BH3 2. NaOH, H2O2 or (ii) oxymercuration–reduction [1. Hg(OAc)2, H2O 2. NaBH4].
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