Textbook Question
Predict the products you would get when the following alkenes react under the following conditions: (i) H2SO4, H2O and (ii) 1. Hg(OAc)2, H2O , 2. NaBH4
(c)
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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 50a(ii)
Mullins 1st EditionCh. 8 - Alkenes I: Properties and Electrophilic AdditionsProblem 50a(ii)Chapter 7, Problem 50a(ii)
Predict the products you would get when the following alkenes react under the following conditions: (ii) 1. Hg(OAc)2 , H2O , 2. NaBH4
(a) 
Verified step by step guidance1
Identify the reaction type: The given reagents (Hg(OAc)₂, H₂O, followed by NaBH₄) indicate an oxymercuration-demercuration reaction. This reaction is used to hydrate alkenes (add H and OH) without carbocation rearrangement.
Analyze the alkene structure: Determine the position of the double bond in the given alkene. The double bond will dictate where the addition of H and OH occurs.
Understand the regioselectivity: Oxymercuration-demercuration follows Markovnikov's rule, meaning the OH group will add to the more substituted carbon of the double bond, while the H will add to the less substituted carbon.
Write the intermediate: In the first step, Hg(OAc)₂ reacts with the alkene to form a mercurinium ion intermediate. Water (H₂O) then attacks the more substituted carbon of the mercurinium ion, leading to the formation of an organomercury intermediate.
Complete the reaction: In the second step, NaBH₄ reduces the organomercury intermediate, replacing the Hg(OAc) group with a hydrogen atom. The final product is an alcohol with the OH group on the more substituted carbon and the H on the less substituted carbon.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Markovnikov's Rule
Markovnikov's Rule states that in the addition of HX to an alkene, the hydrogen atom (H) will attach to the carbon with the greater number of hydrogen atoms already attached, while the halide (X) will attach to the carbon with fewer hydrogen atoms. This principle helps predict the regioselectivity of electrophilic additions, which is crucial for understanding the products formed in reactions involving alkenes.
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Oxymercuration-Demercuration
Oxymercuration-Demercuration is a two-step reaction process used to convert alkenes into alcohols. In the first step, an alkene reacts with mercuric acetate (Hg(OAc)₂) and water, leading to the formation of an intermediate that follows Markovnikov's addition. The second step involves the reduction of this intermediate with sodium borohydride (NaBH₄), which replaces the mercury with a hydrogen atom, yielding the final alcohol product.
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05:General properties of oxymercuration-reduction.
Stereochemistry of Alkene Reactions
Stereochemistry refers to the spatial arrangement of atoms in molecules and is crucial in organic reactions. In the case of oxymercuration, the reaction can lead to the formation of both syn and anti products due to the nature of the addition. Understanding stereochemistry helps predict the specific isomers that may be produced, which is important for determining the overall outcome of the reaction.
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Related Practice
Textbook Question
Predict the products you would get when the following alkenes react under the following conditions: (i) H2SO4, H2O and (ii) 1. Hg(OAc)2, H2O , 2. NaBH4
(d)
1
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Textbook Question
Provide a mechanism for the following reactions occurring with rearrangement.
(b)
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Textbook Question
Predict the products you would get when the following alkenes react under the following conditions: (i) H2SO4 , H2O
(a)
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Textbook Question
Our wayward chemist from Assessment 8.23 suggested the following stepwise mechanism for a hydride shift. Show this mechanism on a reaction coordinate diagram to illustrate why the concerted mechanism is more likely. Justify the picture you have drawn.
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Textbook Question
The hydration of three C5H10 alkene isomers can give 2-methylbutan-2-ol. Draw them.
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