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)
1
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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
Chapter 7, Problem 51
Provide an arrow-pushing mechanism, accounting also for the stereochemical outcome, of the first step (oxymercuration) of the three reactions in Figure 8.63.
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Begin by identifying the alkene substrate involved in the oxymercuration reaction. The alkene will undergo electrophilic addition, where the π bond acts as a nucleophile.
In the oxymercuration step, the alkene reacts with mercuric acetate (Hg(OAc)₂). The π electrons of the alkene attack the mercury atom, forming a mercurinium ion intermediate. Use curved arrows to show the movement of electrons from the π bond to the mercury atom.
The mercurinium ion is a cyclic intermediate where the mercury atom is bonded to both carbons of the former double bond. This intermediate is crucial for understanding the stereochemical outcome, as it dictates the regioselectivity of the subsequent nucleophilic attack.
Next, consider the nucleophilic attack by water (H₂O) on the more substituted carbon of the mercurinium ion. This attack opens the ring and leads to the formation of an organomercury alcohol. Use curved arrows to show the movement of electrons from the water molecule to the more substituted carbon.
Finally, account for the stereochemical outcome. The nucleophilic attack occurs from the side opposite to the mercury atom, leading to anti addition. This results in the formation of a trans product, where the hydroxyl group and the mercury acetate group are on opposite sides of the former double bond.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Arrow-Pushing Mechanism
Arrow-pushing is a technique used in organic chemistry to depict the movement of electrons during chemical reactions. It involves using curved arrows to show how electron pairs move from nucleophiles to electrophiles, helping to visualize the step-by-step transformation of reactants into products. Understanding this concept is crucial for predicting reaction pathways and outcomes.
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General Mechanism
Oxymercuration Reaction
Oxymercuration is a chemical reaction that involves the addition of mercury(II) acetate to an alkene, followed by nucleophilic attack by water, resulting in the formation of an alcohol. This reaction proceeds via a cyclic mercurinium ion intermediate, which is key to understanding the stereochemical aspects of the reaction. It is important for synthesizing alcohols with Markovnikov regioselectivity without carbocation rearrangement.
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Stereochemical Outcome
Stereochemistry refers to the spatial arrangement of atoms in molecules and its impact on chemical reactions. In oxymercuration, the stereochemical outcome is influenced by the formation of the mercurinium ion, which dictates the orientation of the nucleophilic attack. Understanding stereochemistry is essential for predicting the configuration of the final product, which can affect its physical and chemical properties.
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Related Practice
Textbook Question
Oxymercuration–reduction, like acid-catalyzed hydration, can be modified to synthesize ethers. Suggest an alkene and the appropriate reaction conditions to synthesize the following ethers.
(a)
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 an arrow-pushing mechanism, accounting also for the stereochemical outcome, of the first step (oxymercuration) of the three reactions in Figure 8.63.
1
views
Textbook Question
Predict the products you would get when the following alkenes react under the following conditions: (i) H2SO4 , H2O
(a)
1
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Textbook Question
Which is more stable, a carbocation or a mercurinium ion? How do you know?
1
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