Textbook Question
There are two mechanisms by which each of the two enantiomers can form in the reaction shown in Figure 9.37. Show them.
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Ch. 9 - Alkenes II: Oxidation and Reduction
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 8, Problem 25
Show an arrow-pushing mechanism for reactions 1–4 in Figure 9.37.
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Verified step by step guidance1
Step 1: Epoxidation - The alkene reacts with the persulfonic acid (R-SO3H) to form an epoxide. The oxygen from the persulfonic acid is transferred to the double bond of the alkene, forming a three-membered cyclic ether (epoxide). This step involves the movement of electrons from the double bond to the oxygen atom.
Step 2: Acid-base reaction - The epoxide undergoes protonation by the sulfonic acid (R-SO3H), which donates a proton (H+) to the oxygen atom of the epoxide. This protonation makes the epoxide more electrophilic and susceptible to nucleophilic attack.
Step 3: Epoxide opening - Water (H2O) acts as a nucleophile and attacks the protonated epoxide. The nucleophilic attack leads to the opening of the three-membered ring, resulting in the formation of a diol (two hydroxyl groups on adjacent carbons). This step involves the movement of electrons from the water molecule to the carbon atom of the epoxide.
Step 4: Acid-base reaction - The newly formed diol undergoes deprotonation by the sulfonic acid, regenerating the sulfonic acid and stabilizing the diol product. This step involves the transfer of a proton from the diol to the sulfonic acid.
Step 5: Regeneration of persulfonic acid - Hydrogen peroxide (H2O2) reacts with the sulfonic acid to regenerate the persulfonic acid (R-SO3H), completing the catalytic cycle. This step ensures that the catalyst is available for further reactions.
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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 mechanisms are diagrams used in organic chemistry to illustrate the movement of electrons during chemical reactions. Arrows indicate the direction of electron flow, showing how bonds are formed and broken. Understanding this mechanism is crucial for predicting the outcome of reactions and visualizing the transition states involved.
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General Mechanism
Reaction Mechanisms
A reaction mechanism is a step-by-step description of the process by which reactants are converted into products. It includes details about the intermediates formed, the transition states, and the energy changes throughout the reaction. Familiarity with different types of mechanisms, such as nucleophilic substitutions or electrophilic additions, is essential for analyzing complex reactions.
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Functional Groups
Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups is vital for understanding how different compounds will react in a given mechanism. They dictate the reactivity and properties of organic compounds, influencing the overall reaction pathway.
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Related Practice
Textbook Question
Which of molecules A–D would you expect to give a positive permanganate test? That is, which would result in a purple KMnO₄ solution turning brown?
(d)
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Textbook Question
Predict the product(s) of each of the following reactions, making sure to indicate the relative stereochemical outcome. Indicate any racemic mixtures by drawing both enantiomers.
(b)
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Textbook Question
Predict the product(s) of each of the following reactions, making sure to indicate the relative stereochemical outcome. Indicate any racemic mixtures by drawing both enantiomers.
(c)
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Textbook Question
Predict the product(s) of each of the following reactions, making sure to indicate the relative stereochemical outcome. Indicate any racemic mixtures by drawing both enantiomers.
(a)
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Textbook Question
The concertedness of the OsO4 reaction results in both oxygens being added to the same face of the molecule (i.e., syn addition). How might these conditions be modified in order to prepare a trans-diol?
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