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?
(c)
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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 24
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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Step 1: The reaction begins with the formation of an epoxide from the alkene. This occurs via the reaction of the alkene with a peracid (persulfonic acid in this case), which transfers an oxygen atom to the double bond, forming a three-membered epoxide ring. This step is stereospecific and retains the stereochemistry of the starting alkene.
Step 2: The epoxide undergoes an acid-base reaction in the presence of the sulfonic acid catalyst. The oxygen in the epoxide ring is protonated, making the ring more electrophilic and susceptible to nucleophilic attack.
Step 3: The protonated epoxide is opened by water, which acts as a nucleophile. The attack can occur at either carbon of the epoxide ring, leading to the formation of two different enantiomers. The stereochemistry of the product depends on the direction of the nucleophilic attack.
Step 4: The resulting intermediate undergoes a second acid-base reaction, where a proton is transferred to regenerate the sulfonic acid catalyst. This step ensures the catalytic cycle continues.
Step 5: The final products are two enantiomers of the diol, formed as a result of the stereospecific opening of the epoxide ring. The persulfonic acid is regenerated in the process, completing the catalytic cycle.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Enantiomers
Enantiomers are a type of stereoisomer that are non-superimposable mirror images of each other. They have the same molecular formula and connectivity but differ in the spatial arrangement of atoms. This property is crucial in organic chemistry, especially in reactions involving chiral centers, as enantiomers can exhibit different biological activities and reactivities.
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Chirality
Chirality refers to the geometric property of a molecule that makes it non-superimposable on its mirror image. A chiral molecule typically has at least one carbon atom bonded to four different substituents, creating two distinct configurations. Understanding chirality is essential for predicting the formation of enantiomers in chemical reactions, as it influences how molecules interact with other chiral environments.
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Reaction Mechanisms
A reaction mechanism is a step-by-step description of the process by which reactants are converted into products. It outlines the sequence of bond-breaking and bond-forming events, including the formation of intermediates and transition states. In the context of enantiomer formation, understanding the mechanism helps in identifying how each enantiomer is produced and the role of stereochemistry in the reaction.
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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)
1
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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
Show an arrow-pushing mechanism for reactions 1–4 in Figure 9.37.
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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)
2
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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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