Textbook Question
Predict the product of the following epoxide addition reactions.
(b)
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Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination
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. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblem 81b
Mullins 1st EditionCh. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblem 81bChapter 12, Problem 81b
A variety of organometallics, which as strong nucleophiles can react with epoxides, are introduced in Chapter 16. Predict the product of these reactions. [Hint: Assume the carbon–metal bond in each is ionic, with the carbon possessing the negative charge.]
(b) 
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Identify the organometallic reagent in the reaction. Organometallic compounds typically have a carbon-metal bond, where the carbon is nucleophilic due to its partial negative charge.
Recognize the epoxide as the electrophile in the reaction. Epoxides are three-membered cyclic ethers with significant ring strain, making them highly reactive toward nucleophiles.
Determine the site of nucleophilic attack. The nucleophile (carbon from the organometallic reagent) will attack the less sterically hindered carbon of the epoxide, leading to ring opening. This is due to the SN2-like mechanism of the reaction.
Add a protonation step. After the nucleophilic attack and ring opening, the negatively charged oxygen (from the epoxide) will be protonated by a suitable proton source (e.g., water or an acid) to form the final alcohol product.
Draw the final product. The product will be an alcohol where the nucleophile has added to the less hindered carbon of the epoxide, and the oxygen from the epoxide is now part of a hydroxyl group.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Organometallic Compounds
Organometallic compounds are molecules that contain a bond between a carbon atom of an organic group and a metal. These compounds are known for their strong nucleophilic properties, allowing them to react with electrophiles, such as epoxides. The metal can vary, influencing the reactivity and stability of the compound.
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Epoxide Reactivity
Epoxides are three-membered cyclic ethers that are highly reactive due to the strain in their ring structure. They can undergo nucleophilic attack at the less hindered carbon atom, leading to ring-opening reactions. Understanding the mechanism of this reaction is crucial for predicting the products formed when epoxides react with nucleophiles.
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02:19General properties of epoxidation.
Ionic Carbon-Metal Bond
In the context of organometallics, assuming an ionic carbon-metal bond means that the carbon atom carries a negative charge, making it a strong nucleophile. This assumption simplifies the analysis of the reaction mechanism, as it allows for straightforward predictions about how the nucleophile will interact with the electrophilic epoxide, leading to the formation of specific products.
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Related Practice
Textbook Question
A variety of organometallics, which as strong nucleophiles can react with epoxides, are introduced in Chapter 16. Predict the product of these reactions. [Hint: Assume the carbon–metal bond in each is ionic, with the carbon possessing the negative charge.]
(c)
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Textbook Question
Show how a protecting group might be used to make these reactions successful.
(a)
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Textbook Question
Reaction of the acetylide with the epoxide shown will not form the desired product. What side reaction occurs instead? Why?
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Textbook Question
Predict the product of the following epoxide addition reactions.
(a)
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Textbook Question
Predict the product of the following reactions.
(a)
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