Textbook Question
Predict the product of the following reactions.
(a)
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Ch. 16 - Metals in Organic Chemistry
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 15, Problem 21
Suggest a mechanism for the reaction shown in Figure 16.30 using IZnCH₂I as the cyclopropanating reagent.
Verified step by step guidance1
Identify the starting materials and the reagent: The reaction involves a substrate with a double bond and the reagent IZnCH₂I, which is a cyclopropanating agent.
Understand the role of IZnCH₂I: This reagent is used to form cyclopropane rings by inserting a CH₂ group across a double bond. The zinc (Zn) acts as a stabilizing metal center that facilitates the transfer of the CH₂ group.
Initiate the mechanism by forming a carbenoid: The IZnCH₂I reagent can be thought of as generating a carbenoid species, which is a reactive intermediate similar to a carbene but stabilized by the metal (Zn).
Propose the interaction with the double bond: The carbenoid species will interact with the π electrons of the double bond in the substrate. This interaction leads to the formation of a three-membered cyclopropane ring.
Conclude the mechanism: The cyclopropanation is completed when the CH₂ group is inserted across the double bond, resulting in the formation of a cyclopropane ring. The zinc iodide (ZnI₂) is released as a byproduct.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cyclopropanation Reaction
Cyclopropanation is a chemical reaction that introduces a cyclopropane ring into a molecule. It typically involves the addition of a carbene or carbenoid to an alkene, forming a three-membered ring. Understanding the nature of the cyclopropanating reagent, such as IZnCH₂I, is crucial for predicting the reaction pathway and the stereochemistry of the product.
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General properties of cyclopropanation.
Carbenoid Reagents
Carbenoid reagents, like IZnCH₂I, are compounds that mimic the behavior of carbenes, which are highly reactive species with a divalent carbon atom. These reagents facilitate the formation of cyclopropane rings by transferring a CH₂ group to an alkene. Recognizing the properties and reactivity of carbenoids helps in understanding their role in cyclopropanation reactions.
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Reaction Mechanism
A reaction mechanism outlines the step-by-step process by which reactants transform into products, detailing the movement of electrons and the formation and breaking of bonds. For cyclopropanation using IZnCH₂I, the mechanism involves the generation of a carbenoid intermediate, its interaction with the alkene, and the subsequent formation of the cyclopropane ring. Understanding mechanisms is essential for predicting reaction outcomes and designing synthetic pathways.
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Related Practice
Textbook Question
Predict the product of the following Negishi coupling reactions.
(b)
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Textbook Question
Predict the product of the following reactions.
(b)
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Textbook Question
Work backward to show how the cyclopropane would be synthesized from the chloroalkane shown.
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Textbook Question
To determine the stereochemistry of curacin A by synthesis, it would have been necessary to prepare all stereoisomers of the C₁₇―C₂₀ cyclopropane fragment. How would the reaction in Figure 16.30 be modified to produce the other stereoisomers shown here?
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Textbook Question
Predict the product of the following Negishi coupling reactions.
(a)
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