Textbook Question
Predict the product of the following reactions.
(j)
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Ch. 21 - Conjugated Systems I: Stability and Addition Reactions
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. 21 - Conjugated Systems I: Stability and Addition ReactionsProblem 60a
Mullins 1st EditionCh. 21 - Conjugated Systems I: Stability and Addition ReactionsProblem 60aChapter 20, Problem 60a
The reactivity of cyclopropanes often mimics that of alkenes.
(a) On the basis of this, suggest a mechanism for the following reaction.
Verified step by step guidance1
Understand the problem: Cyclopropanes are known to exhibit reactivity similar to alkenes due to the strain in their three-membered ring. This strain makes the C-C bonds more reactive, often undergoing reactions that resemble alkene chemistry, such as electrophilic addition or ring-opening reactions.
Analyze the reaction: Identify the reactants, products, and any reagents or conditions provided in the reaction. If the reaction involves an electrophile or nucleophile, consider how the cyclopropane might interact with it.
Propose the first step of the mechanism: If the reaction involves an electrophile (e.g., H⁺ or Br⁺), the cyclopropane can act as a nucleophile. The strained C-C bond can break, forming a carbocation intermediate. Represent this step using curved arrows to show electron movement.
Consider the intermediate: After the initial bond-breaking step, evaluate the stability of the carbocation intermediate. If possible, resonance or rearrangement may occur to stabilize the intermediate.
Propose the final step: Depending on the reaction conditions, the carbocation intermediate may react with a nucleophile (e.g., water, halide ion) to form the final product. Use curved arrows to show the nucleophilic attack and complete the mechanism.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cyclopropane Reactivity
Cyclopropanes are small cyclic alkenes that exhibit unique reactivity due to their strained three-membered ring structure. This strain makes them more reactive than typical alkenes, allowing them to undergo reactions such as ring-opening or addition reactions. Understanding this reactivity is crucial for predicting the outcomes of reactions involving cyclopropanes.
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General properties of cyclopropanation.
Mechanism of Electrophilic Addition
Electrophilic addition is a fundamental reaction mechanism in organic chemistry where an electrophile reacts with a nucleophile, leading to the formation of a more stable product. In the context of cyclopropanes, this mechanism can involve the opening of the ring and the addition of reagents across the double bond-like character of the cyclopropane, similar to how alkenes react.
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Transition States and Reaction Pathways
In organic reactions, transition states represent the highest energy state during the transformation of reactants to products. Understanding the transition states and the energy barriers involved in the reaction pathways is essential for predicting the feasibility and rate of reactions. This concept is particularly relevant when analyzing the mechanisms of cyclopropane reactions, as the strain in the ring influences these factors.
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Related Practice
Textbook Question
The following transformation was found to occur in areas with large NO₂ emissions. Suggest a mechanism for the reaction (J. Phys. Chem. 2013, 117, 14132–14140). [Hint: Use the fishhook arrows associated with radical reactions.]
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Textbook Question
The reactivity of cyclopropanes often mimics that of alkenes.
(b) Besides opening the three-membered ring, what is the driving force for this reaction?
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Textbook Question
The following reaction was used in the synthesis of aculeatin A, a natural product that is active against KB cell lines. Although it only worked under acidic conditions, a mechanism can be drawn where the reaction might proceed under basic conditions. Suggest this mechanism (J. Org. Chem. 2014, 79, 1498–1504). [The most acidic proton is indicated . . . and number your carbons!]
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Textbook Question
In Chapter 9, electron-rich alkenes were oxidized under acidic conditions with mCPBA. Conjugated alkenes can be oxidized using the same reagent, but under basic conditions. Suggest a mechanism for this reaction. [Think about what is electron-rich and what is electron-poor in the reaction. Also, identify the bonds formed and broken.]
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Textbook Question
Predict the product of the following reactions.
(i)
1043
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