Textbook Question
Cyclopropanation using any of the reagents discussed here is stereospecific.
(a) What does this say about the mechanism?
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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 12c
Predict the product of the following aldehyde and ketone addition reactions.
(c) 
Verified step by step guidance1
Identify the functional groups in the starting material. The molecule contains a ketone group, which is characterized by a carbonyl group (C=O) bonded to two carbon atoms.
Recognize the reagent used in the reaction. CH₃MgBr is a Grignard reagent, which is a source of nucleophilic methyl anion (CH₃⁻). It is used to add carbon groups to carbonyl compounds.
Understand the mechanism of the reaction. The Grignard reagent will attack the electrophilic carbon atom of the carbonyl group in the ketone, forming a new carbon-carbon bond.
Consider the solvent and conditions. THF is a common solvent for Grignard reactions, providing a suitable environment for the reaction to proceed. The subsequent addition of H₃O⁺ (acidic quench) will protonate the alkoxide intermediate formed after the Grignard addition.
Predict the product. The reaction will result in the formation of a tertiary alcohol, where the methyl group from the Grignard reagent is added to the carbonyl carbon, and the oxygen is converted into an alcohol group after protonation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Aldol Condensation
Aldol condensation is a reaction between aldehydes and ketones that involves the formation of a β-hydroxy aldehyde or ketone, followed by dehydration to yield an α,β-unsaturated carbonyl compound. This reaction is significant in organic synthesis as it allows for the formation of larger carbon skeletons and can lead to complex molecules.
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Nucleophilic Addition
Nucleophilic addition is a fundamental reaction mechanism in organic chemistry where a nucleophile attacks an electrophilic carbon atom, typically in carbonyl compounds like aldehydes and ketones. This process is crucial for understanding how these compounds react to form new bonds and products, influencing the overall reaction pathway.
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Reaction Mechanism
A reaction mechanism describes the step-by-step sequence of elementary reactions by which overall chemical change occurs. Understanding the mechanism of aldehyde and ketone reactions is essential for predicting products, as it reveals how reactants interact, the formation of intermediates, and the final products of the reaction.
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Related Practice
Textbook Question
Using the epoxide shown, addition of an organolithium reagent, when followed by an acid quench, produces only the starting epoxy alcohol. Why? How could the reaction be modified to produce the desired molecule? [Hint: Look back at Section 13.14.]
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Textbook Question
Predict the product of the following aldehyde and ketone addition reactions.
(a)
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Textbook Question
Predict the product of the following aldehyde and ketone addition reactions.
(b)
Textbook Question
Provide an arrow-pushing mechanism for the cyclopropanation of cyclohexene with methylene carbene. Rationalize the outcome.
Textbook Question
Estimate the value of entropy (∆S > 0 or ∆S < 0) for the elimination step shown.