Textbook Question
Based on the stereochemical result alone, how can you tell that this reaction does not proceed by an Sₙ2 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 35
Suggest a synthesis of the following molecule starting with the reagents shown, using cuprate cross-coupling as the key step.
Verified step by step guidance1
Identify the key transformation needed: The target molecule is formed by connecting the aromatic ring of the iodide compound to the alkyl chain of the alcohol. This suggests a cross-coupling reaction.
Prepare the organocuprate reagent: Convert the alcohol into an organometallic compound. This can be done by first converting the alcohol to a halide (e.g., using PBr3 to form the corresponding alkyl bromide), and then reacting it with a copper(I) reagent to form the organocuprate.
Perform the cuprate cross-coupling: Use the organocuprate reagent to perform a cross-coupling reaction with the aryl iodide. This step will form the carbon-carbon bond between the aromatic ring and the alkyl chain.
Consider the reaction conditions: Ensure that the reaction is carried out under conditions suitable for cuprate coupling, typically involving a polar aprotic solvent and low temperatures to stabilize the organocuprate.
Verify the synthesis: Analyze the structure of the product to ensure that the desired carbon-carbon bond has been formed and that the overall structure matches the target molecule.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Cuprate Cross-Coupling
Cuprate cross-coupling is a reaction involving organocopper reagents, typically lithium diorganocopper reagents, which react with electrophiles to form carbon-carbon bonds. This method is particularly useful for synthesizing complex organic molecules due to its ability to couple a wide range of substrates, including aryl and vinyl halides. Understanding the mechanism and conditions for this reaction is crucial for effectively utilizing it in synthetic pathways.
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Cross-Coupling Reaction Mechanisms
Reagents and Reaction Conditions
The choice of reagents and reaction conditions is vital in organic synthesis, as they dictate the feasibility and efficiency of the desired transformation. In the context of cuprate cross-coupling, selecting the appropriate organocopper reagent and ensuring optimal conditions, such as temperature and solvent, can significantly influence the yield and selectivity of the product. Familiarity with the reactivity of different functional groups is essential for successful synthesis.
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Synthetic Strategy and Retrosynthesis
Synthetic strategy involves planning a sequence of reactions to construct a target molecule from simpler starting materials. Retrosynthesis is a technique used to work backward from the target molecule to identify suitable precursors and intermediates. This approach is critical in organic chemistry, as it helps chemists visualize the pathway to synthesize complex molecules, including the necessary reactions from previous chapters, such as those in Chapter 13.
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Related Practice
Textbook Question
Predict the product of the diorganocuprate cross-coupling reactions shown.
(b)
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Textbook Question
Predict the product of the following epoxide opening reactions.
(a)
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Textbook Question
Predict the product of the following epoxide opening reactions.
(b)
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Textbook Question
The situation shown here is an example where a cuprate is the only organometallic that will allow the product alcohol to be obtained. What is the problem with using a Grignard or an organolithium to attempt the same reaction?
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Textbook Question
Predict the product of the diorganocuprate cross-coupling reactions shown.
(c)
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