Textbook Question
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(c)
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Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones
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. 17 - Carbonyl Addition Reactions: Aldehydes and KetonesProblem 66b
Mullins 1st EditionCh. 17 - Carbonyl Addition Reactions: Aldehydes and KetonesProblem 66bChapter 16, Problem 66b
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(b) 
Verified step by step guidance1
Identify the functional groups in the starting material and the target molecule. The starting material is an aldehyde, and the target molecule has an additional ether group and a longer carbon chain.
Select a protecting group for the aldehyde to prevent it from reacting during the chain extension process. A common choice is the acetal protecting group, which can be formed by reacting the aldehyde with an alcohol in the presence of an acid catalyst.
Extend the carbon chain by performing a Grignard reaction. First, convert the alkyl halide to a Grignard reagent, then react it with the protected aldehyde to form the extended carbon chain.
Introduce the ether group by performing a Williamson ether synthesis. This involves reacting an alcohol with an alkyl halide in the presence of a base to form the ether linkage.
Finally, remove the protecting group to regenerate the aldehyde functionality. This can be done by hydrolysis of the acetal under acidic conditions, yielding the target molecule.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Protecting Groups
Protecting groups are temporary modifications used in organic synthesis to prevent certain functional groups from reacting during a chemical transformation. They allow chemists to selectively modify other parts of a molecule without interference. After the desired reactions are completed, the protecting group can be removed to restore the original functional group.
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Protecting Groups
Synthetic Pathway
A synthetic pathway is a series of chemical reactions that lead to the formation of a desired product from a starting material. It involves strategic planning to determine the order of reactions, the reagents needed, and the conditions required to achieve the target molecule efficiently. Understanding the reactivity and compatibility of different functional groups is crucial in designing an effective synthetic pathway.
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Functional Group Interconversion
Functional group interconversion refers to the transformation of one functional group into another within a molecule. This concept is essential in organic synthesis as it allows chemists to modify the reactivity and properties of a compound. Mastery of various reactions that facilitate these conversions is vital for constructing complex molecules and achieving specific synthetic goals.
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Related Practice
Textbook Question
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(a)
1
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Textbook Question
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(d)
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Textbook Question
As discussed in Section 17.9.1, alkenes can be hydrogenated selectively in the presence of ketones. Suppose that was not the case, and suggest how you might use a protecting group strategy to generate A from B.
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Textbook Question
In lieu of quenching the product of Grignard addition to a carbonyl with acid, alkyl halides can be added directly to generate ether products. Predict the product and show the mechanism of this process.
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Textbook Question
Starting with formaldehyde and the alkyl halides shown as the only sources of carbon, provide a synthesis of the following alcohol.
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