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 66d
Mullins 1st EditionCh. 17 - Carbonyl Addition Reactions: Aldehydes and KetonesProblem 66dChapter 16, Problem 66d
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(d) 
Verified step by step guidance1
Identify the functional groups in the starting material and the target molecule. The starting material is a secondary alcohol, and the target molecule is an aldehyde with an additional carbon chain.
Recognize that the primary alcohol in the starting material needs to be protected to prevent it from reacting during the oxidation step. Use a protecting group such as a silyl ether (e.g., TBSCl) to protect the alcohol.
Perform a Grignard reaction to extend the carbon chain. First, convert the terminal alkene to a Grignard reagent using magnesium in dry ether. Then, react it with formaldehyde to introduce an additional carbon and form a primary alcohol.
Oxidize the newly formed primary alcohol to an aldehyde using a mild oxidizing agent such as PCC (Pyridinium chlorochromate).
Finally, remove the protecting group from the original alcohol using a fluoride source like TBAF (Tetrabutylammonium fluoride) to regenerate the free alcohol group.
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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 designed to convert starting materials into a desired product. It involves strategic planning to determine the order of reactions, the choice of reagents, and the conditions required for each step. Understanding the synthetic pathway is crucial for efficiently synthesizing complex molecules.
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Functional Group Interconversion
Functional group interconversion refers to the process of transforming 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 key to designing effective synthetic routes.
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Related Practice
Textbook Question
We show in Chapter 20 that α , β-unsaturated ketones are electrophilic at C4. Rationalize this observation.
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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.
(a)
999
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Textbook Question
When a ketone is dissolved in 18O-labeled water, the 18O label is incorporated into the ketone. Suggest a mechanism that explains this observation.
875
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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
Suggest a synthetic scheme, involving a protecting group, to generate the molecule shown starting with the molecule at the left.
(b)
806
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