Domanda del libro di testo
Benzyl ethers make excellent protecting groups according to the general scheme shown here.
(a) How would you protect the 1° alcohol as a benzyl ether in the first step?
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Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471
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TOC.tableOfContents
- 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 1: Properties and Electrophilic Additions158
- Ch. 9 - Alkenes 2: 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 1: Infrared Spectroscopy and Mass Spectrometry54
- Ch. 15 - Structural Identification 2: Nuclear Magnetic Resonance Spectroscopy93
- Ch. 16 - Metals in Organic Chemistry48
- Ch. 17 - Carbonyl Addition Reactions: Aldehydes and Ketones45
- Ch. 18 - Nucleophilic Acyl Substitution 1: Carboxylic Acids18
- Ch. 19 - Nucleophilic Acyl Substitution 2: Carboxylic Acid Derivatives39
- Ch. 20 - Enolates: Carbonyl Addition and Substitution13
- Ch. 21 - Conjugated Systems 1: Stability and Addition Reactions56
- Ch. 22 - Conjugated Systems 2: Pericyclic Reactions54
- Ch. 23 - Benzene 1: Aromatic Stability and Substitution Reactions64
- Ch. 24 - Benzene 2: 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: 9780137566471Non è quello che usi tu?Cambia libro di testo
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Mullins 1st EditionCh. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblema 114
Mullins 1st EditionCh. 13 - Alcohols, Ethers and Related Compounds: Substitution and EliminationProblema 114Capitolo 12, Problema 114
A chemist attempted the reaction below, one we introduce in Chapter 17, expecting the reaction between a strong nucleophile and a ketone in water to give an alkoxide product.
(a) Why did the reaction fail?
(b) How could the reaction conditions be changed to give a successful reaction?
Guida verificata passo dopo passo1
Identify the reactants and the expected product in the reaction. The reactants are a Grignard reagent (isopropylmagnesium bromide) and a ketone (acetone), and the expected product is an alkoxide.
Understand the role of the Grignard reagent. Grignard reagents are strong nucleophiles and bases, which typically react with carbonyl compounds to form alcohols after hydrolysis.
Analyze why the reaction failed. The presence of water in the reaction mixture is problematic because Grignard reagents react with water to form alkanes, thus deactivating the Grignard reagent before it can react with the ketone.
Consider how to modify the reaction conditions. To successfully carry out the reaction, the Grignard reagent should be reacted with the ketone in an anhydrous (water-free) environment to prevent its deactivation.
Propose a solution. Use an inert, dry solvent such as diethyl ether or tetrahydrofuran (THF) to perform the reaction, and ensure that all glassware and reagents are dry to prevent any moisture from interfering with the reaction.
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Nucleophilicity
Nucleophilicity refers to the ability of a nucleophile to donate an electron pair to an electrophile, facilitating a chemical reaction. Strong nucleophiles, such as alkoxides or amines, are more reactive and can effectively attack electrophilic centers like carbonyls in ketones. Understanding the strength and nature of the nucleophile is crucial in predicting the outcome of reactions involving ketones.
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08:27
Nucleophilic Addition
Ketone Reactivity
Ketones are characterized by a carbonyl group (C=O) flanked by two carbon atoms. Their reactivity is influenced by the electrophilic nature of the carbonyl carbon, which can be attacked by nucleophiles. However, the presence of steric hindrance or electronic effects from substituents can affect the reaction's feasibility, making it essential to consider these factors when predicting reaction outcomes.
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02:27Name the ketone
Reaction Conditions
Reaction conditions, including solvent, temperature, and concentration, play a critical role in determining the success of a chemical reaction. In the case of a nucleophilic attack on a ketone, using a polar protic solvent like water can stabilize the nucleophile and the transition state, but may also lead to unwanted side reactions. Adjusting these conditions, such as using a non-protic solvent or altering the temperature, can enhance the likelihood of a successful reaction.
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Percorso guidato
1:18EAS Reactions of Pyridine Example 1
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