Domanda del libro di testo
A chemist failed to generate the alcohol using the reaction shown here.
(b) How could the reaction conditions be modified to allow formation of the product?
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Ch. 16 - Metals in Organic Chemistry
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
Capitolo 15, Problema 42
Which of the following solvents are reasonable choices for a Grignard reaction? Justify your choices. [Hint: Carbonyls are good electrophiles.]
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Grignard reagents are highly reactive organomagnesium compounds that are sensitive to moisture and protic solvents. Therefore, the choice of solvent is crucial for the success of a Grignard reaction.
The first structure is tetrahydrofuran (THF), a cyclic ether. Ethers are generally good solvents for Grignard reactions because they can stabilize the Grignard reagent through coordination with the oxygen atom, and they do not contain acidic protons that would react with the Grignard reagent.
The second structure is ethyl acetate, an ester. Esters are not suitable solvents for Grignard reactions because they contain a carbonyl group, which is a good electrophile and would react with the Grignard reagent, leading to unwanted side reactions.
The third structure is ethanol, an alcohol. Alcohols are protic solvents and contain acidic protons that would react with the Grignard reagent, destroying it. Therefore, ethanol is not a suitable solvent for Grignard reactions.
The fourth structure is diethyl ether, a common solvent for Grignard reactions. Like THF, diethyl ether is an aprotic solvent that can stabilize the Grignard reagent without reacting with it. It is often used in Grignard reactions due to its ability to dissolve both the Grignard reagent and the organic substrate.
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Grignard Reagents
Grignard reagents are organomagnesium compounds that are highly reactive and serve as nucleophiles in organic synthesis. They are formed by reacting alkyl or aryl halides with magnesium metal in anhydrous ether. Their reactivity allows them to attack electrophiles, such as carbonyl compounds, making them essential in forming new carbon-carbon bonds.
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02:12
Carbonation of Grignard Reagents
Solvent Properties
The choice of solvent in a Grignard reaction is critical because Grignard reagents are sensitive to moisture and can react with protic solvents, leading to their decomposition. Suitable solvents are typically non-polar and aprotic, such as diethyl ether or tetrahydrofuran (THF), which can stabilize the Grignard reagent without participating in the reaction.
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01:16Identification of polarity in solvents
Electrophilicity of Carbonyls
Carbonyl compounds, such as aldehydes and ketones, are good electrophiles due to the polarized carbon-oxygen double bond, where the carbon atom carries a partial positive charge. This makes them susceptible to nucleophilic attack by Grignard reagents, facilitating the formation of alcohols after subsequent hydrolysis. Understanding this reactivity is crucial for predicting the outcomes of Grignard reactions.
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04:20Carboxylic Acids Nomenclature
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A chemist failed to generate the diol using the reaction shown here.
(a) Suggest a reason why this reaction did not work as written.
(b) How could the reaction conditions be modified to allow formation of the diol? [It may require more than one step.]
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