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Suggest reagents to carry out the following transformations. Some may require more than one step.
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Ch. 25 - Amines: Structure, Reactions, and Synthesis
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. 25 - Amines: Structure, Reactions, and SynthesisProblema 57
Mullins 1st EditionCh. 25 - Amines: Structure, Reactions, and SynthesisProblema 57Capitolo 24, Problema 57
The Gabriel synthesis is most frequently done with 1° alkyl halides. Why is it less successful with more substituted halides?
Guida verificata passo dopo passo1
Understand the Gabriel synthesis: It is a method used to synthesize primary amines from primary alkyl halides using phthalimide as a nitrogen source.
Recognize the mechanism: The synthesis involves the nucleophilic substitution of the alkyl halide by the phthalimide anion, forming an N-alkylphthalimide intermediate.
Consider steric hindrance: More substituted alkyl halides, such as secondary or tertiary halides, have increased steric hindrance, which can impede the nucleophilic attack by the phthalimide anion.
Evaluate the reaction type: The Gabriel synthesis typically involves an SN2 reaction mechanism, which is less favorable with sterically hindered substrates due to the backside attack requirement.
Conclude the effect of substitution: As the degree of substitution on the alkyl halide increases, the efficiency of the Gabriel synthesis decreases due to steric hindrance and the reduced likelihood of successful SN2 reactions.
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Gabriel Synthesis
The Gabriel synthesis is a method used to synthesize primary amines from primary alkyl halides. It involves the use of phthalimide as a nitrogen source, which reacts with the alkyl halide to form an N-alkylphthalimide intermediate. This intermediate is then hydrolyzed to yield the primary amine. The reaction is particularly suited for primary alkyl halides due to their reactivity and lack of steric hindrance.
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04:53
General Reaction
Steric Hindrance
Steric hindrance refers to the prevention of chemical reactions due to the size of groups within a molecule. In the context of the Gabriel synthesis, more substituted alkyl halides, such as secondary or tertiary halides, have larger groups attached to the carbon bearing the halide. This bulkiness can impede the nucleophilic attack by the phthalimide ion, making the reaction less successful compared to primary alkyl halides.
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02:53Understanding steric effects.
SN2 Reaction Mechanism
The SN2 mechanism is a bimolecular nucleophilic substitution reaction where the nucleophile attacks the electrophilic carbon from the opposite side of the leaving group, resulting in an inversion of configuration. This mechanism is favored by primary alkyl halides due to minimal steric hindrance. In the Gabriel synthesis, the phthalimide ion acts as the nucleophile, and the reaction is less effective with more substituted halides because steric hindrance hinders the backside attack required for SN2 reactions.
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08:33Drawing the SN2 Mechanism
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