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Preparation of 1° Amines: Gabriel Synthesis

Preparation of 1° Amines: Gabriel Synthesis

Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...

Preparation of Amides

Preparation of Amides

Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...

Preparation of 1° Amines: Azide Synthesis

Preparation of 1° Amines: Azide Synthesis

Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction

α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.

Step-Growth Polymerization: Overview

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Recent Developments in Amide Synthesis Using Nonactivated Starting Materials.

Andrea Ojeda-Porras¹, Diego Gamba-Sánchez¹

¹Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes , Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia.

The Journal of Organic Chemistry

|December 10, 2016

Summary

This summary is machine-generated.

This study reviews recent, eco-friendly amide synthesis methods. It highlights innovative techniques for creating important molecules like peptides and pharmaceuticals from various starting materials.

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Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

Amides are crucial functional groups found in peptides, pharmaceuticals, proteins, and alkaloids.
Traditional amide synthesis methods can be inefficient and environmentally taxing.

Purpose of the Study:

To survey recent advancements in amide synthesis.
To highlight innovative and eco-friendly methodologies.
To focus on developments within the past two years.

Main Methods:

Review of recent literature on amide synthesis.
Focus on methods utilizing nonactivated carboxylic acids, derivatives, and noncarboxylic compounds.
Emphasis on green chemistry principles and innovative catalytic approaches.

Main Results:

Identification of novel amide synthesis strategies.
Demonstration of more sustainable and efficient synthetic routes.
Comparison of new methods with traditional amide formation techniques.

Conclusions:

Recent developments offer greener and more efficient pathways for amide synthesis.
Innovative methodologies are expanding the scope of accessible amide-containing molecules.
The field is moving towards more sustainable practices in organic synthesis.