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Preparation of Amines: Alkylation of Ammonia and Amines

Preparation of Amines: Alkylation of Ammonia and Amines

Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...

Anionic Chain-Growth Polymerization: Overview

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

Nomenclature of Secondary and Tertiary Amines

Nomenclature of Secondary and Tertiary Amines

The secondary and tertiary amines are derivatives of ammonia, where two and three of its hydrogens are replaced by alkyl groups, respectively. Secondary and tertiary amines can be symmetrical with identical alkyl groups attached to the nitrogen atom or unsymmetrical when more than one type of alkyl group is present. The standard nomenclature of secondary and tertiary amines is similar to the names given to the primary amines. They are generally named alkylamines. As depicted in Figure 1, for...

Step-Growth Polymerization: Overview

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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...

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...

Diazonium Group Substitution: –OH and –H

Diazonium Group Substitution: –OH and –H

Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.

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Related Experiment Video

Updated: Oct 2, 2025

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

Research Progress on Typical Quaternary Ammonium Salt Polymers.

Xingqin Fu^1,2, Yuejun Zhang¹, Xu Jia¹

¹School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Molecules (Basel, Switzerland)

|February 25, 2022

Summary

Quaternary ammonium salt polymers offer tunable properties for diverse applications. This review details their synthesis, structure-property relationships, and industrial uses, suggesting future research directions for advanced polymer development.

Keywords:

acrylamide propyl trimethyl ammonium chloride acryloyl oxygen ethyl trimethyl ammonium chloride cationicity diallyl dimethyl ammonium chloride intrinsic viscosity polymer quaternary ammonium salt

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Area of Science:

Polymer Chemistry
Materials Science
Chemical Engineering

Background:

Quaternary ammonium salt polymers are versatile polyelectrolytes with desirable characteristics like water-solubility and tunable cationicity.
Their unique properties make them valuable in numerous traditional and emerging industrial sectors.

Purpose of the Study:

To review the synthesis methods and properties of quaternary ammonium salt monomers and polymers.
To analyze the structure-property relationships of these polymers.
To highlight their applications and suggest future research directions.

Main Methods:

Review of synthesis strategies for quaternary ammonium salt monomers and polymers, focusing on achieving high molecular weight and narrow distribution.
Analysis of structure-property correlations, including molecular weight, charge density, and microstructural regulation.
Compilation of application examples across various industries.

Main Results:

Summarized progress in synthesizing high-performance quaternary ammonium salt polymers.
Established links between polymer structure (molecular weight, charge density) and functional properties.
Documented successful applications in water treatment, daily chemicals, petroleum, papermaking, and textiles.

Conclusions:

Quaternary ammonium salt polymers exhibit significant potential due to their adaptable characteristics.
Further research is recommended to develop high molecular weight polymers and deepen the understanding of structure-property relationships.
Targeted application development is crucial for maximizing their industrial impact.