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Leaving Groups

Leaving Groups

The nature of leaving groups strongly influences the outcome of a nucleophilic substitution reaction.
In general, in a nucleophilic substitution reaction, a nucleophile displaces a functional group, called the leaving group, from the substrate to give a substituted product. A leaving group departs the substrate molecule through heterolytic cleavage, taking the pair of electrons with it to become a relatively stable weak base in the form of an anion or a neutral molecule.
In a...

Introduction to Functional Groups

Introduction to Functional Groups

Functional groups are group of atoms with specific chemical properties that occur within organic molecules and sometimes denoted as “R”. Functional groups are found along the carbon backbone of macromolecules can form chains or rings of carbon atoms. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of common functional groups
The table below summarizes some of the major functional...

Overview of Advanced Functional Groups

Overview of Advanced Functional Groups

Functional groups are groups of atoms with specific chemical properties that occur within organic molecules and are sometimes denoted as “R”. Functional groups can “functionalize” a compound by enabling it to adopt different physical and chemical properties.
Types of Advanced Functional Groups
The table below summarizes some of the major functional groups in organic chemistry.

Protection of Alcohols

Protection of Alcohols

This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

Nucleophilic Aromatic Substitution: Addition–Elimination (S_NAr)

Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...

Nucleophilic Acyl Substitution of Carboxylic Acid Derivatives

Nucleophilic Acyl Substitution of Carboxylic Acid Derivatives

Nucleophilic acyl substitution is an important class of substitution reactions involving a nucleophile and an acyl compound, such as carboxylic acids and their derivatives. In these reactions, the leaving group attached to the acyl group is substituted by a nucleophile. The general mechanism proceeds via two steps.

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Related Experiment Video

Updated: Jul 5, 2025

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

Published on: June 17, 2014

Cellulose Functionalization Using N-Heterocyclic-Based Leaving Group Chemistry.

Arvind Negi¹, Ali R Tehrani-Bagha¹

¹Department of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, 02150 Espoo, Finland.

|January 11, 2024

Summary

This summary is machine-generated.

Novel trisubstituted triazinium salts effectively preactivate cellulose for enhanced functionalization. This breakthrough enables diverse chemical modifications of cellulosic materials, opening new application avenues.

Keywords:

activators cellulose chemistry cellulose functionalization coloration leaving group chemistry surface modification

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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

Published on: January 7, 2019

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Towards Biomimicking Wood: Fabricated Free-standing Films of Nanocellulose, Lignin, and a Synthetic Polycation

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Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

Published on: January 7, 2019

Area of Science:

Materials Science
Organic Chemistry
Polymer Chemistry

Background:

Cellulose functionalization is crucial for developing advanced materials.
Existing methods often require harsh conditions or lack versatility.
Novel activators are needed to improve cellulose modification efficiency and scope.

Purpose of the Study:

To develop and optimize novel trisubstituted triazinium salts as cellulose preactivators.
To demonstrate the versatility of these preactivators for functionalizing cellulose with various chemical moieties.
To establish efficient single- and two-step functionalization strategies for cellulose.

Main Methods:

Synthesis and structural confirmation (NMR spectroscopy) of trisubstituted triazinium salts.
Preactivation of cellulose, confirmed by zeta potential measurements.
Functionalization of preactivated cellulose with diverse compounds (hydrocarbons, amino acids, colorants, biopolymers).
Analysis of functionalized cellulose using FTIR, time-gated Raman, and reflection spectroscopy.

Main Results:

Optimized synthesis of novel triazinium salt preactivators with N-heterocyclic leaving groups.
Successful preactivation of cellulose, indicated by a shift in surface zeta potential from negative to positive.
Demonstrated broad scope of functionalization, including attachment of hydrocarbons, cysteine, anthraquinone dyes, and zein protein.
Validated functionalization success using spectroscopic techniques (FTIR, Raman, reflection spectroscopy).
Developed efficient one-step and two-step functionalization protocols.

Conclusions:

Trisubstituted triazinium salts are effective cellulose preactivators, enabling versatile functionalization.
The developed methods offer efficient pathways for chemically linking diverse molecules to cellulose.
These approaches hold significant potential for creating tailored cellulosic materials for various applications.