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Related Concept Videos

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview01:20

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
Esters to Carboxylic Acids: Saponification01:25

Esters to Carboxylic Acids: Saponification

Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
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Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...

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Solvent-free process to esterify polysaccharides.

Atanu Biswas1, R L Shogren, J L Willett

  • 1Plant Polymer Research Unit, National Center for Agricultural Utilization Research, USDA/Agricultural Research Service, 1815 N. University Street, Peoria, Illinois 61604, USA. biswasa@ncaur.usda.gov

Biomacromolecules
|July 12, 2005
PubMed
Summary
This summary is machine-generated.

This study introduces a new, solvent-free method for creating polysaccharide acetates using iodine as a catalyst. This efficient process rapidly converts cellulose and starch into valuable acetate derivatives.

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Area of Science:

  • Polymer Chemistry
  • Organic Synthesis
  • Biomass Conversion

Background:

  • Polysaccharides like cellulose and starch are abundant biopolymers with diverse applications.
  • Traditional methods for polysaccharide acetylation often require harsh conditions, solvents, and multiple steps.
  • Developing efficient and environmentally friendly acetylation processes is crucial for sustainable chemistry.

Purpose of the Study:

  • To develop a novel, solvent-free catalytic process for the direct acetylation of polysaccharides.
  • To investigate the use of iodine as an effective catalyst for polysaccharide acetylation.
  • To demonstrate the applicability of the method to common polysaccharides such as cellulose and starch.

Main Methods:

  • Acetylation of polysaccharides using acetic anhydride.
  • Employing iodine as a catalyst in a solvent-free system.
  • Characterization of the resulting polysaccharide acetate derivatives.

Main Results:

  • A simple, rapid, and highly efficient acetylation process was established.
  • High conversion ratios were achieved for the acetylation of polysaccharides.
  • Successful conversion of cellulose and starch into their respective acetate derivatives was demonstrated.
  • The process eliminates the need for organic solvents, offering environmental benefits.

Conclusions:

  • The novel iodine-catalyzed, solvent-free method provides an efficient route for polysaccharide acetate preparation.
  • This approach offers a greener and more sustainable alternative to conventional acetylation techniques.
  • The demonstrated conversion of cellulose and starch highlights the broad applicability of this novel process.