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Study on Preparation of Polysaccharides Derivatives

Author: LiuZhanYong
Tutor: LiuWenBin
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: carbamate isocyanate chiral separation cellulose derivatives
CLC: O623.624
Type: Master's thesis
Year: 2009
Downloads: 29
Quote: 0
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Abstract


Many derivatives of polysaccharides such as cellulose, amylose, chitosan have been examined as chiral stationary phases (CSPs) for enantioseparation by HPLC. Among them, cellulose derivatives, especially phenylcarbamate derivatives, have been most extensively studied and many empirical correlations have been establish-ed between the physical or chemical properties and enantiomer recognition abilities of CSPs. The performance qualities of CSPs in terms of recognition and selective chiral retention are at the heart of these separation techniques. So, this field remains one of the most exciting in the separation sciences.The main works of the thesis are as follows:The development of the chiral stationary and the application of the cellulose derivatives as chiral stationary phases in high-performance liquid chromatography were reviewed. The separation mechanism based on the chiral stationary phase was discussed.Synthesis of isocyanates with triphosgene.9H-fluoren-2-yl isocyanate, 4-bromophenyl isocyanate,4-chlorphenylisocyanate etc, were prepared from triphosgene and corresponding amines under a nitrogen atmosphere, the synthetic conditions such as reagent formula, reaction temperature and reaction time were optimized. Their structures were confirmed by FT-IR (KBr background) and NMR.Cellulose and amylose derivatives which could be used as CSPs were synthe-sized from cellulose (amylose) and corresponding isocyanates based on the literatures. The chemical structures of the obtained products were characterized

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CLC: > Mathematical sciences and chemical > Chemistry > Organic Chemistry > Aliphatic compounds ( acyclic compounds) > Aliphatic carboxylic acid and its derivatives > Carboxylic acid derivatives of the function > Ester
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