Aldehydes, introduction polysaccharides

Aldehydes, introduction in polysaccharides, 189-190 Aligned fiber moderators, flow rate, 346r Amine functions, effect on pH sensitivity of poly(ortho esters), 176-178 Aminobenzoate esters, correlations of partition coefficients for solvent pairs, 62,63/... 

The discussion of this somewhat heterogeneous collection of free and substituted dicarbonyl carbohydrates will be divided into (a) dialdehyde compounds, (b) keto-aldehyde compoimds having free or substituted carbonyl groups, and (c) the diketo compounds. Each Section (except the last one, containing only a few members) will be divided into (a) an introduction consisting of a general discussion concerning formation and preparation, (b) a description of individual compounds, and (c) a discussion of properties and reactions. A short discussion on oxidized polysaccharides is included before the Tables of dicarbonyl carbohydrates and their derivatives. 

This type of functionalization is common in polysaccharide chemistry but it also has applications in other fields. It has been employed for the introduction of self-fluorescence of nanocomposites as well as for the transformation of aldehyde end-capped polymers into amine end-capped ones. ... 

Scheme 1.17 Introduction of aldehyde functionalities using vicinal hydrojg l groups of polysaccharides.

In order to couple PEG to another molecule such as polypeptide, polysaccharide, polynucleotide, or small organic molecule, activation of one or both termini is necessary. The activation of PEG involves introduction of various functional groups such as activated carbonates, acdr ted esters, aldehydes, or alkyl 2,2,2,-trifluoroethanesulfonates (tresylates), depending on the type of the reactive group on the molecule that will be coupled. A variety of chemical modifications are used to obtain an activated functional PEG derivative. ... 

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