67 天然有機化合物,特に多糖類の変形について
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Intimate, homogeneous modification of two polyhydroxylic polysaccharides derived from both of cotton (1) and dextran (2) was studied through reaction with a wide variety of organometallic reactants. Cotton (1), a water insoluble, cellulosic polysaccharide, was reacted with a variety of organotin halides in the presence of bis(ethylenediamine)copper(II) hydroxide using an interfacial condensation system. Dextran (2), a water soluble polysaccharide, was modified through condensation with both organotin and organotitanium halides employing sodium hydroxide and/or triethylamine as the added base. Analysis of both condensation products indicated the presence of tin or titanium in the crosslinked lattice structure of the polysaccharide. The product is a combination of a number of modified structure units linked to each other or to unmodified saccharide units. The modified polysaccharides had typically lower heats of combustion than unmodified polysaccharide. The products were also hydrophobic and resistant to hydrolysis providing them utility for usages as insulation materials and in rainware. Finally, the tin containing products exhibited inhibition characteristics against a number of common fungi giving them utility in applications where resistance to mildew, rot, and the like is required such as topical bandages. In addition, sucrose (3), which is a naturally occurring disaccharide, was successfully polymerized through reaction with a number of organotin dihalides employing the aqueous interfacial condensation technique to form crosslinked networks. The present organotin products also showed good activity toward some biological species. A detailed description is given of the structural characterization of the modified products utilizing infrared spectroscopy, thermal analysis, elemental analysis, solubility, and mass spectroscopy.
- 天然有機化合物討論会の論文
- 1983-09-15
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