CARBOHYDRATE MODIFIED POLYSILOXANES .2. SYNTHESIS VIA HYDROSILATION OF MONOSACCHARIDE AND DISACCHARIDE AND OLIGOSACCHARIDE ALLYLGLYCOSIDES

The synthesis of linear carbohydrate modified polysiloxanes has been s uccessfully performed by hydrosilation of functionalized and protected carbohydrate derivates. The functionalization (allyl glycosilation) m ay be applied to a wide variety of reducing carbohydrates. In this stu dy, mono-, di- and oligosaccharides were converted by a simple two-ste p reaction (beta-acetylation and allyl glycosilation) into active comp ounds, allowing the polymer analogous addition to random poly[dimethyl -co-hydromethyl]siloxanes (hydrosilation). By variation of the Si-H am ount in the starting polymers, polysiloxanes with 1.5% to 56% (by weig ht) carbohydrate content were prepared. At small degrees of substituti on the modified polysiloxanes remain soluble in non-polar media. With increasing carbohydrate content the polymers become more and more solu ble in polar solvents like isopropanol or methanol. A polysiloxane wit h 29% maltose modified comonomeric units (56 wt.-% carbohydrate conten t) was fully water soluble.