Synthesis of Hyperbranched Aminopolysaccharides.

Sugar dihydroozaxole monomers with two free hydroxyl groups undergo acid-catalyzed polymerization to hyperbranched aminopolysaccharides [Eq. (a)]. Their molecular weights were determined by the light-scattering method to be between 2.3×105 and 7.6×105 . The degree of branching determined by 1 H NMR spectroscopy after reaction with [iPr2 Si(Cl)]2 O is close to the ideal value. Ts=MeC6 H4 SO2 , CSA=10-camphorsulfonic acid. © 1998 WILEY-VCH Verlag GmbH, Weinheim, Fed. Rep. of Germany.