Light Scattering in Non-aqueous Solutions of Low-Molecular-Mass Compounds: Application for Supramer Analysis of Reaction Solutions

The use of static and dynamic light scattering (SLS and DLS, respectively) for chraracterization of solutions (0.005–0.20 mol·L− 1) of a series of carbohydrate-based low-molecular-mass compounds (glycosyl donors for chemical glycosylation) in anhydrous acetonitrile is described. The DLS data obtained suggest that, in the cases studied, the solute molecules form different supramolecular assemblies (supramers) with variable hydrodynamic radii. Analysis of concentration dependences of complementary SLS data for these solutions revealed that solvent quality may change dramatically with concentration and with the nature of solute. These results suggest that a combination of SLS and DLS is a valuable analytical tool for the supramer analysis of reaction solutions, which is useful for the rational selection of optimal concentrations for performing glycosylation reactions.