Polysulfonylated cyclodextrins. Part 11. Preparation and structural validation of three isomeric pentakis(6-O-mesitylsulfonyl)cyclomaltoheptaoses

Three isomers of cyclomaltoheptaose derivatives, 1a-c, which possess five m esitylenesulfonyloxy groups on their C-6 atoms, were prepared. Assignment o f the regiosiomers was performed by their conversion into compounds contain ing five 3,6-anhydroglucose units followed by H-1 NMR analyses. The structu res of the pentakis(3,6-anhydro) derivatives were also confirmed by their d erivation from the known bis(TBDMS) derivatives.