A strong Cotton effect associated with the ring oxygen was studied in aromatic glycofuranosides. Phenyl and phenyl 1-thioglycofuranosides gave a strong band at 180nm and 200-210nm respectively, similar to the corresponding glycopyranosides, suggesting that the ring oxygen helicity rule can be extended to these aromatic glycofuranosides or the band can be used to determine their anomeric configurations and conformations.
