Ozonolysis of 3,6-anhydro-4-O-(p-toluenesulphonyl)-D-glucal (9), obtained i
n four steps from D-glucose, provided the target compound 11. The structure
and configurations of 9 and 11 have been determined by spectral studies an
d X-ray crystallography. Similar strategy with D-galactose provided the cor
responding derivatives 10 and 12, respectively.