Tetraacetate of ezo-Oxabicyclo[2.2.1!hept-5-ene-2,3-diol (8).-Oxabicy clo[2.2.1]-hept-5-ene-2,3-dioI carbonate (lb) (600 mg, 3.8 mmol) was dissolved in 15 ml of the ethyl acetate and 0.77 ml of dry pyridine; 1 g of osmium tetroxide dissolved in 2 ml of ethyl acetate was added. This mixture was sealed and left for 24 hr at room temperature. The solution was filtered, and a dry, black precipitate weighing 1.4 g was collected; 60 g of sodium sulfite (Na3S03), previously dissolved in 300 ml of water, and 300 ml of ethyl alcohol were added to the black precipitate. The mixture was boiled for 7 hr, producing a new, black precipitate, Nad0S(S03)3] • 20. This solution was concentrated, and its volume was reduced to 50 ml. Sodium hydroxide solution (5 ml), 5% (w/v) was added. This mixture was maintained at room temperature for 1 hr. Once again it was neutralized with acid, then concentrated to dryness, and dried at 60-80°for 4 hr.Acetylation of the Anhydro as-Inositol 8.-Acetic anhydride (50 ml) was added to the dry residue previously obtained. This mixture was warmed for 24 hr in an electric bath. Then the aceetic anhydride was removed in vacuo, and the residue resembled needles, mp 188-190°, yield 40 mg (6.6%), ir max 1750, 1250, 840, 820 cm-1.ept-Inositol (9,11).-A solution (5 ml) consisting of 80% (v/v) acetic acid, 20% (v/v) water, and 1% (v/v) sulfuric acid was added to 10 mg (0.061 mmol) of hydroxylated material 8. The mixture was warmed over a water bath for 14 hr, then tested by paper chromatography.19 20 One spot was revealed which corresponded to cpi-inositol, R¡ 0.20.® Also the Scherer reaction18 was positive. The dry residue was acetylated by adding 5 ml of acetic anhydride and a few drops of concentrated sulfuric acid. This mixture was left at 40°for 24 hr and poured into cold water, and then yielded crystals of 11. Further purification from toluene yielded crystals, mp 186-190°.7
