1,5‐Anhydro‐2,3‐ O ‐isopropylidene‐ l ‐lyxofuranose [(1 S ,4 S ,5 S ,6 R )‐5,6‐ O ‐isopropylidene‐2,7‐dioxabicyclo[2.2.1]heptane‐5,6‐diol]

The tricyclic title compound, C 8 H 12 O 4 , was formed in the reduction by diisobutylaluminium hydride of a 5‐ O ‐trifluromethanesulfonyl lactone and is likely to be useful as a chiral intermediate for the synthesis of bioactive compounds. The absolute configuration was determined by the use of 2,3‐ O ‐isopropylidene‐ l ‐lyxono‐1,4‐lactone as the starting material.