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.