(5S)-3-Oxo-4-oxa-endo-tricyclo-[5.2.1.0(2,6)]dec-8-en-5-yl acetate

The molecular structure of C11H12O4, based on a norbornene core, was establ ished to confirm the configuration of an acetoxy side-chain group in additi on to the formation of the endo product. The acetoxy side chain lies in an axial position relative to the five-membered fused ring. Bond distances and angles show no unusual features, with all geometric parameters lying withi n their expected ranges. The overall stereochemistry of the molecule was as certained from the chiral furanone starting material.