(2-exo,7-exo,9-endo,10-endo)-11-Oxatri­cyclo­[6.2.1.0^2,7]­undec-4-ene-9,10-diyl di­acetate

The title compound, C₁₄H₁₈O₅, shows a non-planar geometry.

The 2-exo,7-exo,9-exo,10-exo isomer of 11-oxatricyclo­[6.2.1.0^2,7]undec-4-ene-9,10-di­yl diacetate

The title compound, (2-exo,7-exo,9-exo,10-exo)-11-oxa­tri­cyclo­[6.2.1.0^2,7]undec-4-ene-9,10-di­yl diacetate, C₁₄H₁₈O₅, was synthesized in the same way as its 9-endo,10-endo isomer. The X-ray study showed that the Diels–Alder reaction of 5-exo,6-exo-diacetato-7-oxabicylclo[2.2.1]hepta-2-ene with 3-sulfolene, a protected 1,3-butadiene, yields the 2-exo,7-exo product, i.e. reacts in the same way as the 5-endo,6-endo isomer of the starting compound. Inter­molecular C—H...O inter­actions link the mol­ecules into infinite chains extending along the b axis of the monoclinic crystal structure.