High-Pressure Diels-Alder Reaction of Cyclooctatetraene with Dimethyl 1,4-Dimethyl-7-oxabicyclohepta-2,5-diene-2,3-dicarboxylate. Single Crystalline State Valence Isomerization of a syn-Tricyclo2,5>octane Derivative

Article abstract of DOI:10.1246/bcsj.68.2669

High-pressure Diels-Alder reaction of cyclooctatetraene with dimethyl 1,4-dimethyl-7-oxabicyclo<2.2.1>-hepta-2,5-diene-2,3-dicarboxylate afforded six products, one of which was shown to be a 2:2-adduct having a syn-tricyclo<4.2.0.0^2,5>octane framework.Upon radiation with X-rays, the tricyclooctane derivative isomerized to a cyclooctadiene derivative.