THERMAL REVERSIBILITY OF THE PHOTO-CHEMICAL DI-PI-METHANE REARRANGEMENT OF BICYCLO[2,2,2]OCTADIENONES - CONFIRMATION OF REGIOSPECIFICITY AND STEROCHEMISTRY BY X-RAY STRUCTURE ANALYSES

Thermolysis of the tricyclic photo-isomer obtained by di-π-methane rearrangement of a t-butyl- substituted bicyclo[2, 2, 2]octadienone regenerates a new bicyclo[2, 2, 2]octadienone in which the oxo- substituted C2-bridge has undergone a 1, 3-migration. The structures of the three isomers involved were established by X-ray analyses. © 1979, CSIRO. All rights reserved.