T. Uyehara et al., ANIONIC [1,3]-SIGMATROPIC REARRANGEMENTS OF AN OXY-COPE SYSTEM INCORPORATED IN 8-METHYLENEBICYCLO[3.2.1]OCT-6-ENE AND RELATED FRAMEWORKS, Chemistry Letters, (5), 1996, pp. 389-390
Treatment of an hylene-endo-2-vinylbicyclo[3.2.1]oct-6-en-exo-2-ol wit
h KH in THF gave mainly a [5-6] fused-ring compound via [1,3] sigmatro
py with retention of the configuration in the migrating group.