Thermal rearrangement of bicyclo[4.2.0]octa-4,7-diene-2,3-dione: synthesis of bicyclo[3.2.1]octa-3,6-diene-2,8-dione
Abstract
Bicyclo[4.2.0]octa-4,7-diene-2,3-dione rearranges on heating at ca. 150 °C to bicyclo[3.2.1]octa-3,6-diene-2,8-dione which is in turn rapidly decarbonylated to tropone at 200 °C.