 On heating the compound rearranges to a bicyclic [6,4,0] isomer.Reducing the compound at low temperatures allowed analysis of the dianion by proton NMR with the inner protons resonating at - 4.5 ppm relative to TMS, evidence of an aromatic diamagnetic ring current.In one study the 1,7-ditrans isomer is generated at low temperatures in THF by dehydrohalogenation of a hexabromocyclododecane with potassium "tert"-butoxide.