There are 1,3,5-cycloheptatriene (2), bicyclo[ 4. 3. 0] nonatriene cation (16), bicyclopropene dication (17), (18), etc., their Both physical and chemical properties are shown as delocalized homoaromatic substances.
There are also 1,3,5-cycloheptatriene (2), bicyclo [4.3.0] nontriene cation (16), diisocyclic propylene dication (17), (18), etc. their physical and chemical properties show that they are delocalized Homoaromatic substances.<br>