Chemistry Letters, Vol.49, No.5, 589-592, 2020
Catalytic Cycloisomerization of Conjugated Bisbutatrienes into Pentalene Skeletons: Synthesis and Properties of Bisbutatrienes with an Acenaphthene Backbone
Conjugated bisbutatrienes 1a-f with an acenaphthene backbone were synthesized and characterized. The conjugated cumulene moiety worked well as a starting point for the construction of polycyclic conjugated hydrocarbons. The cycloisomerization of 1 catalyzed by Ga(III) and In(III) salts directly gave the diareno[a,f]pentalene framework 6.