Diels–Alder approach to the synthesis of azulene-substituted benzene derivatives. Synthesis and redox behavior of 1, 2-di (6-azulenyl) tetraphenylbenzenes
1, 2-Di (6-azulenyl) tetraphenylbenzenes and (6-azulenyl) pentaphenylbenzenes were synthesized by Diels–Alder reaction of di (6-azulenyl) acetylenes and 6-(phenylethynyl) azulenes with tetraphenylcyclopentadienone. Mono (6-azulenyl) benzenes exhibited a reduction wave upon cyclic voltammetry (CV). In contrast to the benzene derivatives, di (6- azulenyl) benzenes showed a two-step reduction wave at similar potential region upon ...