Abstract
AbstractEne–diyne systems possessing 1‐ and 2‐azulenyl groups at the periphery were prepared by palladium‐catalyzed cross‐coupling reaction of 1‐ and 2‐ethynylazulenes with 9‐dibromomethylene‐9H‐fluorene and 9,10‐bis(dibromomethylene)‐9,10‐dihydroanthracene or 2‐iodoazulene with 9,10‐bis(diethynylmethylene)‐9,10‐dihydroanthracene under Sonogashira–Hagihara conditions. The redox behavior of the ene–diyne compounds was examined by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Moreover, a significant color change of the ene–diyne derivatives was observed with visible spectroscopy under electrochemical reduction conditions.
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