Zöphel L, Berger R, Gao P, Enkelmann V, Baumgarten M, Wagner M, Müllen K.
Chemistry. 2013 Dec 23;19(52):17821-6.Based on modern pyrene chemistry, a new route toward the synthesis of the peri-pentacene framework was developed. Firstly, the tetraketo form as stable precursor was targeted, because the fully aromatic peri-pentacene is predicted to suffer from high instability and reactivity. Therefore, a recently developed 4,5,9,10-tetrafunctionalization of pyrene was utilized to build up a planar and a dragonfly-shaped derivative in five steps, which only differ in the two outer bonds between the peripheral benzene rings. Read More