Nonalternant isomer of pentacene fusing two azulene units

Heptacyclic aromatic hydrocarbon isomers with two azulene units fused

“…Compound S1 was synthesized via Friedel-Cras acylation between 2-bromoazulene and octanoyl chloride, resulting in a yield of 57%. This was followed by a reduction using borane and boron triuoride, providing compound S2 48 with a moderate yield of 59%. Subsequently, the key intermediate M1 was prepared through a conventional Pd-catalyzed reaction between S2 and bis(pinacolato)diboron, achieving a yield of 78%.…”