Branched hydrocarbon propellers (9 and 12) were prepared by stepwise palladium-catalyzed Hagihara−Sonogashira coupling reactions and Diels−Alder cycloadditions and submitted to oxidative cyclodehydrogenation by FeCl3 to afford two new giant graphite disks 2 and 3 with 3-fold symmetry in high yield. One of the precursors, the polyphenylene dendrimer 9 containing 150 carbon atoms, was crystallographically