High temperature synthesis to bowl-shaped subunits of fullerenes - IV. From 4-[9H-fluorenylidene-(9)]-4H-cyclopenta[def]phenanthrene to fluoreno[1,9,8-abcd]corannulene and difluoreno[1,9,8,7-cdefg;2′,1′,9′,8′-klmno]anthracene
Fluoreno[1,9,8-abcd]corannulene (4) and difluoreno[1,9,8,7-cdefg;2',1',9',8'-klmno]-anthracene (8) have been synthesized by multistage thermal and catalytic dehydrocyclization reactions starting from 4-[9H-fluorenylidene-(9)]-4H-cyclopenta[def]phenanthrene and benzo[p]naphtho-[1,8,7-ghi]chrysene, respectively.
Lai, Yee-Hing; Ang, Slau-Gek; Li, Hwee-Chze, Journal of the Chemical Society. Perkin transactions II, 1992, # 8, p. 1315 - 1319