High Temperature Synthesis of Bowl-Shaped Subunits of Fullerenes. II1. From 9,9′-Bi-9H-fluorenylidene to Diindeno[l,2,3,4-defg; 1′,2′,3′,4′-mnop]chrysene

摘要: Abstract Thermal dehydrocyclization as well isomerization reactions of 9,9′-bi-9H-fluorenylidene (2) have been investigated at temperatures above 700°C in the gas phase resulting benz[e]indeno(l,2,3-hi)acephenanthrylene(3) and dibenzo[g,p]chrysene(4), respectively. If 4 is catalytically converted, benz[g]indeno[l,2,3,4-mnop]chrysene (5) formed resonable yields by dehydrocyclization. Separate pyrolysis runs 3 5 900°C give finally diindeno[l,2,3,4-defg;1′,2′,3′,4′-mnop]chrysene (1), a bowl-shaped subunit buckminsterfullerenes, besides other polycyclic aromatic hydrocarbons.