Fluoreno fluorene

Another class of compounds that can be included here are fluorene derivatives. For example, fluoreno[l,9- /e]-l,2-azasilines such as (63) are synthesized from the reaction of imines with silenes <930M3666> whilst oxasilin analogues such as (64) are formed from the reaction of silenes with fluorenone <870M1246>. 

Figure 2.15 Closed-shell fluoreno[4,3-c]fluorene prepared by the Haley group.

Oligomeric orr/70-arylenethynylenes with unsubstituted triple bonds give a cascade of radical reactions induced by the Bu3SnH/AIBN system. The cascade includes three consecutive ring closures with the formation of substituted benzoMindeno[2,l-c]fluorene or benzo[l,2]fluoreno[4,3-fcjsilole derivatives [318]. The cascade is initiated by radical addition to one of the triple bonds. 

Correct 8aH-Fluoreno[ l,2-b]oxirene C.A. l,2-Epoxy-8aH-fluorene R. I. 8aH-Oxireno[ i]fluorene... 

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