Synthesis of Fluorenes and Dibenzo[g,p]chrysenes through an Oxidative Cascade

Modular Synthesis of a Semibuckminsterfullerene

A convergent synthesis of dibenzochrysenes and diindenochrysenes that proceeds from difluorofluorenes and acetoxyenone 15 has been used to prepare 5,6,11,12-tetrabromosemibuckminsterfullerene (31). The synthesis is highly modular and is distinguished by proceeding through an unsymmetrical intermediate. Our work will enable the straightforward preparation of semibuckminsterfullerenes from diindenochrysenes that lack bilateral symmetry using common reagents and nonpyrolytic conditions.

Fluorine on fluorenes

Fluorinated fluorenones can be elaborated to polyhalogenated dibenzochrysenes in 4 steps.