Fullerene pentaarylated

There are limited number of reports of the observation and isolation of functionalized fullerene cations. The monoalkylated [RC6o+(73,74), C12CH-C70+ (75), and (EtO)2P+(OH)CH2-C60+ (76)], monoprotonated [HC60+ (7-2,77)], and pentaarylated [Ar5C60+ (75)] fullerene cations have thus far been prepared as stable solutions or isolated as solids (Figure 1). 

A comparable addition pattern with as many as five attached groups allowing further functionalization is represented in pentaaryl-fullerenes like 25-27 (Troshina et al., 2007 Zhong et al., 2006). Whereas the free acids are virtually insoluble in pure water, the use of basic water in the case of 25 (Zhong et al., 2006) and conversion of the polyacids 26 and 27 to the corresponding potassium salts leads to stable aqueous solutions with high fullerene concentrations. 

Birkett and co-workers506 have applied a different approach using chloride abstraction with A1C13 from Ar5C6oCl to generate pentaarylated fullerene cations... 

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