[6,6]-Phenyl C71 butyric acid derivatives (C71-PCBR3) having a selectivity of greater than 95 wt% of the α-isomer are provided by reacting fullerene C70 with a dialkyl sulfonium tetrafluoroborate having the formula:
[6,6]-Phenyl C71 butyric acid derivatives (C70-PCBR3) having a selectivity of greater than 95 wt % of the α-isomer are provided by reacting fullerene C70 with a dialkyl sulfonium tetrafluoroborate having the formula:
[6,6]-Phenyl C71 butyric acid derivatives (C70-PCBR3) having a selectivity of greater than 95 wt % of the α-isomer are provided by reacting fullerene C70 with a dialkyl sulfonium tetrafluoroborate having the formula: