M. Sawamura et al., Stepwise synthesis of fullerene cyclopentadienide R5C60- and indenide R3C60-. An approach to fully unsymmetrically substituted derivatives, ORG LETT, 2(13), 2000, pp. 1919-1921
Fullerene cyclopentadienide (PhCH2)(2)Ph3C60- and indenide (PhCH2)(2)PhC60-
, each bearing two different organic groups, were efficiently synthesized t
hrough regioselective reactions of 1,4-(PhCH2)(2)C-60 with an organocopper
reagent (PhMgBr/CuBr . SMe2) or a Grignard reagent (PhMgBr) followed by dep
rotonation with (KOBu)-Bu-t.