M. Ohkita et al., REACTION OF C-60 WITH CYCLOPENT-2-ENONE ACETALS - A CONVENIENT ACCESSTO CHIRAL C-60 DERIVATIVES, Journal of the Chemical Society, Chemical Communications, (17), 1995, pp. 1769-1770
C-60 reacts with cyclopent-2-enone ethylene acetal to give C-60-fused
norbornan-2-one acetal; modification of the starting acetal with a chi
ral auxiliary leads to a mixture of diastereoisomeric adducts from whi
ch a pair of enantiomerically pure C-60-fused norbornan-2-ones are rea
dily obtained.