Sr. Wilson et al., RESOLUTION OF ENANTIOMERS OF CIS-FUSED AND TRANS-FUSED C-60-ENONE [2+2] PHOTOADDUCTS, Journal of organic chemistry, 58(24), 1993, pp. 6548-6549
Enantiomers of the mixture of cis and trans photocycloadducts of C60 a
nd 3-methylcyclohexenone were separated by HPLC on the chiral stationa
ry phase (S,S)-Whelk-O; chiroptical properties indicate that the fulle
rene moiety in the strained trans cycloadducts has a skewed pi-system
with local C2 symmetry.