Compound 1 was prepared by taking advantage of the versatile regioselective reaction developed in the group of Diederich 8 which led to C 60 bis-adducts by a cyclization reaction at the C sphere with bis-malonates in a double Bingel 9 cyclopropanation. To this end, bis-malonate was prepared by the reaction of diol 2 with malonic acid mono-ester 3 under esterification conditions using N,N′-dicyclohexylcarbodiimide (DCC) and 4-dimethylamino pyridine (DMAP) in CH 2 Cl ...
