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Fourteen isomers of bis(formylmethano)C 60 were isolated and characterized. A mixture of the bisadducts was obtained by the reaction of C 60 with an α-formylsulfonium ylide, and then separated into 15 fractions by preparative HPLC, preparative TLC, and recycling preparative HPLC. Fourteen of the fifteen fractions were found to consist of a single isomer, respectively, which were assigned...
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