Preferential precipitation of C70 over C60 with p-halohomooxacalix[3]arenes
Literature Information
Naoki Komatsu
Preferential precipitation of C70 from a toluene solution of C60 and C70 was accomplished with p-trihalohomooxacalix[3]arenes (13·X·X·X) prepared by the reductive coupling of diformylphenols. Heavy halogens, Br and/or I, are essential at the para position of 13·X·X·X for obtaining good yields and selectivities. C70 with up to 92% purity was obtained after the preferential precipitation.
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