Journal
ORGANIC & BIOMOLECULAR CHEMISTRY
Volume 1, Issue 1, Pages 204-209Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b208107e
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Preferential precipitation of C-70 from a toluene solution of C-60 and C-70 was accomplished with p-trihalohomooxacalix[3]arenes (1(3).X.X.X) prepared by the reductive coupling of diformylphenols. Heavy halogens, Br and/or I, are essential at the para position of 1(3).X.X.X for obtaining good yields and selectivities. C-70 with up to 92% purity was obtained after the preferential precipitation.
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