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- W2026163043 abstract "Abstract The coordination of tert-butylfulleride ion (t-BuC60−) with tropylium (1a+), 1,4-di-tert-butyltropylium (1b+), and 1,4-dicyclopropyltropylium (1c+) ions yielded 1-tert-butyl-4-(3,6-R2-2,4,6-cycloheptatrien-1-yl)-1,4-dihydrofullerenes (2a: R = H, 2b: R = t-Bu, 2c: R = cyc-Pr) in isomerically pure form. The structures of 2a–c were determined from the 1H NMR NOE experiments. Spectrophotometric studies showed that 2a–c are unique hydrocarbons that regenerate t-BuC60− and 1+ in polar solvents by heterolysis of a carbon-carbon σ bond. Although this facile heterolysis is due principally to the high thermodynamic stabilities of both t-BuC60− and 1a–c+, the free energies of heterolysis are considerably lower than predicted from pKHA of t-BuC60− and pKR+ of 1a–c+ using Arnett's master equation. The results suggest that steric repulsion between the 1-tert-butyl group and the cycloheptatrienyl group on the surface of C60 plays an important role in enhancing the heterolysis of 2a–c. © 1997 Elsevier Science Ltd." @default.
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- W2026163043 date "2010-08-03" @default.
- W2026163043 modified "2023-10-06" @default.
- W2026163043 title "ChemInform Abstract: Ionically Dissociative Hydrocarbons Containing the C60 Skeleton." @default.
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- W2026163043 doi "https://doi.org/10.1002/chin.199744104" @default.
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