Using the Taft method it was shown that the 1-[1,8-dicarbaclosoundecaborane (11)] group is an electron-acceptor grouping, which exhibits only an induction effect (induction constantσ i=0.12; resonance constantσ R 0 =0.00).
The opening of the carborane structure to the anion of m-dicarbaundecaborane is postulated when the adduct of 1,8-dicarbaclosoundecaborane (11) with triphenylphosphine is formed, in which connection this grouping exhibits electron-donor properties (σ i=−0.24;σ R 0 =−0.15).
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Zakharkin, L.I., Kalinin, V.N., Rys, E.G. et al. Electronic effect of the 1-[1,8-dicarbaclosoundeaborane (11)] group 1-(1,8-B9C2H10). Russ Chem Bull 20, 2436–2438 (1971). https://doi.org/10.1007/BF00854330
- Induction Effect
- Electronic Effect
- Carborane Structure