Conclusions
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1.
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 0R =0.00).
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2.
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 0R =−0.15).
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Literature cited
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2570–2572, November, 1971.
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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
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DOI: https://doi.org/10.1007/BF00854330