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2,3,4-Tricarba-nido-hexaboranes(7) with a Bridging B-Ethyl-B Moiety
European Journal of Inorganic Chemistry (1998)
  • Bernd Wrackmeyer
  • Hans-Joerg Schanz, Georgia Southern University
  • Matthias Hofman, University of Georgia
  • P. V. R. Schleyer

Hydroboration of diethyl(1-propynyl)borane 1 with tetraethyldiborane(6) in the presence of a catalytic amount of trimethyl- or tributyltin chloride gave two new organo-substituted carboranes 6 and 7 with 2,3,5-tricarba-nido-hexaborane(7) and 2,3,4-tricarba-nido-hexaborane(7) skeletons, respectively, along with polymeric material and the known organo-substituted 1-carba-arachno-pentaborane(10) (3) and pentaethyl-1,5-dicarba-closo-pentaborane(5) (4). Selective 11B(5,6) decoupled 13C-NMR spectra indicate an unprecedented B(5)−ethyl−B(6) bridge in 7. This structure is supported by the agreement between experimental and calculated 11B- and13C-chemical shifts on a model compound 7d with methyl groups in the 1,2,3,5,6-positions and an ethyl group bridging B(5) and B(6).

  • Ab initio calculations,
  • Boron,
  • Carboranes,
  • NMR spectroscopy
Publication Date
Citation Information
Bernd Wrackmeyer, Hans-Joerg Schanz, Matthias Hofman and P. V. R. Schleyer. "2,3,4-Tricarba-nido-hexaboranes(7) with a Bridging B-Ethyl-B Moiety" European Journal of Inorganic Chemistry (1998)
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