Intramolecular frustrated lewis pair with the smallest boryl site: Reversible H2 addition and kinetic analysis

Konstantin Chernichenko, Bianka Kátai, I. Pápai, Vladimir Zhivonitko, Martin Nieger, Markku Leskelä, Timo Repo

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Ansa-aminoborane 1 (ortho-TMP-C6H4-BH2 ; TMP = 2,2,6,6-tetramethylpiperid-1-yl), a frustrated Lewis pair with the smallest possible Lewis acidic boryl site (-BH2), is prepared. Although it is present in quenched forms in solution, and BH2 represents an acidic site with reduced hydride affinity, 1 reacts with H2 under mild conditions producing ansa-ammonium trihydroborate 2. The thermodynamic and kinetic features as well as the mechanism of this reaction are studied by variable-temperature NMR spectroscopy, spin-saturation transfer experiments, and DFT calculations, which provide comprehensive insight into the nature of 1.

Original languageEnglish
Pages (from-to)1749-1753
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number6
Publication statusPublished - Feb 9 2015



  • Aminoboranes
  • Density functional calculations
  • Frustrated lewis pairs
  • Kinetics
  • Thermodynamics

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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