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Chelating Phosphane–Boranes as Hemilabile Ligands – Synthesis of[Mn(CO)3(η2-H3B·dppm)][BArF4] and [Mn(CO)4(η1-H3B·dppm)][BArF4]

  1. Nicolas Merle,
  2. Christopher G. Frost,
  3. Gabriele Kociok-Köhn,
  4. Michael C. Willis,
  5. Andrew S. Weller

Article first published online: 10 AUG 2006

DOI: 10.1002/ejic.200600526

Issue

European Journal of Inorganic Chemistry

European Journal of Inorganic Chemistry

Volume 2006, Issue 20, pages 4068–4073, October 2006

Additional Information

How to Cite

Merle, N., Frost, C. G., Kociok-Köhn, G., Willis, M. C. and Weller, A. S. (2006), Chelating Phosphane–Boranes as Hemilabile Ligands – Synthesis of[Mn(CO)3(η2-H3B·dppm)][BArF4] and [Mn(CO)4(η1-H3B·dppm)][BArF4]. Eur. J. Inorg. Chem., 2006: 4068–4073. doi: 10.1002/ejic.200600526

Author Information

  1. Department of Chemistry, University of Bath, Bath, BA2 7AY, UK, Fax: +44-1225-386231

Publication History

  1. Issue published online: 5 OCT 2006
  2. Article first published online: 10 AUG 2006
  3. Manuscript Received: 6 JUN 2006

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Keywords:

  • Boranes;
  • Catalysis;
  • Hemilabile ligands;
  • Manganese;
  • Phosphanes

Abstract

Manganese complexes bearing the chelating phosphane–borane ligand H3B·dppm [dppm = bis(diphenylphosphanyl)methane] have been prepared. Addition of H3B·dppm to Mn(CO)5Br using Na[BArF4] as a halide-abstracting reagent affords [Mn(CO)3(η2-H3B·dppm)][BArF4] (1). This reacts with CO to open the bidentate borane to afford [Mn(CO)4(η1-H3B·dppm)][BArF4] (2) in which the borane is now bound in a monodentate manner. The CO addition is reversible, and placing 2 under vacuum (hours) regenerates 1 quantitatively, demonstrating that the chelating phosphane–boranes can act as hemilabile ligands. The complexes 1 and 2 have been fully characterised by NMR spectroscopy and X-ray crystallography. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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