Solvent-dependent interconversions between Rhi, RhII, and RhIII complexes of an aryl-monophosphine ligand

Michael Montage, Gregory Leitus, Linda J.W. Shimon, Yehoshoa Ben-David, David Milstein

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Reaction of the aryl-monophosphine ligand α2- (diisopropylphosphino)isodurene (1) with the RhI precursor [Rh(coe)2(acetone)2]BF4 (coe = cyclooctene) in different solvents yielded complexes of all three common oxidation states of rhodium, depending on the solvent used. When the reaction was carried out in methanol a cyclometalated, solvent-stabilized RhIIIalkylhydride complex (2) was obtained. However, when the reaction was carried out in acetone or dichloromethane a dinuclear η6-arene RhII complex (5) was obtained in the absence of addedredox reagents. Moreover, when acetonitrile was added to a solution of either the RhII or Rh III complexes, a new solvent-stabilized, noncyclometalated Rh I complex (6) was obtained. In this report we describe the different complexes, which were fully characterized, and probe the processes behind the remarkable solvent effect observed.

Original languageEnglish
Pages (from-to)9043-9055
Number of pages13
JournalChemistry - A European Journal
Issue number32
Publication statusPublished - Nov 19 2007


  • Arene complexes
  • C-H activation
  • Oxidation state
  • Phosphanes
  • Rhodium
  • Solvent effects

ASJC Scopus subject areas

  • Catalysis
  • Organic Chemistry

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