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      1,2-Bis{(pentafluorophenyl)phenylphosphino}ethane: A Probe for Configurational Stability in Three-Legged Piano Stool Complexes

      Nieuwenhuyzen, Mark; Saunders, Graham C.; Smyth, E.C.M. Sarah
      DOI
       10.1021/om050893+
      Link
       pubs.acs.org
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      Citation
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      Nieuwenhuyzen, M., Saunders, G.C. & Smyth, E.C.M.S. (2006). 1,2-Bis{(pentafluorophenyl)phenylphosphino}ethane: A Probe for Configurational Stability in Three-Legged Piano Stool Complexes. Organometallics, 25(4), 996-1003.
      Permanent Research Commons link: https://hdl.handle.net/10289/2073
      Abstract
      The pentafluorophenyl-substituted diphosphine (C₆F₅)PhPCH₂CH₂PPh(C₆F₅) has been prepared, as a 1:1.7 mixture of rac (1a) and meso (1b) isomers, in four steps from dppe. The reaction between [Cp*RhCl(μ-Cl)]2 and 1 in the presence of tetrafluoroborate yielded a mixture of racemic diastereoisomers of [Cp*RhCl(κP,κP-1a)][BF₄] (4a•BF₄) and trans and cis isomers of [Cp*RhCl(κP,κP-1b)][BF₄] (4b•BF₄ and 4c•BF₄, respectively). On addition of Proton Sponge, 4a and 4c, in which at least one pentafluorophenyl group is close to the pentamethylcyclopentadienyl ligand, underwent rapid dehydrofluorinative carbon−carbon coupling giving trans- and cis-[{η⁵,κP,κP-C₅Me₄CH₂C₆F₄-2-PPhCH₂CH₂PPh(C₆F₅)}RhCl]⁺ (5 and 6), respectively. The latter underwent further dehydrofluorinative carbon−carbon coupling to give two isomers of [{η⁵,κP,κP-C₅Me₃[CH₂C₆F₄-2-PPhCH₂]₂}RhCl]+ (7). Isomerization of 4b to 4c was observed in chloroform and dimethlysulfoxide. Neither isomerization of 4a to 4b or 4c nor isomerization of 5 to 6 was observed at ambient or elevated temperature in dimethyl sulfoxide. The results provide the first evidence that complexes of η⁵,κP,κL-cyclopentadienyl-phosphine-donor ligands are configurationally stable at high temperature.
      Date
      2006
      Type
      Journal Article
      Publisher
      American Chemical Society
      Collections
      • Science and Engineering Papers [3124]
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