Cp*rhodium and iridium complexes with bisoxazolines: synthesis, fluxionality and applications as asymmetric catalysts for Diels-Alder reactions
作者： David L Davies , John Fawcett , Shaun A Garratt , David R Russell
DOI: 10.1016/S0022-328X(02)01859-4
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摘要: Abstract Reaction of the dimers [MCl2Cp*]2 (M=Rh, Ir) with bis-oxazolines [NN=bis(2-oxazoline) (box), 2,2-bis(2-oxazolinyl)propane (bop), 1,2-bis(2-oxazolinyl)benzene (benbox)] in presence NaSbF6 (or KPF6) gives complexes [MCl(NN)Cp*][EF6] (E=P or Sb) which have been fully characterised. Treatment some these AgSbF6 generates dications [Rh(OH2)(NN)Cp*]2+, are fluxional at room temperature. One is an enantioselective catalyst for Diels–Alder reaction methacrolein and cyclopentadiene. Three complexes, [RhCl(iPr-box)Cp*][SbF6], [RhCl(iPr-bop)Cp*][SbF6] [RhCl(Et-benbox)Cp*][SbF6] characterised by X-ray crystallography.
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