Transition-metal complexes containing phosphorus ligands. Part II. Triaryl phosphite derivatives of ruthenium and osmium

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Abstract
Simple metathetical replacement reactions have been utilised to synthesise some triaryl phosphite complexes MX2[P(OR)3]4(M = Ru or Os; X = Cl, Br, or I) from the corresponding triphenylphosphine derivatives MX2(PPh3)x(x= 3 or 4). Carbonyl and nitrosyl derivatives MX2(CO)[P(OR)3]3, MX2(CO)2[P(OR)3]2, and MX3(NO)[P(OR)3]2 have also been prepared. The complexes RuHX(PPh3)3(X = Cl or Br) have been shown to undergo metathetical exchange to form triaryl phosphite complexes which react further, with elimination of a molecule of hydrogen, to yield organo-ruthenium(II) species. Structures containing a σ-bond between the central ruthenium atom and an ortho-carbon atom of one of the aryl rings are proposed for these latter derivatives and supporting spectroscopic evidence is discussed.