31267-49-9Relevant academic research and scientific papers
Mononuclear ruthenium complexes containing two different phosphines in trans position: II. Catalytic hydrogenation of C{double bond, long}C and C{double bond, long}O bonds
Salvi, Luca,Salvini, Antonella,Micoli, Francesca,Bianchini, Claudio,Oberhauser, Werner
, p. 1442 - 1450 (2007/10/03)
Bis(acetate) ruthenium(II) complexes of the general formula Ru(CO)2(OAc)2(PnBu3) [P(p-XC6H4)3] (OAc = acetate, X = CH3O, CH3, H, F or Cl), containing different phosphine ligands trans to PnBu3, have been employed as catalyst precursors for the hydrogenation of 1-hexene, acetophenone, 2-butanone and benzylideneacetone. For comparative purposes, analogous reactions have been performed using the homodiphosphine precursors Ru(CO)2(OAc)2(PnBu3)2 and Ru(CO)2(OAc)2(PPh3)2. The catalytic activity of the heterodiphosphine complexes depends on the basicity of the triarylphosphine trans to PnBu3 as this factor controls, inter alia, the rate of formation of hydride(acetate), Ru(CO)2(H)(OAc)(PnBu3)[P(p-XC6 H4)3], or dihydride, Ru(CO)2(H)2(PnBu3)[(p-XC 6H4)3], complexes, by hydrogenation of the bis(OAc) precursors. The catalytic hydrogenation of the C{double bond, long}C double bond is best accomplished by homodiphosphine dihydride catalysts, while heterodiphosphine monohydrides are more efficient catalysts than the homo- and heterodiphosphine dihydrides for the reduction of the keto C{double bond, long}O bond.
Mononuclear ruthenium complexes containing two different phosphines in trans position: I. Synthesis and spectroscopic characterization
Micoli,Salvi,Salvini,Frediani,Giannelli
, p. 4867 - 4877 (2007/10/03)
New mononuclear ruthenium complexes Ru(CO)2(Y)(Y′)(P nBu3)[P(p-XC6H4)3] (Y, Y′ = H, CH3COO; X = CH3O, CH3, H, F, Cl), all containing a PnBu3 in trans position to a triarylphosphinic ligand differently substituted in the para position, were synthesized. These ligands were chosen in order to change the basicity of the phosphine in trans to the PnBu3, without relevant steric changes. Spectroscopic data of the new complexes were correlated with the basicity of the triarylphosphines or with the mesomer effect of the substituent in the para position of the aromatic ring. The presence of two different phosphines into a mononuclear ruthenium complex seems an interesting model to study the trans effect for octahedral species.
