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Synthesis and NMR properties of dihydrogen-hydride complexes of rhodium and iridium
Addition of one equiv. of a tertiary phosphine ligand to toluene solutions of TpM(C$\sb2$H$\sb4)\sb2$ (Tp = hydridotris(1-pyrazolyl)borate; M = Rh, Ir) yields trigonal bipyramidal TPM(PR$\sb3$)(C$\sb2$H$\sb4$) complexes in which the phosphine ligand occupies the axial site and the ethylene ligand lies in the equatorial plane. ...