Reinvestigation of the reactions of carbonylhydridotris(phosphine) complexes of rhodium and iridium with sulphur dioxide

Abstract

The reactions of SO₂ with [RhH(CO)(PPh₃)₃] and [IrH(CO)(PPh₃)₃] have been reinvestigated and the products have been shown to be the hydrido(sulphur dioxide) complexes [MH(CO)(SO₂)(PPh₃)₂], where M = Rh or Ir, on the basis of ¹H and ^3lP-{^lH} n.m.r. studies. In the case of the iridium complex, n.m.r. studies at low-temperatures have indicated the intermediate formation of the six-co-ordinate hydrido(sulphur dioxide) complex, [IrH(CO)(SO₂)(PPh₃)₃].