Platinum complexes of malonate-derived monodentate phosphines and their application in the highly chemo- and regioselective hydroformylation of styrene

Novel PtCl2L2 type complexes (where L = 2-diphenylphosphino-malonate derivatives) were prepared and used andas catalytic precursors for the hydroformylation of styrene. High regioselectivities towards branched aldehyde were obtained with all platinum-phosphine-tin(II) chloride catalytic systems. It has been revealed by 31P NMR spectroscopy that the ratio of the cis/trans complexes is strongly dependent on the structure of the ligand.