Abstract
Neutral complexes of the formula PtCl 2L 2 (where L = diethyl 2-diphenylphosphino-malonate ( 1), diethyl 2-methyl-2-diphenylphosphinomalonate ( 2), dibenzyl 2-diphenylphosphinomalonate ( 3), 1,3-dihydroxy-2-methyl-2-diphenylphosphinopropane ( 4)) were prepared. These proved to be precursors to active catalysts for the hydroformylation of styrene. The platinum-containing catalytic systems prepared from ligand 4 provided the highest activity, while the platinum compounds prepared from other ligands all showed similar levels of reactivity to each other. The matching of high chemo- and regioselectivities were observed in most cases. Surprisingly, the complexes were practically inactive in imidazolium-type ionic liquids. 31P NMR studies on the PtCl 2L 2 complexes revealed that the stereoselectivity of the cis/ trans geometrical isomers is strongly dependent on the structure of the ligand.
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