Hydroformylation of styrene in the presence of platinum(II) complex catalysts incorporating cyclic phosphines and phosphonous diesters as P-ligands

► P-heterocycles proved to be excellent ligands in platinum-catalysed styrene hydroformylation. ► Good aldehyde selectivities were obtained with tetrahydrophosphinine derivatives. ► High branched selectivities were obtained with chelating diphosphines. ► The influence of the 4-substitution of the parent styrene on selectivities was investigated.