New synthetic methods for organometallic ketonyl derivatives of the type [PtCl{h1-CH2C(O)R}(N-N)] starting from the Zeise’s salt

The reactivity of the Zeise’s anion with bidentate dinitrogen ligands (N-N) has been the main subject of several studies on the Pt(II) coordination and organometallic chemistry. The chemistry of Pt(II) organometallic ketonyl derivatives it is recognized to be important for many potential applications. For these reasons we exploit the possible extension of Zeise’s anion reactivity, in basic media, to the general synthesis, of organometallic ketonyl derivatives of the type [PtCl{h1-CH2C(O)R}(N-N)], even in the case of aliphatic diamines and sterically hindered diimine ligands. In these conditions we observed the formation of methastable intermediate complexes of the type trans-[PtCl2{h1-CH2C(O)R}(h2-C2H4)]-. Further reaction with dinitrogen ligands (N-N) gives [PtCl{h1-CH2C(O)R}(N-N)] complexes. In particular this new simple pathway results interesting from the synthetic point of view for the possibility to synthesize ketonyl complexes with several ketones and dinitrogen ligands not suitable for other methods.