Synthesis of new (σ 2- N, N′-diazadiene)(η 2-alkene)platinum(0) compounds

Abstract

Novel, thermally stable, dark-red to orange Pt 0(σ 2- N, N′-diazadiene)(η 2-alkene) compounds have been synthesized in good yields from Pt 0(COD) 2 or Pt 0(NBE) 3, by stepwise substitution of the respective dienes or alkenes by an electron-poor alkene (dimethyl fumarate, maleic anhydride or fumaronitrile), followed by the appropriate diazadiene ligand in dry diethyl ether at 20 °C (diazadiene=various N, N′-disubstitued-1,4-diaza-1,3-dienes). The complex Pt(DBA) 2 is less suited as a precursor for the synthesis of Pt 0(σ 2- N, N′-diazadiene)(η 2-alkene) compounds. These zerovalent Pt(diazadiene)(η 2-alkene) compounds constitute a useful category of starting materials for synthetic organoplatinum chemistry and catalysis.