Synthesis and decomposition of neutral palladium(IV) complexes containing fac-PdMe2R groups, including reductive elimination by η1-propenylpalladium(IV) complexes to form η3-propenylpalladium(II) species

Article abstract of DOI:10.1016/0022-328X(90)85108-B

Oxidative addition of ethyl iodide to PdMe2(2,2'-bipyridyl) in (CD3)2CO gives the unstable PdIMe2Et(bpy) , which undergoes reductive elimination to form PdIR(bpy) (R = Me, Et), ethane, and propane.Ethene and palldium metal are also formed, and are attributed to decomposition of PdIEt(bpy) via β-elimination.Similar results are obtained with n-propyl iodide, although a palladium(IV) intermediate was not detected, but CH2=CHCH2X (X = Br, I) and PhCH=CHCH2Br give isolable complexes fac-PdXMe2(CH2CH=CHR)(L2) ( R = H, Ph; L2 = bpy, phen).The propenyl complexes decompose at ambient temperature to form ethane, a trace of PdXMe(L2), and mixtures of 3-C3H5)(L2)>X and 3-C3H5)(L2)>3-C3H5)X2>; for fac-PdBrMe2(CH2CH=CH2)(bpy) the major palladium(II) product is 3-C3H5)(bpy)>Br.