Experimental study of the [ZnCl2(THF)2] catalyzed cis/trans-isomerization of [Pd(C6Cl2F3)Me(PPh3)2] and of the transmetalation of trans-[PdCl(C6Cl2F3)(PPh3)2] with [ZnMeCl(THF)2]

The kinetics of the transmetalation reaction between trans-[PdCl(C6Cl2F3)(PPh3)2] and [ZnMeCl(THF)2] shows a complex dependence on [PPh3] for rate formation different products: cis trans-[Pd(C6Cl2F3)Me(PPh3)2], trans-[PdClMe(PPh3)] (which further reacts with [ZnClMe(THF)2]), [Zn(C6Cl2F3)Cl(THF)2]. To better understand system reactions trans-[Pd(C6Cl2F3)Me(PPh3)2] [ZnCl2(THF)2] (the retro-transmetalation reactions) their kinetic were studied. These lead to [Zn(C6Cl2F3)Cl(THF)2] as main products. Additionally, experiments show that isomerization is catalyzed by [ZnCl2(THF)2]. In this concentration PPh3 involved in two ways: It modulates organozinc [Zn(C6Cl2F3)Cl(THF)2], also it shifts ligand substitution equilibrium palladium complex, producing an anomalous triphenylphosphine.