Tin(IV) halide promoted vinyl rearrangement of hexafluorobuta-1,3-diene–platinum complexes

Abstract

The major products of reactions of stilbenebis(triphenylphosphine)platinum or tetrakis(triphenylarsine)platinum with hexafluorobuta-1,3-diene are complexes in which one double bond of the diene is co-ordinated to the metal, viz. [graphic omitted]·CF:CF₂(L₂)[L = PPh₃ or AsPh₃]. The arsenic compound reacts with diphenylmethylphosphine to give [graphic omitted]·CF:CF₂(PPh₂Me)₂. Reactions of these hexafluorobutadiene complexes with stannic chloride or bromide in benzene afford the complexes trans-Pt(X)(CF:CFCF:CF₂)L₂(X = Cl; L = PPh₃, PPh₂Me, AsPh₃; X = Br; L = PPh₃, PPh₂Me). The ¹⁹F n.m.r. spectra of the new compounds are described, and the mechanistic implication of the stereochemistry of the products discussed.