Reactions of low-valent metal complexes with fluorocarbons. Part XXIX. Zerovalent nickel and platinum complexes with hexafluorobut-2-yne and hexakis(trifluoromethyl)benzene

Abstract

Reaction of [Pt(trans-stilbene)(PEt₃)₂] with C₆(CF₃)₆ affords a complex [Pt{C₆(CF₃)₆}(PEt₃)₂], shown by variable temperature ¹⁹F n.m.r. spectroscopy to be a fluxional molecule. Treatment of the related nickel complexes [Ni{C₆(CF₃)₆}L₂](L = AsMe₂Ph or P(OMe)₃) with an excess of CF₃CCCF₃ yields a new kind of complex: a hexakis(trifluoromethyl)nickelacyclohepta-cis,trans,cis-triene. Reaction of [Pt{C₂(CF₃)₂}(PEt₃)₂] with excess of hexafluorobut-2-yne proceeds more slowly to afford a monophosphine substituted hexakis(trifluoromethyl)platinacyclohepta-cis,trans,cis-triene, which with Ph₂PCH₂CH₂PPh₂ gives a complex isostructural with the nickel systems.