Coordination Chemistry of Perhalogenated Cyclopentadienes and Alkynes, XXIX. The Reaction of Ni(0) and Pt(0) Phosphane Complexes with Trichloroethene, Hexachloro- and Hexabromocyclopentadiene

Abstract

Trichloroethene reacts with [Pt(PPh3)2(C2H4)] at first π to the complex [Pt(PPh3)2(η2-C2HCl3)] (1a), which isomerizes via the cis-isomer to the insoluble trans-[Pt(Cl)(η1-CH=CCl2)(PPh3)2] (2a). Both 1a and 2a react with PBu3 to the corresponding tributylphosphane complexes 1b and 2b, respectively. From the reactions of [Ni(PR3)2(C2H4)] (R = Me, Et, Bu) and C2HCl3 only the products of oxidative addition trans-[Ni(Cl)(η1-CH=CCl2)(PR3)2] (3a - c) can be isolated. Hexachlorocyclopentadiene and hexabromocyclopentadiene react with [Pt(PPh3)2(C2H4)] or [Ni(PR3)2(C2H4)] (R = Ph, Me) to give highly colored solutions.