J. P. Visser

Platinum(0) complexes of cyclopropenes

Abstract Cyclopropene and its 3-methyl, 3,3-dimethyl, 1,2-dimethyl, 1,3,3-trimethyl and 1,2,3-trimethyl derivatives have been coordinated to platinum by replacement of ethylene in Pt(C2H4)(PPh3)2. The complexes have been identified by NMR spectroscopy and X-ray analysis.

Interaction of platinum(0) with cyclopropenones

Abstract Platinum(0) can be inserted into a carboncarbon single bond of cyclopropenones.

The formation of allenes via PdII and PtII complexes

Abstract 4-Methoxy-1,2-butadiene has been prepared from chloroprene via a 2-chloro-π-allylpalladium complex. Attempts to synthesize a similar platinum complex from 2-chloroallyl chloride led to insertion of the metal into the vinylic carbon-chlorine bond.

Interaction of thiirene 1,1-dioxides with transition metal complexes

Abstract The decomposition of thiirene 1,1-dioxides into sulphur dioxide and the corresponding acetylenes is catalysed by certain transition metal complexes [Pd 0 Pt 0 and Ir 1 ]. The metal complexes of the substrate are key intermediates in the decomposition. A possible pathway is suggested.

Bi-heterometallic hydrido transfer between iridium and platinum

Abstract Hydrido transfer from IrH5L2 to Pt2Cl4L2 or Pd2Cl4L2 (where L = PPr3) occurs readily at room temperature, and in the case of the platinum dimer is shown to proceed via a hydrido-bridged platinumiridium complex.

Disproportionation of a halogen-bridged complex containing platinum and palladium

31 P N.m.r. spectroscopy shows that complexes of the type [PdPtCl4LaLb][Laand Lb are either the same or different tertiary-phosphide ligands (PPr3 or Pbu3)] are formed in chloroform solution when equimolar amounts of [Pd2Cl4(La)2] and [Pt2Cl4(Lb)2] are mixed at room temperature. All three complexes are in dynamic equilibrium, and a kinetic study indicates that the exchange occurs via a tetrameric intermediate involving four metal centres. Attempts to isolate the mixed metal complexes have proved unsuccessful. The first measurement of platinum–platinum coupling constants is reported for the complexes [Pt2Cl4(PBu3)2] and [Pt2I4(Pbu3)2].

Inorganic disproportionation. A 31P nuclear magnetic resonance study of a bi-hetero-metallic system containing platinum and palladium

31 P N.m.r. spectra show that on mixing chloroform solutions of [Pt2Cl4(PBu3)2] and [Pd2Cl4(PBu3)2] bi-hetero-metallic complexes of type [PdPtCl4(PBu3)2] are formed; the three complexes are in dynamic equilibrium and a kinetic study indicates that the exchange occurs via a tetrameric intermediate involving four metal centres.