SUBSTITUTION-REACTIONS OF (DIPHOSPHINE)PALLADIUM(II) AND PLATINUM(II) CHLORIDE AND TRIFLATE COMPLEXES

The triflate complexes [Pd(OTf)2L2] (L2 = dppm, dppe, dppp) and [Pt(OTf)2(dppp)] are prepared by reaction of the corresponding chloride with methyl triflate. The chloropalladium complexes [PdCl2L2] do not react with PPh3, but with PBu3 substitution of one chloride takes place, whereas [PtCl2(dppp)] reacts with either PPh3 or PBu3. The triflate complexes [M(OTf)2L2] (M = Pd, Pt; L2 = dppm, dppe, dppp) react with either PPh3 or PBu3 by substitution of one or both triflate ligands, although in CDCl3 the system is complicated by reaction with the solvent. [Pt(cod)(dppp)][OTf]2 reacts with PPh3 or PBu3 by attack of the phosphine on one of the double bonds of cyclooctadiene.