Synthesis and structure of platinum and palladium complexes of dimesitylphosphine

Article abstract of DOI:10.1016/S0277-5387(02)01184-1

Treatment of Pd(tmeda)Me₂ with dimesitylphosphine (PMes₂H, L) gave cis-PdL₂Me₂ (1). trans-ML₂Cl₂ (M = Pd (2), Pt (3)) were prepared from a variety of starting materials. The reaction of Pt(cod)Cl₂ with L gave cis-PtL₂Cl₂ (4), which reacted with PPh₃ to yield cis-Pt(L)(PPh₃)Cl₂ (5). cis-PtL₂(Me)(Cl) (6) was prepared from L and Pt(cod)(Me)(Cl), while reaction of L with Pt(cod)(Et)(I) gave cis-PtL₂(Et)(I) (7), which isomerized to trans-PtL₂(Et)(I) (8). The phosphine-borane PMes₂H·BH₃ (9) was made by reaction of L with BH₃·SMe₂. Crystal structures of 2·2CH₂Cl₂, 4·CH₂Cl₂, 5·2CH₂Cl₂, 6, and 9 provided 7information on the steric bulk of L (cone angle ca. 149°). Restricted rotation about the Pt-P and P-C bonds in complexes 4-8 was studied by variable temperature NMR spectroscopy.