Oxidative addition of triarylcyclopropenium bromides to Pd0 and Pt0 compounds: the synthesis and X-ray structure of Pd3{µ-[η3-C3(Ph)(p-MeOC6H4)2]2}(acac)2](Pd–Pd–Pd)

Abstract

Dibenzylideneacetone (dba)–palladium(0) and –platinum(0) complexes [M₂(dba)₃]solv. react with triarylcyclopropenium bromides to give the ring-opened trinuclear complexes, [M₃(C₃R₃)₂Br₂]; the pentanedionatoderivative of one, [Pd₃{C₃Ph(p-MeOC₆H₄)₂}(acac)₂], has been shown by X-ray crystallography to have a bent Pd–Pd–Pd skeleton with η³-C₃R₃ ligands bridging each pair of palladium atoms such that the C₃ plane intersects the Pd–Pd bond.