A Zwitterionic Palladium(II) η3-Boratoxypentadienyl Complex: Cooperative Activation of Dibenzylideneacetone between Palladium and a Phosphine/Thioether/Borane Ligand

A free phosphine/thioether/borane ligand (5) suitable to position a Lewis acidic borane in close proximity to a coordinated late transition metal has been prepared. Reaction with 0.5 [Pd2(dba)3] gave a zwitterionic palladium(II) η3-boratoxypentadienyl complex with the empirical formula [Pd(dba)(5)].