Gravar-mail: Syntheses, Reactivities, Characterization, and Crystal Structures of Dipalladium Complexes Containing the 1,3-pyrimidinyl Ligand: Structures of [Pd(PPh(3))(Br)](2)(μ,η(2)-C(4)H(3)N(2))(2), [Pd(Br)](2)(μ,η(2)-Hdppa)(2), and [{Pd(PPh(3))(CH(3)CN)}(2)(μ,η(2)-C(4)H(3)N(2))(2)][BF(4)](2)