Synthesis, Reactivity and Crystal Structures of the Palladium(II) Complexes with the Pyrimidine Containing Ligand: Crystal Structures of [Pd(PPh 3 )(η 1 ‐C 4 H 3 N 2 )(η 2 ‐S 2 CNC 4 H 8 )] and [Pd(PPh 3 )(η 1 ‐C 4 H 3 N 2 )(η 2 ‐Tp)]

Treatment of Pd(PPh 3 ) 4 with 5‐bromo‐pyrimidine [C 4 H 3 N 2 Br] in dichloromethane at ambient temperature cause the oxidative addition reaction to produce the palladium complex [Pd(PPh 3 ) 2 (η 1 ‐C 4 H 3 N 2 )(Br)], 1 , by substituting two triphenylphosphine ligands. In acetonitrile solution of 1 in refluxing temperature for 1 day, it do not undergo displacement of the triphenylphosphine ligand to form the dipalladium complex [Pd(PPh 3 )Br] 2 {μ,η 2 ‐(η 1 ‐C 4 H 3 N 2 )} 2 , or bromide ligand to form chelating pyrimidine complex [Pd(PPh 3 ) 2 (η 2 ‐C 4 H 3 N 2 )]Br. Complex 1 reacted with bidentate ligand, NH 4 S 2 CNC 4 H 8 , and tridentate ligand, KTp {Tp = tris(pyrazoyl‐1‐yl)borate}, to obtain the η 2 ‐dithiocarbamate η 1 ‐pyrimidine complex [Pd(PPh 3 )(η 1 ‐C 4 H 3 N 2 )(η 2 ‐S 2 CNC 4 H 8 )], 4 and η 2 ‐Tp η 1 ‐pyrimidine complex [Pd(PPh 3 )(η 1 ‐C 4 H 3 N 2 )(η 2 ‐Tp)], 5 , respectively. Complexes 4 and 5 are characterized by X‐ray diffraction analyses.