Preparation and characterization of the first pyrazole-based remote N-heterocyclic carbene complexes of palladium(II)

The first pyrazolin-4-ylidene complexes of palladium(II) have been synthesized by oxidative addition of 4-iodopyrazolium salts to Pd-2(dba)(3)/PPh3 and were fully characterized by multinuclear NMR spectroscopies, ESI mass spectrometry and X-ray diffraction studies.