Benzenedicarbonyl and benzenetricarbonyl linker pyrazolyl complexes of palladium(ii): synthesis, X-ray structures and evaluation as ethylene polymerisation catalysts†
Abstract
A series of novel compounds with pyrazolyl rings (pz) linked by benzenedicarbonyl (L1–L4) and benzenetricarbonyl (L5, L6) have been prepared and structurally characterized. The mutual orientation of their rings was studied by molecular mechanics. These polydentate species react with PdCl2(NCMe)2 to yield dinuclear complexes in which the Pd centers coordinate to one or two pz units, a terminal chloride and two bridging chloride