Synthesis, characterization, and ethylene polymerization behavior of [(RR′-admpzp)2Ti(OPri)2] complexes (RR′-admpzp = 1-dialkylamino-3-(3,5-dimethyl-pyrazol-1-yl)-propan-2-olate)

[(RR′-admpzp)2Ti(OPri)2] (2a-c) are pseudo-octahedral complexes that contain RR′-admpzp ligand κ2-O,N(pyrazolyl)-coordinated to the titanium center. In solution, 2a-c adopt isomeric structures that are in dynamic equilibrium. At 23 °C, 2a-c/1000 MAO catalyst systems furnished high molecular weight polyethylene with narrow molecular weight distributions (Mw/Mn = 2.7-2.8). At 100 °C, 2a-c/MAO exhibit increased polymerization activity at 100 °C and 2c/1000 MAO produced polyethylene with molecular weight distribution (Mw/Mn = 2.1) close to that found for single-site catalysts.