Abstract
Chromium(III) complexes {NNZ}CrCl2(THF) (2a-d) (NNZ=pyrazolyl-imine-phenoxy/pyrrolide) have been synthesized and characterized by elemental analysis and X-ray diffraction analysis. Upon activation with methylaluminoxane (MAO), chromium precatalysts 2a-b showed moderate activity in ethylene oligomerization (TOF=10.9 and 14.5×103(mol ethylene)(mol Cr)−1·h−1 at 80°C, respectively), producing mostly oligomers (78.4–85.7wt% of total products). On the other hand, under identical oligomerization conditions, 2c-d/MAO behaved as a polymerization catalysts generating predominantly polyethylene (76.6 and 86.1wt% of the total amount of products, respectively). Under optimized conditions, precatalyst 2a led to TOF=71,500mol(C2H4)⋅(mol(Cr)−1h−1 and 95.6wt% of oligomers.
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